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ASTM D226 / D226M Standard — 09: Specification for Asphalt-Saturated Organic Felt Used in Roofing and Waterproofing. [7] Type I - #15 or 15 lb. perforated or non-perforated; Type II - #30 or 30 lb. perforated or non-perforated; ASTM D4869 / D4869M Standard — Specification for Asphalt-Saturated Organic Felt Underlayment Used in Steep Slope ...
Steep is above 9:12 (3 in 4) [4] (21:12) (7 in 4) and may require extra fasteners. US convention is to use whole numbers when even (e.g. "three in twelve") or the nearest single or two-digit fraction when not (e.g. either "five and a half in twelve" or "five point five in twelve", each expressed numerically as 5 + 1 ⁄ 2 :12 and 5.5:12 ...
"The association has more than 3,500 members from all 50 states and 53 countries and is affiliated with 97 local, state, regional and international roofing contractor associations” [1] [2] Professional Roofing is NRCA's monthly publication. Reid Ribble is the current Chief Executive Officer.
Ponding water accelerates the deterioration of many materials, including seam adhesives in single-ply roof systems, steel equipment supports, and particularly roofing asphalt. On low-slope asphalt roofs, ponding water allows the oil solvent components of the asphalt to leach out and evaporate, leaving the roof membrane brittle and susceptible ...
Concrete roofing is composed of concrete reinforced with fibers of some sort. Structural concrete can also be used for flat roof constructions. There are three main categories, precast/prestressed, cast-in-place and shell. There are many types of precast/prestressed concrete roofing. The following are the most common types. [9]
A flat roof is a roof which is almost level in contrast to the many types of sloped roofs. The slope of a roof is properly known as its pitch and flat roofs have up to approximately 10°. [1] Flat roofs are an ancient form mostly used in arid climates and allow the roof space to be used as a living space or a living roof. Flat roofs, or "low ...
In some cases, a cricket can be used to transition from one roof area to another. On low-slope and flat roofs with parapet walls, crickets are commonly used to divert water to the drainage, against or perpendicular to the main roof slope. The pitch of a cricket is sometimes the same as the rest of the roof, but not always. For Steep-slope roofs ...
For low-slope roof applications, a roof product qualifying for the Energy Star label under its Roof Products Program must have an initial solar reflectivity of at least 0.65, and weathered reflectance of at least 0.50, in accordance with EPA testing procedures. [53]