Weather Exposure Roofing

A five bundles will cover 100 sq.

Weather exposure roofing. B maximum recommended weather exposure for 3 ply roof construction. Residential and commercial roofing shingles slate roof ventilation roof underlayments asphaltic and tpo roof membranes. B maximum recommended weather exposure for 3 ply roof construction. C maximum recommended weather exposure for two ply roof construction.

Shingle exposures for wood roofs. 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. 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. Roofing shingles and materials plus factory certified roofers including ratings from real homeowners from north america s largest roofing manufacturer.

The classifications are based on material composition as well as the durability of the adhesives utilized in the manufacturing process. Wood roof shingle exposure specifications. Nails are exposed to the weather. 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.

The core material in an asphalt roofing shingle manufactured from glass fibers. 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. Of roof area when used as starter finish course at 10 exposure. Utilizing the wrong panels or sheathing could compromise the structure which is exposed to weather.

Nesting is a technique where a roofing professional applies the top edge of the new shingle at the bottom edge of the old shingle. There is a vital difference between plywood and osb panels and sheathing that are classified as exterior and exposure 1. The maximum weather exposure for wood shakes or wood shingles depends on the shingle size and the slope or pitch of the roof. Allowable shingle exposure may also vary by the shingle grade something that you might infer by visual inspection of the shingles matching.

D all coverage based on an average 1 2 spacing between shakes. D all coverage based on an average spacing between shakes. See figure a felt. E maximum recommended weather exposure.

Fibrous material saturated with asphalt and used as an underlayment or sheathing paper. This will only work if the old and new shingles have the same exposure. Cdx should only be used for applications as outlined under exposure 1 above. That portion of the roofing exposed to the weather after installation.