iron content in the slate which is following a similar reactive path. hi, what is the difference between canadian roofing slates and welsh slates . sunlight. From replacement roofs to new construction, our patented roofing system eliminates roughly 40% of materials needed in a traditional installation. We've heard several explanations for the mechanism by which Pennsylvania In fact, S1 slate has all the best physical characteristics of the highest quality roofing material in general worldwide. However as long as the slates are physically intact the across the slate rather than from edges in. - slateassociation.org. As well as being an impermeable moisture barrier, natural S1 grade roofing slate is also highly resistant to UV light, wind, rain, hail, snow and more. Virginia slates: 175 years or more. And, our impressive warranties give you additional peace of mind that your most treasured asset is protected for a lifetime. Vermont slate roofs, with proper maintenance, can last indefinitely. color, or in other variations. We do not know the origin of this particular slate, but it's wear condition and age indicate a durable roof. rather than showing up as a splotch, or a ring of white around darker on a building in 1991. Some of the oldest homes in the nation sport slate tiles on their roofs. The life expectancy of natural slate varies enormously from 70-100 years, depending on the quality of the slate. experience, from opinions shared at ASHI and other education seminars, The correct replacement slate is then slid into place and secured with a steel hook or clip (conventional roof system). damage to the slates. We also provide a MASTER INDEX to this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. Lime and other mineral salts are Even today, slate remains the premier choice for those who want the best. Ms. Puentes can be contacted at, Our recommended books about building & mechanical systems design, inspection, problem diagnosis, and repair, and about indoor environment and IAQ testing, diagnosis, and cleanup are at the. the mechanism of slate deterioration. A well installed slate roof will last a century or more. 143 Forest Lane, PO Box 607, Grove City, PA 16127 - 866-641-7141 (We recommend this book). ISBN-10: 1405161035 This is not as good as some materials like real slate, but it is better than typical shingles which are about 20-30 years. fade from weather exposure. As long as the slate installation is performed by a reputable roofing contractor with experience. Installed correctly, a new roof will last at least 15 years, but the exact lifespan depends on the material. Longevity: Slate roof tiles have a life-span between 100-200 years. It is interesting to note that several expectancies are general experience with the material and do not consider installation or environmental factors which vary rate the apparent wear age of the roof, not the actual Slate from different mines has different average slate roof life expectancies (with proper installation and regular maintenance): Vermont and New York slates: 125 to 175 years. This series of detailed slate roof inspection and repair articles describes procedures for evaluating the condition of slate roofing. The aluminium foil strip must face upward on the lower half of the slatex.The slatex 2000 is then nailed, with large headed copper clout nails, through the unprotected felt, onto a batten. Even with all the modern roofing materials out there, slate has retained its position near the head of the pack. According to a study performed by the National Association of Home Builders (NAHB), a trade association that helps promote and represent the policies of the U.S. housin g industry, the lifespan of tile roofs far exceeds that of any other roofing material. One of the factors that deters many homeowners from installing a slate roof is the high cost of materials and labor. The damaged slate is then removed by pulling out the nails with a ripper. at Vermont Structural Slate Co. We also paraphrased from a presentation A slate that’s graded S2 or S3, is far less suited as a long-term roofing solution compared to S1, and is often sold at a far cheaper price. Inspectors who do not know the composition types of slate, common defects, inspection topics, and some repair did Mr. Trapasso, but on seeing how soft and delaminated this slate can become, we can understand his loose use of that term. Starting at the lowest point of the slope, roll slatex 2000 out across the roof parallel to the eaves. Click here to tell us about your project. inspection reports. tips. With experience from 1954 we strive to give the best service and workmanship in the roofing industry possible. Roofing Slate Life Depends on From Where Slates were Quarried, as we desribe below. Some ribbon slates whose ribbons or lines of color through the slate demonstrate color lines comprised of soft minerals, sometimes even with small voids, often of a red or rust-brown color. and exposed. roof is serviceable. It was reserved for high end buildings usually in big cities in the 1600 and 1700s, but once slate became available locally the costs came down and it began showing up in more places. As a result, geologist emphasizes natural slate durability to last over a century. Their unfading black slate is currently produced for the European and North American market and is marketed in North America as North Country Unfading Black. explanation of deterioration. Earlier British experimentation on slate durability and composition emphasized that variations in the tendency of slates to absorb water The Old House Journal, April 1983, p.58, and Slate Roofs, and at end of life on close inspection. edges-in whitening (efflorescence) and fading. Prior to the opening of the first commercial slate quarry in America in 1785 in Pennsylvania all slate was imported from North Wales in the UK. the same, is esteemed the best, which imbibes the least water; for the imbibed water not only increases the weight of the covering, but, Slate roofing was once the material of choice for high-value roofs. Its durability, which sets it apart from other slates, is derived from its density and the geological formation found in that part of North Wales. Click here to tell us about your project. But other ribbon slates, also found in the Northeastern U.S. as well as in other areas, prove to be as durable as other high quality roofing slates, with lifetimes from 20 to 80 years, perhaps even longer. Slate's unparalleled lifespan as a roofing material is an attractive benefit, of course, but claims that it increases home value or that, as an investment, it yields you a measurable return over the life of the roof are frequently overstated. we observe that while oxides of silica (SIO2) in color and scaling you should consider the slate to be at the end The added bonus that slate provides is a longevity that most other roof materials cannot compete with. As the railroads spread so did the proliferation of slate roofs and by the 1870s the US had become a ne… Because steel nails are used in South Africa, adjacent slates get damaged and displaced in the ripping process, and these, too, will have to be replaced. Slate roofs were introduced in Boston as early as 1654 and Philadelphia in 1699. By the 1920's this slate was calcium oxide (CaO) and other carbonates and oxides. This simple combination of our interlayment system and genuine materials makes for a roof that is easy to install, lighter weight, and cost-effective. Don’t settle for anything but the best when it comes to your home. age. SLATE ROOFS - CHEAPEST OF ALL. The photographs provided here show how soft roofing slates can become. The white visible in Pennsylvania slate is evidence of efflorescence For starters, you need to consider slate roof life expectancy in relation to the age of the house. ©2020 Genuine Roof Systems. This blend of quality and aesthetics, as well as the large format sizes available, makes Welsh Slate roofing slate much desired for heritage and prestigious projects including Buckingham Palace, Number 10 Downing Street and St Pancras and King’s Cross Stations. The reason for such a wide pricing range is that installation/labor costs can vary widely from installer to installer. Natural Stone is the ultimate eco-friendly, durable, and beautiful roofing material. references indicate that slates actually harden after being quarried we did not find references to brown in Virginia slates. Signs of slate roof wear & deterioration from close-up inspection allows one to assess remaining roof life: the abandonment of good slate roofs which should have been repaired mineral salts as thick as that left by efflorescence. This article series reviews In our experience, in the Northeastern U.S. where these slates were found, often these were a low-priced and short-lived roofing slate. The first production from this vein of slate occurred in the early 1900s. markedly are classed as "weathering". Longest lasting roofing material. white faded patches resulting from exposure to sunlight and moisture. Slate is a fine-grained, foliated, homogeneous metamorphic rock derived from an original shale-type sedimentary rock composed of clay or volcanic ash through low-grade regional metamorphism.It is the finest grained foliated metamorphic rock. Monotonically means that the color change is even across the material slates will not show an obvious whitish powder of surface deposited British geologist J.A. damage also affect slate life. Vermont slates as having a 175 year life. roof you should ask to be shown examples of failed slates. The Slate Roof Bible, Joseph Jenkins, www.jenkinsslate.com, The white areas generally begin at the three exposed sides of a slate, The purple slate is very similar in color to Welsh Purple from England. The life expectancy of a slate roof is estimated to be anywhere from 75 years to 150+ years. Van Nostrand Reinhold Company, NY 1981 ISBN 0-442-2135-3 Library of This red slate, probably from the Granville NY quarry, was also wet through to the touch. Historic Preservation Technology: A Primer, Robert A. Unlike tiled roof systems like stone slate, clay tiles, concrete tiles, etc. These photographs make clear that it can be tough to accurately evaluate the condition of some slate roofs from ground level - a close-up inspection is needed to distinguish between the slate roofs in our photos shown here. All rights reserved. We give attention to detail, delivering all our products according to the needs of our clients. Clearly there is more material available to form 3. Pennsylvania/ Maryland slates: 100 to 200 years. It’s no wonder that a material that took nature millions of years to create a deep underground, is one of the best building materials at standing up to nature itself. As you can read in more detail at RIBBON SLATE, there are two different sorts of ribbon slates, definitely from different quarries. Following application on a roof Natural slate roofs are well known to have a lifespan of hundreds of years with little to no maintenance. But while the upfront cost of installation is high, the cost per year over its lifespan is the lowest of all of its competitors. Additionally, you should learn about the right measures to take if issues arise with slate shingles during the time you own a property. We do not agree that we should call this "rotted roofing slate" as dissolved and deposited on the surface of the slate when moisture impurities and were recommended by the Slate Association only for Slate Roof Central - How To Identify Roof Slate. National Slate Association, p. 71. Slate Roofing Requires Different Fasteners — Slate nails are entirely different from the fasteners used on asphalt shingles and metal roofs. John Cranor [Website: /www.house-whisperer.com ] is an ASHI member and a home inspector (The House Whisperer) is located in Glen Allen, VA 23060. - welshslate.com. On a different home in the same city, the mansard style slate roof shown below right employs a mix of ribbon slates, some of which were quite worn and appeared to be at the end of their life. exposure. The first is or really past end of roof life and the second slate roof has good life remaining. Average life of these slates is 175 years. Examining quantitative analysis of slates from nineteen quarries Slate Roofing Pretoria . With proper maintenance such an asset may be continued Slates may look fine from the ground, but be found soft If a roofer recommends tearing off the whole By direct inspection we mean looking at slates Long lifespan of 100 years or more – With proper care, it’s not unheard of for a slate roof to last at least 100 years, and some roofs can last 150 years with proper installation. Carbon, which In my second "rotted slate" photo below, I'm demonstrating that my weak puny thumb and forefinger are engough to smush this red slate into mud. surface the slate material is exposed to ultraviolet rays (sunlight) Steven Trapasso, personal communication. He is also a contributor to InspectApedia.com in several technical areas such as plumbing and appliances (dryer vents). Here, learn which roofing lasts the longest. After a detailed research, Walsh exposed natural slate (including CUPA 3) to different weather conditions. For Edco roofing slates sold in Canada the product includes a 50 year warranty. For fibre cement roof slates, the life expectancy is a little shorter at around 50-60 years. Our design team can accommodate any custom or standard roofing project and help you choose from the many slate colors and textures to build the perfect roof for your home. "That sort of slate", said Dr. Watson, the bishop of Llandaff, "other circumstances being ISBN-10: 0471788368 The National Slate Association reference does not detail Site conditions, such as the roof pitch, exposure to An independent UK study of different roofing materials revealed that if the cost of a roof is amortised over its expected life, slate roofs (with a capacity to last 100 years) were the cheapest of all. Worn slates at end of life, lost slates, delaminated slates, broken slates on this small roof make re-roofing necessary Worn out slates and sliding slates, on a slate roof beyond economical repair. slates deteriorate, of which the most interesting was the opinion The extent of color change in Pennsylvania [and possibly other] slates Energy Efficient. Posted on September 4, 2020 October 6, 2020 by Brava Roof Tile. , 1981. Reduces humidity levels; Slate Roof Waterproofing seals and protects the infrastructure from water leakage. Information or other documentation. high-quality material which, properly maintained, can have a near indefinite life. Asphalt roll roofing is made from large rolls of the same material used in asphalt … Contact Mr. Cranor at 804-873-8534 or by Email: Building Pathology, Deterioration, Diagnostics, and Intervention, Samuel Y. Harris, P.E., AIA, Esq., ISBN 0-471-33172-4, John Wiley & Sons, 2001 [General building science-DF] ISBN-10: 0471331724 Deteriorating Pennsylvania slate shows a mottled appearance, with a clear love affair with the material, particularly when it comes ISBN-13: 978-1405161039, Built-Up Roof Systems, Manual, C.W. Above, the ribbon-slate roof in Poughkeepsie, New York was about eighty years old when we took the photo in the 1980s. from the authors' personal, limited experience repairing and rebuilding growing towards the center of the slate as a function of time and Slate Roof Lifespan Natural slate roofs are well known to have a lifespan of hundreds of years with little to no maintenance. Mr. Trapasso has 40 years experience in working with slate, and has Vermont (.3%-.7%). Often you’ll find simulated slate tiles used to repair damaged slate tiles. We have no relationship with advertisers, products, or services discussed at this website. It is worth distinguishing between mechanical damage (repairable) and wear factors that mean the slate roof is at the end of its life or perhaps beyond economical repair. temporary buildings or for chalkboards. Watson's comments pertain to use of slate in Britain. roof on the Saxon Chapel at Stratford-on-Avon was built 1100 years Production of roofing slate from this quarry has been intermittent since the early 1900s. By contrast to the This means that nothing will compromise slates structural integrity over time. Increases the value of your home. InspectAPedia tolerates no conflicts of interest. A slate rating or grade can tell you a lot about what kind of lifespan you can expect from the stone over time. Watson continued to suggest that slates, being less porous than clay roofing tiles of the day, were more durable. Typically artificial slate roof life expectancy varies between 20 - 60 years. opinions in Handbook of Building Crafts in Conservation On the other hand, even with proper maintenance, wood-shake, asphalt shingle, and concrete tile roofs are known to last only 20 […] that lime in the slates in the presence of moisture reacts to break ago - still in good condition. efflorescence process, fading slates generally fade monotonically AD That’s the type on top of my 1946 house, so I am in the market for a new slate roof. 6.Life Expectancy: Rubber shingles have a pretty good lifespan of about 50 years. Those which change more Roof Tiling & Slating, a Practical Guide, Kevin Taylor, Crowood Press (2008), ISBN 978-1847970237. The slates in our photo (left) may look questionable from the ground but a closeup inspection may show, as this one did, that the slate body is still thick and hard, and it is surface delamination of the slate that was visible from the ground. Rubber shingles or Rubber slate is … Asphalt Roll Roof. from a few inches, either from a ladder or some other point of view such as an attic window. You will have an additional layer of protection against decay, wear, and leaks. recognized as not as durable; you'd not expect to find it surviving Indeed unglazed clay absorbs more water (up to 10%) than slate (usually 1%) but tiles are not necessarily damaged by these freeze-thaw conditions. Softer slates, especially those once quarried in parts of Pennsylvania, have a life span of 75 to 90 years. Natural slate is the most durable roofing material. Problems with slate roofs is that tiles may be difficult to match in color and thickness. By other sources, Vermont slates have life expectancy of 100-200 years. We also provide slate sources and where to buy slate roofing materials and slate roofing tools and products. Faded calcium carbonates and efflorescence in the shorter lived materials. , ISBN-13: 978-0764330018, Problems in Roofing Design, B. Harrison McCampbell, Butterworth Heineman, 1991 ISBN 0-7506-9162-X (available used), Roofing The Right Way, Steven Bolt, McGraw-Hill Professional; 3rd Ed (1996), ISBN-10: 0070066507, ISBN-13: 978-0070066502. Slates with these ribbons have the shortest service life - about 75 to 90 years. Many old churches and castles made use of slate as the primary roof material, as it was the best thing available at the time. There are slate roofs today, still functioning, that are multiple centuries old. Stone, being inorganic, does not truly "rot". Handbook of Building Crafts in Conservation, Jack Bower, Ed., We'd presume that observation pertains to the early or Finally, when comparing slate properties it is worth remembering the location of the slate quarry and considering the shipping costs of alternative slates. These slates might, from a distance, look pretty good, but of circumstances, a Vermont slate roof. Slates which are soft, delaminating, and thus are at or near end of their Or see SLATE ROOF DEFECTS where we describe a variety of problems and leak points on slate roofs that are not necessarily a function of the age or wear condition of the roof. Here are some close looks at roofing slate to reveal conditions you cannot detect from a ground-level inspection, even using binoculars. The known chronological age of slates may be available from an owner Welsh Slate roofing is commonly removed from roofs after 100 years not because they have failed but because the roof timbers holding them up have failed. Darker gray "Buckingham" slates from Virginia are considered a durable How to inspect, identify defects, and estimate remaining life of slate roofs are addressed. Note: appearance of your Comment below may be delayed: if your comment contains an image, web link, or text that looks to the software as if it might be a web link, your posting will appear after it has been approved by a moderator. There are slate roofs today, still functioning, that are multiple centuries old. Welsh roofing slate is described by welshslate.com which I quote as well, noting that this is also marketing literature mixed with useful facts: Natural slate from Welsh Slate’s Penrhyn, Ffestiniog and Cwt-y-Bugail quarries produces the finest roofing slates in the world. is a financial shame and the destruction of a valued asset. Also the Old House Journal April 1983 rates Canadian roofing slates are made from slate quarried in Quebec or possibly Newfoundland, and sold by a variety of companies. Such roofs should be maintained, not replaced. down organic components in the slate. No roofing contractor? These components cause the lime to break down the organic claimed some chemical or molecular process of permanent or continuing in this article is taken from the references shown below, from inspection S1 slate is totally impermeable to moisture penetration of any kind. However slate can deteriorate so as to become so soft and disintegrating that you won't blame a less-pedantic slate expert roofer from calling the slate material "rotten". in slates from only a few quarries, and then in usually small amounts Stone lasts a long time and your roof will last a long time as long as it was properly installed and repaired when needed. It is useful to contrast the above "soft crumbling roofing slate" with the surface delamination of the roofing slates shown at left. Archeological excavations at Jamestown, Virginia,have unearthed roofing slate in strata dating from 1625-1650 and 1640-1670. A slate tile roof adds instant curb appeal because it is beautiful and can only complement the architectural appeal of your home. Or use the SEARCH BOX found below to Ask a Question or Search InspectApedia. In contrast, most asphalt shingle roofs must be replaced every 15-30 years. Genuine Roof Systems offer natural sophistication. My third end-of-life slate photo shows the result: the slate is a handful of fragile chips and slivers. A poorly installed one is a lot like having no roof at all.” Slate roofing tiles are lot heavier than other roofing materials. Natural slate roofing that meets the S1 Grade through direct independent testing by the National Slate Association, is the highest grade slate possible and will have the longest lifespan of nearly any roofing material available. of Pennsylvania slate may be understood as a process similar to decomposition of less than 1%. Natural slate is basically a stone material, though it may contain some organic inclusions. By Mr. Trapasso's account the decomposition from one building to the next. 4) Pennsylvania black slate (below) from the Lehigh Northampton slate district tends to be the "soft" slate with a life expectancy of 75-125 years. On the other hand, even with proper maintenance, wood-shake, asphalt shingle, and concrete tile roofs are known to last only 20 or 30 years before needing to be completely replaced. Slate is a heavy product to ship, which may explain why in my opinion slate mined in North Wales in the U.K. is not likely to be found on many buildings in the U.S. or Canada. on slate roofs. Slate Roof (Slate Roof Tiles)– Advantages and Disadvantages. and causing the white efflorescence. often indicates the extent of deterioration. While roof covering are generically referred to as tiles (which are moulded), flat slates are often referred to as a ‘roofing tile’ by home owner. Vermont slate roofs, with proper maintenance, can last indefinitely. The slate above looks pretty good from a distance, though in the first photo as I've begun to push it up you can see some delamination. and source of slates would not want to condemn, except in the worst If the whole slate is white Continue reading at SLATE ROOF PATTERNS or select a topic from the closely-related articles below, or see the complete ARTICLE INDEX. The lime which was in the slate, when the slate was mined, we were easily able to crush the slates with my fingers. is in an inactive or dormant state. The Glendyne Quarry in St. Mark du Lac Long, Quebec, Canada, is the largest roofing-slate producing facility in North America and one of the largest in the world. Having your roof waterproofed reduces the risk of damage. A slate roof is a popular roofing choice for many self-builders and renovators because of its impressive service life, excellent durability and timeless appeal. Penrhyn slate, for example, was removed from St Asaph Cathedral after 400 years in use and reused and this practice also applies to civic buildings as far away as Australia. It does point out that the slate Overall, homes with slate roofing … same time, careless optimism about a bad slate roof which is at the Congress Catalog Card Nr. According to the National Slate Association, (quoting). SIGA 24 Slate Roof. of its life. materials in the slate (shale), making the slate increasingly porous It’s also no surprise that slate roofing has been one of the oldest and most time-tested forms of roofing worldwide for centuries. - lime deposited on the slate surface. Watson's opinion that slates are more durable than clay tiles is arguable as both materials are found with considerable variation in composition. Risks include falling - very slippery, and extensive for an indefinite period. No. The reason high-grade S1 roofing slate lasts so long is simple, it’s a naturally non-porous material, that perfectly splits into tile-sized pieces. initial state of use of the slates, and we found no reference which and moisture. may be the principal cause of deterioration seen by modern inspectors. Although slate quarrying was not common in the United States until the latter half of the nineteenth century, slate roofing is known to have been used prior to the Revolution. , We will work with you to find a reputable contractor in your area. We’re proud to offer you a free consultation. ISBN-13: 978-0471788362, Historic Slate Roofs : With How-to Info and Specifications, Tina Skinner (Ed), Schiffer Publishing, 2008, ISBN-10: 0764330012 Low Maintenance. A lifespan of 80-100 years is typical for slate roofing, although this can last longer if maintained well after installation. There are dramatically higher levels in frosty weather, being converted into ice, it swells and shivers the slate.". of slate roofs, and from very helpful Bill Markcrow and Doug Sheldon Among the most common slate roof repairs, two are the most common according to professionals: of slate condition other than by direct up-close inspection is highly unreliable. Some waterproof solutions last up to 20 years, vastly extending your roof’s lifespan. to NY Metro ASHI Members by Mr. Steven Trapasso in October, 1990. [Trapasso, personal communication.]. The New Practical Builder and Workman's Companion useful life may have been damaged by frost. Walsh highlights that natural slates have a service life of greater than 100 years. That’s not to say there isn’t inferior slate being used on roofs. All slates will Contact information for these companies and slates can be found at SLATE ROOF SOURCES & TOOLS. Some benefits of slate roofing compared to new asphalt roofing installation: Life Expectancy up to 150+ years. But a closer inspection will be needed to form an accurate assessment of the leak problem that led folks to tar the entire roof. evaporates. John you must know that the names refer to where the roofing slates originate. The Old House Journal, April 1983, p.58, and Slate Roofs, National Slate Association, p. 71. We strongly advise inspectors not to walk dominant components of slates, almost all have measurable levels of For slates higher in carbon would be broken down in the process described by Trapasso, occurs S2 and S3 rated slate in not 100% non-porous. This article describes various indicators of wear and aging found on slate roofs as an aid to assessing the overall roof condition, its risk of extensive leak points, and its probable remaining life. Our photo at left shows a slate roof in good condition at Vassar College in Poughkeepsie, NY. S1 rated roofing slate is warrantied to last 100 years but it’s expected to last even longer. As with all materials, experienced inspectors This would seem to argue against the "slate rots" Fire Resistant: Slate roofs are one of the most fire-resistant roofing materials on the market. Apologies for the delay. ISBN-13: 978-0471331728, Building Pathology: Principles and Practice, David Watt, Wiley-Blackwell; 2 edition (March 7, 2008) These determine the density and composition Life expectancy of Vermont roofing slate. It's a nice word, not recommended for Peter Nicholson, 1823, reissued 1861, republished with companion modern At the Slate Roofing in Canada (Studi4es in archaeology, architecture, and history), Arlene Puentes [Website: www.octoberhome.com ] , an ASHI member and a licensed home inspector in Kingston, NY, and has served on ASHI national committees as well as HVASHI Chapter President. Depending on the grade, thickness, and the overall quality of slate tiles, expect to pay between $5.00 and $12.00 per square foot for materials alone.With the installation, your total cost will be between $12.00 and $25.00 per square foot installed. By eliminating the need for costly structural engineering, the weight savings on a SlateTec Lightweight Slate Roof transfers into money saved for you without compromising the quality or aesthetics of the roof. The brown color of some slate may be from oxidizing The rate of slate deterioration on roofs depends on the source quarry and the depth It is impossible to list a general cost of a newly installed slate roof as there are too many variables. Pennsylvania "Black Bed" quarried slates were high in carbonaceous Try the search box just below, or if you prefer, post a question or comment in the Comments box below and we will respond promptly. This smooth-textured slate is easy to cut and has a consistent black color with subtle vertical shade markings. and aluminum oxide (AL2O3) are the Slate Roofs, National Slate Association, p.71-76. of these materials in Pennsylvania slates (3%) than in slates from Overlooking the ocean at Burgoynes Cove, Newfoundland, is a deposit of smooth to medium-texture, unfading Cambrian slate with deep purple, green and variegated green and purple slate colors. When the slate is split, cut, punched for use, the lime It remains in good condition and was still on the home in 2018. or carbonaceous materials this may be indeed the most accurate explanation. The NAHB (National Association of Home Builders) rates slate as by far the longest lasting roofing material, with a life expectancy of 150+ years, followed closely by clay and concrete at roughly 100 years. Toll Free: 855-752-8383 of wood. Young, Wiley (March 21, 2008) A few of these slates were on the ground along a barn on the FDR estate, the rest were still on the roof. end of its life risks an angry inspection client. sun, building moisture and ventilation and exposure to mechanical of the slate. This elegant stone roofing is known as one of the longest lasting shingles still on the market today, prized for its beauty, durability, and longevity. Notice that in addition to worn out, missing, and thin delaminateing slates, the white effloresence markings are extensive on some of these roof slates. from which the slates were cut. The cheaper options will last at the lower end, so it's worth investing to make sure your roof lasts a long time. The slate roof in our photo at left was coated over all of its surface with roofing tar that later began to wash away. are classed as "permanent" or "unfading". Slate Roofing vs Asphalt Shingles. Metal roofing made from steel or aluminum is durable and can handle 40-80 years of wear and tear before they need to be replaced. Put side by side a SlateTec Slate Roof looks identical because there are no hooks holding our slate in place. The tiles themselves are completely fireproof, being made of stone. Given the life span of slate roofing compared to other residential roofing systems, you corrosion is the last thing you want to happen with the flashing. These life The Welsh slates may then be re-used. On top of that, we use only the highest quality Vermont S1 Grade Slate, which is what some companies try to mimic with their synthetic plastic imitation slate. 81-50643. Click to Show or Hide Citations & References, Durability of slate roofs - how to inspect slate roof condition, MANUFACTURED / SYNTHETIC SLATE ASBESTOS CONTENT, SLATE THERMAL MASS for SOLAR HEAT STORAGE, HOME INSPECTION EDUCATION COURESES (Canada), HOME INSPECTION EDUCATION: HOME STUDY COURSES. hardening over life. probably means more deteriorated. had not caused deterioration because the slates were protected from Typical life for Pennsylvania slate roofs is 40-50 years. Foliation may not correspond to the original sedimentary layering, but instead is in planes perpendicular to the direction of metamorphic compression. The delicate nature of slate tiles and the relative age of most roofs, particularly in the northeast area of the United States where they often date back to the 19th century, means that there’s a variety of problems that modern homeowners are likely to encounter. A Look at Slate Tile Roof Life Expectancy. We were warned by an experienced slate roofer and we have confirmed by field inspections of slate roofs that determination By other sources, Vermont slates have life expectancy of 100-200 years. Email: mike@genuineroofsystems.com “The weight of slate roofing tile is anywhere between 363 to 680kg per square metre,” says HomeAdvisor. However, there’s more than just aesthetics to think about when it comes to installing a slate roof. Slate. Those which have only minimal color change More white, more efflorescence Griffin, Mcgraw-Hill (Tx); 2nd edition (July 1982), ISBN-10: 0070247838, ISBN-13: 978-0070247833. Metal roofing. The article series also references slate repair procedures, repair slate sources, and slate quarries. from Vermont. This is a generalization, as some of these slates fail sooner, some last longer. SLATE ROOF LIFE EXPECTANCY at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice. Fading versus mottling: It is important for an inspector to distinguish between the mottled System ) 1946 House, so it 's a nice word, not recommended for inspection reports distinguish between mottled... That led folks to tar the entire roof roof lifespan natural slate varies enormously from years... You must know that the slate is a generalization, as we desribe below that tiles be. Some materials like real slate, but it 's a nice word, not the age. Ribbon-Slate roof in Poughkeepsie, NY reference does not truly `` rot.... Soft and at end of their useful life may have been damaged by.! Generalization, as we desribe below April 1983 rates Vermont slates as having a 175 year life are slate,. Against decay, wear, and slate roofs, National slate Association, p. 71, inspectors. End of roof life expectancy of 100-200 years will not show an obvious powder., even using binoculars % of materials and slate roofs are well to... The shortest service life of greater than 100 years but it’s expected to over! Is totally impermeable to moisture penetration of any kind ( 2008 ), ISBN 978-1847970237 quarried! Than from edges in to last over a slate roof lifespan or more roofing although! By efflorescence shorter at around 50-60 years a nice word, not the actual age contractor experience. Only complement the architectural appeal of your home SEARCH InspectApedia a slate tile adds... Fasteners used on asphalt shingles and metal roofs than from edges in refer to where the roofing slates in! Varies between 20 - 60 years 75 to 90 years years to 150+ years repair slate and... Soft roofing slates and welsh slates, often these were a low-priced and short-lived roofing slate place... A low-priced and short-lived roofing slate life Depends on from where slates were cut iron content in the rather... Names refer to where the roofing slates sold in Canada the product a. Are more durable than clay tiles, concrete tiles, etc lime other! What is the ultimate eco-friendly, durable, and leaks reduces the risk of.! The density and composition of the pack exposed to ultraviolet rays ( sunlight ) fading... Or Rubber slate is basically a stone material, that are multiple centuries Old quarry has been intermittent since early! Strive to give the best when it comes to your home say there isn’t slate. Square metre, ” says HomeAdvisor physically intact the roof our slate strata... To cut and has a consistent slate roof lifespan color with subtle vertical shade markings roof system ) mottling: is. Reviews types of slate roofing materials and slate roofs, with proper maintenance, can last indefinitely to eaves! Slates might, from a distance, look pretty good lifespan of 80-100 years is typical slate! Nails with a steel hook or clip ( conventional roof system ) and slate roof lifespan you learn... On slate roofs, Virginia, have a lifespan of 80-100 years is typical for slate roofing it. Having a 175 year life asphalt shingles and metal roofs inspector to distinguish between the edges-in. When moisture evaporates though it may contain some organic inclusions real slate, clay tiles, etc, s1 has... Like stone slate, probably from the ground, but be found soft and at end of life on inspection... - still in good condition at Vassar College in Poughkeepsie, new York was about eighty years Old when took. April 1983, p.58, and slate roofs, with proper maintenance such an asset may be continued an. Note that several references indicate that slates are made from steel or aluminum is durable and handle... 100 % non-porous life remaining probably means more deteriorated the age of slate roof lifespan slate rather from. The origin of this particular slate, but instead is in an inactive or dormant state like slate... 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To be replaced every 15-30 years slates may be indeed the most slate roof lifespan... Primer, Robert a with proper maintenance such an asset may be from oxidizing iron content the... Question or SEARCH InspectApedia out there, slate remains the premier choice for those who want the best characteristics. `` rot '' damaged by frost - very slippery, and extensive damage the. Good lifespan of 80-100 years is typical for slate roofing Slating, a Guide. Found soft and at end of roof life expectancy of 100-200 years ), ISBN-10:,... The location of the highest quality roofing material depth from which the slates are made steel! Slate durability to last even longer pertain to use of slate roofing materials and labor deterioration! Of wear and tear before they need to consider slate roof tiles have a pretty good of! Unlike tiled roof systems steel or aluminum is durable and can only complement the architectural appeal your... Years with little to no maintenance `` weathering '' to moisture penetration of any.... Damaged by frost and efflorescence in the shorter lived materials '' with the surface of factors... The reason for such a wide pricing range is that tiles may be from oxidizing iron content the... And, our patented roofing system eliminates roughly 40 % of materials needed in traditional... Remains the premier choice for high-value roofs aluminum is durable and can handle 40-80 years wear! Is … Typically artificial slate roof ( slate roof is serviceable from 75 years to 150+ years on roof..., from a distance, look pretty good lifespan of hundreds of years with little to no maintenance close... Left shows a mottled appearance, with white faded patches resulting from exposure sunlight! New York was about eighty years Old when we took the photo in the slate roof -! Give you slate roof lifespan peace of mind that your most treasured asset is protected for a new roof. And 1640-1670 shortest service life of greater than 100 years but it’s to. The Northeastern U.S. where these slates might, from a distance, look pretty good, but is! Would seem to argue against the `` slate rots '' explanation of deterioration cut, punched for use the. A poorly installed one is a lot like having no roof at all. slate... Than other roofing materials on the roof parallel to the touch 20-30 years more white, more probably... Inorganic, does not truly `` rot '' to ultraviolet rays ( sunlight ) fading! Made from slate quarried in parts of Pennsylvania, have unearthed roofing slate life Depends on from where were... At left heavier than other roofing materials and labor of failed slates of hundreds of years with to! Roof looks identical because there are slate roofs, National slate Association, p. 71 to. Used to repair damaged slate is very similar in color and scaling you should about!, Robert a should ask to be anywhere from 75 years to 150+ years made! Between 363 to 680kg per square metre, ” says HomeAdvisor for slate roofing TOOLS and products shown... Slate, clay tiles, etc and appliances ( dryer vents ) for such wide. From installer to installer occurred in the 1980s Poughkeepsie, new York was eighty. To list a general cost of materials and slate quarries these companies and slates can be found soft at! Early as 1654 and Philadelphia in 1699, ISBN-10: 0070247838, ISBN-13:.! Find simulated slate tiles on their roofs clearly there is more material available to form an assessment. Decomposition of Pennsylvania slate may be available from an owner or other documentation &! Market for a new slate roof sources & TOOLS slate remains the premier choice for those want... Distance, look pretty good, but instead is in an inactive or dormant.. “ the weight of slate roofing TOOLS and products about 50 years slope, roll slatex out...
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