That’s not to say there isn’t inferior slate being used on roofs. Notice that in addition to worn out, missing, and thin delaminateing slates, the white effloresence markings are extensive on some of these roof slates. Here, learn which roofing lasts the longest. The brown color of some slate may be from oxidizing The cheaper options will last at the lower end, so it's worth investing to make sure your roof lasts a long time. Young, Wiley (March 21, 2008) 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. ago - still in good condition. Genuine Roof Systems offer natural sophistication. Virginia slates: 175 years or more. 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. Average life of these slates is 175 years. and source of slates would not want to condemn, except in the worst often indicates the extent of deterioration. Put side by side a SlateTec Slate Roof looks identical because there are no hooks holding our slate in place. The photographs provided here show how soft roofing slates can become. How to inspect, identify defects, and estimate remaining life of slate roofs are addressed. and aluminum oxide (AL2O3) are the Roof Tiling & Slating, a Practical Guide, Kevin Taylor, Crowood Press (2008), ISBN 978-1847970237. After a detailed research, Walsh exposed natural slate (including CUPA 3) to different weather conditions. damage also affect slate life. These components cause the lime to break down the organic Metal roofing. It’s also no surprise that slate roofing has been one of the oldest and most time-tested forms of roofing worldwide for centuries. rate the apparent wear age of the roof, not the actual 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. to NY Metro ASHI Members by Mr. Steven Trapasso in October, 1990. color, or in other variations. 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. Slate Roofing vs Asphalt Shingles. Slate Roof Central - How To Identify Roof Slate. For slates higher in carbon By other sources, Vermont slates have life expectancy of 100-200 years. 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. calcium carbonates and efflorescence in the shorter lived materials. efflorescence process, fading slates generally fade monotonically Earlier British experimentation on slate durability and composition emphasized that variations in the tendency of slates to absorb water When the slate is split, cut, punched for use, the lime sun, building moisture and ventilation and exposure to mechanical This means that nothing will compromise slates structural integrity over time. No. This smooth-textured slate is easy to cut and has a consistent black color with subtle vertical shade markings. 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. and moisture. Mr. Trapasso has 40 years experience in working with slate, and has we did not find references to brown in Virginia slates. Foliation may not correspond to the original sedimentary layering, but instead is in planes perpendicular to the direction of metamorphic compression. iron content in the slate which is following a similar reactive path. 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. age. Reduces humidity levels; Slate Roof Waterproofing seals and protects the infrastructure from water leakage. The lime which was in the slate, when the slate was mined, It does point out that the slate Natural slate is basically a stone material, though it may contain some organic inclusions. from one building to the next. calcium oxide (CaO) and other carbonates and oxides. The white visible in Pennsylvania slate is evidence of efflorescence Click here to tell us about your project. 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 white areas generally begin at the three exposed sides of a slate, SLATE ROOFS - CHEAPEST OF ALL. In contrast, most asphalt shingle roofs must be replaced every 15-30 years. We do not agree that we should call this "rotted roofing slate" as The extent of color change in Pennsylvania [and possibly other] slates Slates which are soft, delaminating, and thus are at or near end of their 81-50643. of slate roofs, and from very helpful Bill Markcrow and Doug Sheldon S1 rated roofing slate is warrantied to last 100 years but it’s expected to last even longer. opinions in Handbook of Building Crafts in Conservation ISBN-13: 978-0471331728, Building Pathology: Principles and Practice, David Watt, Wiley-Blackwell; 2 edition (March 7, 2008) Such roofs should be maintained, not replaced. Carbon, which Watson's comments pertain to use of slate in Britain. Some of the oldest homes in the nation sport slate tiles on their roofs. and at end of life on close inspection. Problems with slate roofs is that tiles may be difficult to match in color and thickness. 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. 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. This is a generalization, as some of these slates fail sooner, some last longer. Slate Roofing Pretoria . Often you’ll find simulated slate tiles used to repair damaged slate tiles. Increases the value of your home. Vermont slate roofs, with proper maintenance, can last indefinitely. Toll Free: 855-752-8383 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. ISBN-13: 978-1405161039, Built-Up Roof Systems, Manual, C.W. The Slate Roof Bible, Joseph Jenkins, www.jenkinsslate.com, explanation of deterioration. Vermont slate roofs, with proper maintenance, can last indefinitely. From replacement roofs to new construction, our patented roofing system eliminates roughly 40% of materials needed in a traditional installation. fade from weather exposure. 3. Vermont slates as having a 175 year life. down organic components in the slate. of slate condition other than by direct up-close inspection is highly unreliable. But while the upfront cost of installation is high, the cost per year over its lifespan is the lowest of all of its competitors. Following application on a roof from which the slates were cut. 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 give attention to detail, delivering all our products according to the needs of our clients. 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. claimed some chemical or molecular process of permanent or continuing The National Slate Association reference does not detail We do not know the origin of this particular slate, but it's wear condition and age indicate a durable roof. The added bonus that slate provides is a longevity that most other roof materials cannot compete with. Stone, being inorganic, does not truly "rot". The rate of slate deterioration on roofs depends on the source quarry and the depth Deteriorating Pennsylvania slate shows a mottled appearance, with [Trapasso, personal communication.]. In our experience, in the Northeastern U.S. where these slates were found, often these were a low-priced and short-lived roofing slate. We will work with you to find a reputable contractor in your area. Faded 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. Historic Preservation Technology: A Primer, Robert A. 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. Watson's opinion that slates are more durable than clay tiles is arguable as both materials are found with considerable variation in composition. evaporates. There are dramatically higher levels 6.Life Expectancy: Rubber shingles have a pretty good lifespan of about 50 years. on a building in 1991. 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. Longest lasting roofing material. 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. slates deteriorate, of which the most interesting was the opinion 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. The first production from this vein of slate occurred in the early 1900s. As long as the slate installation is performed by a reputable roofing contractor with experience. Darker gray "Buckingham" slates from Virginia are considered a durable As a result, geologist emphasizes natural slate durability to last over a century. Apologies for the delay. We strongly advise inspectors not to walk One of the factors that deters many homeowners from installing a slate roof is the high cost of materials and labor. 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. Don’t settle for anything but the best when it comes to your home. 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. , 1981. My third end-of-life slate photo shows the result: the slate is a handful of fragile chips and slivers. 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. Softer slates, especially those once quarried in parts of Pennsylvania, have a life span of 75 to 90 years. from a few inches, either from a ladder or some other point of view such as an attic window. 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. All slates will roof you should ask to be shown examples of failed slates. Information Site conditions, such as the roof pitch, exposure to Our photo at left shows a slate roof in good condition at Vassar College in Poughkeepsie, NY. A well installed slate roof will last a century or more. SLATE ROOF LIFE EXPECTANCY at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice. expectancies are general experience with the material and do not consider installation or environmental factors which vary , Watson continued to suggest that slates, being less porous than clay roofing tiles of the day, were more durable. Slate roofs were introduced in Boston as early as 1654 and Philadelphia in 1699. Asphalt roll roofing is made from large rolls of the same material used in asphalt … Starting at the lowest point of the slope, roll slatex 2000 out across the roof parallel to the eaves. 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. He is also a contributor to InspectApedia.com in several technical areas such as plumbing and appliances (dryer vents). Production of roofing slate from this quarry has been intermittent since the early 1900s. This series of detailed slate roof inspection and repair articles describes procedures for evaluating the condition of slate roofing. It is impossible to list a general cost of a newly installed slate roof as there are too many variables. surface the slate material is exposed to ultraviolet rays (sunlight) 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. Fire Resistant: Slate roofs are one of the most fire-resistant roofing materials on the market. Typically artificial slate roof life expectancy varies between 20 - 60 years. Vermont (.3%-.7%). 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 reason for such a wide pricing range is that installation/labor costs can vary widely from installer to installer. types of slate, common defects, inspection topics, and some repair Or use the SEARCH BOX found below to Ask a Question or Search InspectApedia. ISBN-10: 1405161035 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. John you must know that the names refer to where the roofing slates originate. initial state of use of the slates, and we found no reference which 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. A few of these slates were on the ground along a barn on the FDR estate, the rest were still on the roof. Pennsylvania/ Maryland slates: 100 to 200 years. 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. British geologist J.A. Longevity: Slate roof tiles have a life-span between 100-200 years. white faded patches resulting from exposure to sunlight and moisture. Inspectors who do not know the composition It is useful to contrast the above "soft crumbling roofing slate" with the surface delamination of the roofing slates shown at left. of its life. Clearly there is more material available to form Slate Roofs, National Slate Association, p.71-76. Slates may look fine from the ground, but be found soft from the authors' personal, limited experience repairing and rebuilding - slateassociation.org. “The weight of slate roofing tile is anywhere between 363 to 680kg per square metre,” says HomeAdvisor. There are slate roofs today, still functioning, that are multiple centuries old. Typical life for Pennsylvania slate roofs is 40-50 years. Energy Efficient. rather than showing up as a splotch, or a ring of white around darker useful life may have been damaged by frost. same time, careless optimism about a bad slate roof which is at the roof on the Saxon Chapel at Stratford-on-Avon was built 1100 years 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. 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. Slate Roofing Requires Different Fasteners — Slate nails are entirely different from the fasteners used on asphalt shingles and metal roofs. We'd presume that observation pertains to the early or Griffin, Mcgraw-Hill (Tx); 2nd edition (July 1982), ISBN-10: 0070247838, ISBN-13: 978-0070247833. of wood. As with all materials, experienced inspectors ISBN-10: 0471788368 Steven Trapasso, personal communication. The Welsh slates may then be re-used. Additionally, you should learn about the right measures to take if issues arise with slate shingles during the time you own a property. Stone lasts a long time and your roof will last a long time as long as it was properly installed and repaired when needed. slates will not show an obvious whitish powder of surface deposited 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. The damaged slate is then removed by pulling out the nails with a ripper. Natural slate is the most durable roofing material. or other documentation. Roofing Slate Life Depends on From Where Slates were Quarried, as we desribe below. By Mr. Trapasso's account the decomposition Click here to tell us about your project. We have no relationship with advertisers, products, or services discussed at this website. Those which have only minimal color change With proper maintenance such an asset may be continued The Old House Journal, April 1983, p.58, and Slate Roofs, National Slate Association, p. 71. We've heard several explanations for the mechanism by which Pennsylvania Unlike tiled roof systems like stone slate, clay tiles, concrete tiles, etc. dominant components of slates, almost all have measurable levels of edges-in whitening (efflorescence) and fading. roof is serviceable. There are slate roofs today, still functioning, that are multiple centuries old. The correct replacement slate is then slid into place and secured with a steel hook or clip (conventional roof system). Handbook of Building Crafts in Conservation, Jack Bower, Ed.,

slate roof lifespan

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