slate roof lifespan

Stone lasts a long time and your roof will last a long time as long as it was properly installed and repaired when needed. That’s not to say there isn’t inferior slate being used on roofs. There are slate roofs today, still functioning, that are multiple centuries old. Contact information for these companies and slates can be found at SLATE ROOF SOURCES & TOOLS. 3. 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. 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. A Look at Slate Tile Roof Life Expectancy. ISBN-13: 978-0471331728, Building Pathology: Principles and Practice, David Watt, Wiley-Blackwell; 2 edition (March 7, 2008) 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. As a result, geologist emphasizes natural slate durability to last over a century. Increases the value of your home. Production of roofing slate from this quarry has been intermittent since the early 1900s. AD That’s the type on top of my 1946 house, so I am in the market for a new slate roof. , 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. This red slate, probably from the Granville NY quarry, was also wet through to the touch. We were warned by an experienced slate roofer and we have confirmed by field inspections of slate roofs that determination All slates will did Mr. Trapasso, but on seeing how soft and delaminated this slate can become, we can understand his loose use of that term. and source of slates would not want to condemn, except in the worst of less than 1%. 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. 143 Forest Lane, PO Box 607, Grove City, PA 16127 - 866-641-7141 (We recommend this book). iron content in the slate which is following a similar reactive path. Some benefits of slate roofing compared to new asphalt roofing installation: Life Expectancy up to 150+ years. Or use the SEARCH BOX found below to Ask a Question or Search InspectApedia. from one building to the next. The Old House Journal, April 1983, p.58, and Slate Roofs, National Slate Association, p. 71. It is impossible to list a general cost of a newly installed slate roof as there are too many variables. We have no relationship with advertisers, products, or services discussed at this website. Posted on September 4, 2020 October 6, 2020 by Brava Roof Tile. mineral salts as thick as that left by efflorescence. Walsh highlights that natural slates have a service life of greater than 100 years. Longevity: Slate roof tiles have a life-span between 100-200 years. The National Slate Association reference does not detail Peter Nicholson, 1823, reissued 1861, republished with companion modern The cheaper options will last at the lower end, so it's worth investing to make sure your roof lasts a long time. Click here to tell us about your project. damage also affect slate life. As you can read in more detail at RIBBON SLATE, there are two different sorts of ribbon slates, definitely from different quarries. Some of the oldest homes in the nation sport slate tiles on their roofs. Historic Preservation Technology: A Primer, Robert A. Canadian roofing slates are made from slate quarried in Quebec or possibly Newfoundland, and sold by a variety of companies. 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. Earlier British experimentation on slate durability and composition emphasized that variations in the tendency of slates to absorb water 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. We've heard several explanations for the mechanism by which Pennsylvania or other documentation. John you must know that the names refer to where the roofing slates originate. Virginia slates: 175 years or more. 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. In our experience, in the Northeastern U.S. where these slates were found, often these were a low-priced and short-lived roofing slate. Natural slate roofs are well known to have a lifespan of hundreds of years with little to no maintenance. 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. roof you should ask to be shown examples of failed slates. Welsh roofing slate is described by 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. Handbook of Building Crafts in Conservation, Jack Bower, Ed., Deteriorating Pennsylvania slate shows a mottled appearance, with Having your roof waterproofed reduces the risk of damage. Clearly there is more material available to form in this article is taken from the references shown below, from inspection 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. slates will not show an obvious whitish powder of surface deposited rather than showing up as a splotch, or a ring of white around darker recognized as not as durable; you'd not expect to find it surviving from a few inches, either from a ladder or some other point of view such as an attic window. With proper maintenance such an asset may be continued - lime deposited on the slate surface. 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. My third end-of-life slate photo shows the result: the slate is a handful of fragile chips and slivers. Finally, when comparing slate properties it is worth remembering the location of the slate quarry and considering the shipping costs of alternative slates. 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. the mechanism of slate deterioration. The tiles themselves are completely fireproof, being made of stone. Risks include falling - very slippery, and extensive Life expectancy of Vermont roofing slate. In contrast, most asphalt shingle roofs must be replaced every 15-30 years. The first is or really past end of roof life and the second slate roof has good life remaining. Unlike tiled roof systems like stone slate, clay tiles, concrete tiles, etc. opinions in Handbook of Building Crafts in Conservation often indicates the extent of deterioration. 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. By other sources, Vermont slates have life expectancy of 100-200 years. and exposed. There are slate roofs today, still functioning, that are multiple centuries old. , 1981. of its life. For slates higher in carbon It is useful to contrast the above "soft crumbling roofing slate" with the surface delamination of the roofing slates shown at left. Inspectors who do not know the composition This smooth-textured slate is easy to cut and has a consistent black color with subtle vertical shade markings. Vermont slate roofs, with proper maintenance, can last indefinitely. Lime and other mineral salts are These slates might, from a distance, look pretty good, but claimed some chemical or molecular process of permanent or continuing Griffin, Mcgraw-Hill (Tx); 2nd edition (July 1982), ISBN-10: 0070247838, ISBN-13: 978-0070247833. Above, the ribbon-slate roof in Poughkeepsie, New York was about eighty years old when we took the photo in the 1980s. 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. may be the principal cause of deterioration seen by modern inspectors. Fading versus mottling: It is important for an inspector to distinguish between the mottled growing towards the center of the slate as a function of time and ago - still in good condition. a clear love affair with the material, particularly when it comes The brown color of some slate may be from oxidizing Average life of these slates is 175 years. From replacement roofs to new construction, our patented roofing system eliminates roughly 40% of materials needed in a traditional installation. we were easily able to crush the slates with my fingers. John Cranor [Website: / ] is an ASHI member and a home inspector (The House Whisperer) is located in Glen Allen, VA 23060. types of slate, common defects, inspection topics, and some repair A few of these slates were on the ground along a barn on the FDR estate, the rest were still on the roof. 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. All rights reserved. On the other hand, even with proper maintenance, wood-shake, asphalt shingle, and concrete tile roofs are known to last only 20 […] Apologies for the delay. Darker gray "Buckingham" slates from Virginia are considered a durable ISBN-13: 978-1405161039, Built-Up Roof Systems, Manual, C.W. are classed as "permanent" or "unfading". - Roof Tiling & Slating, a Practical Guide, Kevin Taylor, Crowood Press (2008), ISBN 978-1847970237. The Welsh slates may then be re-used. Slates with these ribbons have the shortest service life - about 75 to 90 years. 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. We’re proud to offer you a free consultation. Problems with slate roofs is that tiles may be difficult to match in color and thickness. Indeed unglazed clay absorbs more water (up to 10%) than slate (usually 1%) but tiles are not necessarily damaged by these freeze-thaw conditions. 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. This article series reviews Stone, being inorganic, does not truly "rot". dominant components of slates, almost all have measurable levels of S1 rated roofing slate is warrantied to last 100 years but it’s expected to last even longer. In fact, S1 slate has all the best physical characteristics of the highest quality roofing material in general worldwide. sunlight. This is a generalization, as some of these slates fail sooner, some last longer. to NY Metro ASHI Members by Mr. Steven Trapasso in October, 1990. Pennsylvania/ Maryland slates: 100 to 200 years. As the railroads spread so did the proliferation of slate roofs and by the 1870s the US had become a ne… Slate roofing was once the material of choice for high-value roofs. One of the factors that deters many homeowners from installing a slate roof is the high cost of materials and labor. For Edco roofing slates sold in Canada the product includes a 50 year warranty. He is also a contributor to in several technical areas such as plumbing and appliances (dryer vents). 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. 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". Asphalt roll roofing is made from large rolls of the same material used in asphalt … The New Practical Builder and Workman's Companion down organic components in the slate. rate the apparent wear age of the roof, not the actual 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. The extent of color change in Pennsylvania [and possibly other] slates But while the upfront cost of installation is high, the cost per year over its lifespan is the lowest of all of its competitors. Slate Roofing Pretoria . This is not as good as some materials like real slate, but it is better than typical shingles which are about 20-30 years. By direct inspection we mean looking at slates 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. inspection reports. S2 and S3 rated slate in not 100% non-porous. Click here to tell us about your project. Our photo at left shows a slate roof in good condition at Vassar College in Poughkeepsie, NY. Faded We will work with you to find a reputable contractor in your area. Such roofs should be maintained, not replaced. Even with all the modern roofing materials out there, slate has retained its position near the head of the pack. 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. and at end of life on close inspection. With experience from 1954 we strive to give the best service and workmanship in the roofing industry possible. 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. 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. Continue reading at SLATE ROOF PATTERNS or select a topic from the closely-related articles below, or see the complete ARTICLE INDEX. damage to the slates. These determine the density and composition materials in the slate (shale), making the slate increasingly porous Some waterproof solutions last up to 20 years, vastly extending your roof’s lifespan. impurities and were recommended by the Slate Association only for from Vermont. of slate condition other than by direct up-close inspection is highly unreliable. According to the National Slate Association, (quoting). 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. The lime which was in the slate, when the slate was mined, we observe that while oxides of silica (SIO2) A well installed slate roof will last a century or more. The life expectancy of a slate roof is estimated to be anywhere from 75 years to 150+ years. Watson's comments pertain to use of slate in Britain. The Slate Roof Bible, Joseph Jenkins,, of wood. However, there’s more than just aesthetics to think about when it comes to installing a slate roof. dissolved and deposited on the surface of the slate when moisture Starting at the lowest point of the slope, roll slatex 2000 out across the roof parallel to the eaves. Fire Resistant: Slate roofs are one of the most fire-resistant roofing materials on the market. Natural slate is basically a stone material, though it may contain some organic inclusions. Typically artificial slate roof life expectancy varies between 20 - 60 years. Following application on a roof This series of detailed slate roof inspection and repair articles describes procedures for evaluating the condition of slate roofing. These components cause the lime to break down the organic Slate Roof Central - How To Identify Roof Slate. Typical life for Pennsylvania slate roofs is 40-50 years. fade from weather exposure. Watson continued to suggest that slates, being less porous than clay roofing tiles of the day, were more durable. Congress Catalog Card Nr. 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. Carbon, which Don’t settle for anything but the best when it comes to your home. Steven Trapasso, personal communication. This simple combination of our interlayment system and genuine materials makes for a roof that is easy to install, lighter weight, and cost-effective. As with all materials, experienced inspectors Natural slate is the most durable roofing material. of circumstances, a Vermont slate roof. 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. Vermont slates as having a 175 year life. 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. ISBN-10: 1405161035 Rubber shingles or Rubber slate is … roof is serviceable. At the 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 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. Installed correctly, a new roof will last at least 15 years, but the exact lifespan depends on the material. Additionally, you should learn about the right measures to take if issues arise with slate shingles during the time you own a property. No. Natural Stone is the ultimate eco-friendly, durable, and beautiful roofing material. The first production from this vein of slate occurred in the early 1900s. For fibre cement roof slates, the life expectancy is a little shorter at around 50-60 years. Vermont (.3%-.7%). Those which change more 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. Monotonically means that the color change is even across the material 6.Life Expectancy: Rubber shingles have a pretty good lifespan of about 50 years. By the 1920's this slate was You will have an additional layer of protection against decay, wear, and leaks. Vermont slate roofs, with proper maintenance, can last indefinitely. 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. Foliation may not correspond to the original sedimentary layering, but instead is in planes perpendicular to the direction of metamorphic compression. 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. The life expectancy of natural slate varies enormously from 70-100 years, depending on the quality of the slate. Young, Wiley (March 21, 2008) However as long as the slates are physically intact the 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. Toll Free: 855-752-8383 Slate Roofing in Canada (Studi4es in archaeology, architecture, and history), Arlene Puentes [Website: ] , an ASHI member and a licensed home inspector in Kingston, NY, and has served on ASHI national committees as well as HVASHI Chapter President. We'd presume that observation pertains to the early or 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. [Trapasso, personal communication.]. Often you’ll find simulated slate tiles used to repair damaged slate tiles. A slate rating or grade can tell you a lot about what kind of lifespan you can expect from the stone over time. There are dramatically higher levels If a roofer recommends tearing off the whole edges-in whitening (efflorescence) and fading. British geologist J.A. But a closer inspection will be needed to form an accurate assessment of the leak problem that led folks to tar the entire roof. color, or in other variations. The white visible in Pennsylvania slate is evidence of efflorescence No roofing contractor? Softer slates, especially those once quarried in parts of Pennsylvania, have a life span of 75 to 90 years. We also provide slate sources and where to buy slate roofing materials and slate roofing tools and products. The purple slate is very similar in color to Welsh Purple from England. we did not find references to brown in Virginia slates. 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. or carbonaceous materials this may be indeed the most accurate explanation. “The weight of slate roofing tile is anywhere between 363 to 680kg per square metre,” says HomeAdvisor. Slate roofs were introduced in Boston as early as 1654 and Philadelphia in 1699. ©2020 Genuine Roof Systems. 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.

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