Minimum Roof Slope For Cedar Shingles

Asphalt shingles can only be installed on roof slopes of 2 12 or greater.

Minimum roof slope for cedar shingles.

The recommended minimum roof pitch for shingles is 2 12 or simply two units of vertical rise to every twelve units of horizontal span. At these low pitches 14 22 degrees care must be taken and a water impermeable vapour permeable underlay must be used underneath with a ventilated space between the membrane and the shingles. That works out to about nine degrees if that works better for you. At these pitches there is a possibility of some water penetration.

18 43 asphalt shingles with special underlayment requirements 2 in 12. The minimum requirement is 2 12. To achieve a sound watertight roof the gauge of the shingle assuming the standard 5x or 400mm shingle must be closed to 95mm giving a 4 ply roof. Asphalt shingles minimum roof slope roof pitch r905 2 2.

Minimum pitch for cedar roofs if you desire a cedar roof for your home the ideal pitch for your roof ranges from a five pitch to a 12 pitch. Minimum required roof slope for roofing materials. The minimum roof pitch for shingles and shakes is 14 degrees. It is important for shingle roofs to function properly and one method of ensuring that this is achieved is to observe the pitch requirements for the shingles.

Asphalt shingles continue to be the most widely installed roof covering option in north america. This means for every 12 horizontal units the roof must rise a minimum of 2 vertical units. Page 23 cedar care maintenance overview a word about topical treatments for installed roofs topical treatment products power washing the beauty of cedar download pdf page 24 coverage and exposure tables shingle coverage table 1 shingle exposure table 2 shake coverage table 3 shake exposure table 4 download pdf. While a low pitch roof may not show the aesthetic qualities of cedar shingles to full advantage they provide a lightweight durable solution where a pitched roof is required.

Wood shingles are more susceptible to leaks than composite or asphalt shingles because they don t lock as tightly or lay as flat as traditional shingles. Shingles of all types need to have a slope to function properly. The minimum recommended slope for standard installation of shingles is 3 12 and 4 12 for shakes. Over the membrane install vertical 2x4 battens lined up with the rafters then spaced sheathing as described below.

Minimum required slope x in 12 minimum required slope degrees asphalt shingles. Roofing material or system. In 12 0 25 in 12 1 19 built up roof coal tar pitch. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.

9 46 built up roof asphalt. The 2 12 number is rise over run or two units of vertical for every 12 units horizontal.