Weather Exposure Roofing

That portion of the roofing exposed to the weather after installation.

Weather exposure roofing.

Coverage is based on 12 12 pack 5 bundle square at 7 1 2 exposure. Roof shingle exposure amount is the portion measured in inches or cm of asphalt shingle that remains exposed to weather as successive courses of shingles are installed up the roof slope. This will only work if the old and new shingles have the same exposure. Residential and commercial roofing shingles slate roof ventilation roof underlayments asphaltic and tpo roof membranes.

Fibrous material saturated with asphalt and used as an underlayment or sheathing paper. Exposure 1 rated plywood commonly called cdx in the trade is sometimes mistaken as an exterior rated sheathing and erroneously used in applications for which it does not possess the required resistance to weather. Roofing shingles and materials plus factory certified roofers including ratings from real homeowners from north america s largest roofing manufacturer. Allowable shingle exposure may also vary by the shingle grade something that you might infer by visual inspection of the shingles matching.

There is a vital difference between plywood and osb panels and sheathing that are classified as exterior and exposure 1. The classifications are based on material composition as well as the durability of the adhesives utilized in the manufacturing process. If the existing roof s shingle exposure matches the new shingles the new shingles are sometimes nested onto the roof. Wood roof shingle exposure specifications.

C maximum recommended weather exposure for two ply roof construction. Nails are exposed to the weather. Shingle exposures for wood roofs. By creating a barrier at the most vulnerable areas of your roof at the eaves and rakes in valleys around chimneys etc weatherwatch leak barrier will help prevent leaks due to water backing up in your gutters wind driven rain and in the north damaging ice dams.

See figure a felt. We measure shingle exposure as the distance from the lower edge of an exposed roof shingle or shingle tab down slope to the lower edge of the shingle in the. C maximum recommended weather exposure for 2 ply roof construction. D all coverage based on an average spacing between shakes.

B maximum recommended weather exposure for 3 ply roof construction. B maximum recommended weather exposure for 3 ply roof construction. Cdx should only be used for applications as outlined under exposure 1 above. A five bundles will cover 100 sq.

E maximum recommended weather exposure. Of roof area when used as starter finish course at 10 exposure. Nesting is a technique where a roofing professional applies the top edge of the new shingle at the bottom edge of the old shingle. D all coverage based on an average 1 2 spacing between shakes.