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One of the primary reasons for building homes with steep roof pitches is to prevent the build-up of snow, sleet, and ice on the roof. If the roof is too flat, the amount of snow and ice continues to grow instead of simply sliding down a steep pitch and off the roof as it melts. Unfortunately, if the snow and ice build up too much, this can cause lasting structural damage, and in some cases, could even result in part of the roof collapsing.
If you are making changes to your home, check local building codes and regulations for the minimum roof pitch and consider the typical weather conditions that the home will experience throughout the year. One of the reasons why low pitch roofs are becoming more popular is that they are easier to work on and install.
This simple improvement in footing is a significant factor that makes it much safer to have a home with a low pitch roof than a home with a steep pitch roof.
Additionally, a low pitch roof is a good idea if you are installing a new roof on a home. The roof boards will not slide as much on a low pitch as they would on a steep pitch, making it easier to keep them in position during installation.
The low pitch can speed up the installation process since roofing shingles are less likely to slide and a large pile can be kept on the roof without worrying about them falling off. Disclosure: BobVila. You agree that BobVila. The risk of high levels of airborne asbestos from cementious roofing products is probably very low unless the workers are using power equipment like sanders and saws on these substances.
According to NRCA, the National Roofing Contractors' Association, their studies up to February had not found a single roofing job at which these limits were exceeded, and NRCA reported that in some cases no fiber release was detected. But it appears that the association may have been referring only to asphalt-based roofing materials, not jobs involving the demolition of other ACRM such as cement-asbestos roof shingles or "asbestos roof tiles" as some consumers refer to them which might produce different statistics.
I need to find the engineering properties of a specific profile of transite roof deck. Please see the attached sketch and picture.
I will gladly purchase the correct catalog if you can help me identify which catalog that is. For engineering properties of a contemporary material you'd find easiest results contacting the manufacturer. And Woods cites Hannant as a source for the engineering properties of various fiber cement roofing materials.
The original properties of corrugated cement roofing using asbestos, which you referred to as transite roofing, can also be found in some early patent applications, though I have not seen complete engineering analysis of the materials strengths and other properties in those documents. For the engineering properties of an older asbestos-cement roofing product which is what I think I see in your first photo above and again at left that is of course no longer in production one might find an old specification document but in my OPINION that would be dangerously misleading as weathered, worn building materials change in properties such as density and impact resistance.
My experience with direct inspection as well as owner reports of older fiber cement and asbestos cement and corrugated asbestos cement is that the material becomes quite fragile - at that age its properties would be quite different from the original product specifications. For that situation, if it were actually justified, one would have to send representative samples of the material to a materials testing laboratory - which of course raises its own issues about roof damage and material disturbance.
I notice in one of the links you provided that the life expectancy of cement asbestos shingles was given as 30 years with some 50 years old roofs in good condition. The most detailed analysis of the engineering properties of Asbestos-Cement roof decking materials is the by el Hakim cited below. His conclusion begin on p. My own direct inspection as well as field anecdotal data show that the when exposed to the weather, more water and temperature variations than sunlight, asbestos cement products used on roofs tend to become soft and quite fragile.
Effects of biological agents, particularly lichens, moss and to a degree, fungi also play a role in this deterioration. My opinion I am not an engineer but have field experience and have done some research on the topic is that if the corrugated asbestos-cement roof decks you describe have been protected from the weather including leaks through the roof membrane and thus from water and freeze-thaw cycle effects then the materials may be in better condition than the roofs I've inspected that have been directly exposed to the weather.
Asbestos cement roof deterioration elements we expect to find in the field include:. However without lab testing combined with an intelligent assessment of the extent of roof area over which a particular form of deterioration is observed, in my opinion, a quantitative statement of roof life remaining would be unreliable.
See Giller on visual assessment of roof decking. A more detailed inspection of the asbestos-cement corrugated material-roofed building s you are evaluating is needed to determine the leak history as well as to find other instances of mechanical or other damage to the roofs. Certainly one of your photos shows one of the worst, most heaved, out of flat membrane roof surfaces I have seen. One might choose the most-suspect roof area for further, more invasive inspection or materials testing.
Contemporary roofing product manufacturers make reinforced fiber-cement roofing shingles and other roofing products which look like, perform similarly to, and need to be installed similarly to the original corrugated asbestos-cement sheet roofing - but these new products are free of asbestos.
Photo at left: author points to new fiber cement roofing product. As we explained in our discussion of cement asbestos shingles, the replacements for corrugated asbestos cement roofing products are reinforced with a variety of fibers including fiberglass.
Other replacements for asbestos-cement roofing use both different fibers and a different aggregate perlite to replace the asbestos. Some of the substitute products have been in use for more than 30 years Matt I agree that you'd treat old fibre cement products like corrugated siding as presumed to contain asbestos.
That's an interesting marking in your photo - it might be a production date as it looks to me like a series of numbers including?? If that's where your building is located manufacturers did not begin using non-asbestos fibre cement products before about In the U.
Later, by the early s, rather than emobssing the fibre cement with raised or depressed letters and numbers, the under-side of some fibre-cement roofing in the UK was marked in ink with the manufacturer's identification code and lot number. Hi, I've inherited a shed on an allotment, it's timer framed with a tin roof, sides are partially clad in corrugated cement fibre, I'm guessing 30 yrs old so likely to contain asbestos.
Wood and slate shingles do not lock together as tightly as other types of shingles. Roofs on Victorian-era houses were often sharply angled with a steep pitch. Think of an old house with its soaring peaks and you have a picture of a high-pitched roof. Most roof materials have a recommended pitch range for which they are most appropriate. The rules can occasionally be broken, but generally, you should not exceed the low range of the recommendation.
Actively scan device characteristics for identification. Use precise geolocation data. Select personalised content. Create a personalised content profile. Measure ad performance. Select basic ads. Create a personalised ads profile. Select personalised ads. Apply market research to generate audience insights. Measure content performance. Develop and improve products. List of Partners vendors. Example A roof with a vertical measurement anywhere along its slope of 2 feet and a horizontal measurement of 4 feet has a pitch.
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