Minimum Roof Pitch For Wood Shingles

Most homes are considered steep pitch ranging from four pitch to nine pitch but more dramatic rooflines may haves roof slopes of 10 pitch to 21 pitch.

Minimum roof pitch for wood shingles.

What is the minimum pitch slope of an asphalt shingle roof. Asphalt shingles continue to be the most widely installed roof covering option in north america. The maximum weather exposure for wood shakes or wood shingles depends on the shingle size and the slope or pitch of the roof. Wood shakes minimum roof slope roof pitch r905 8 2.

In 12 0 25 in 12 1 19 built up roof coal tar pitch. Minimum required slope x in 12 minimum required slope degrees asphalt shingles. Roofing material or system. That works out to about nine degrees if that works better for you.

Fasteners for asphalt shingles shall be galvanized steel stainless steel aluminum or copper roofing nails minimum 12 gage 0 105 inch 3 mm shank with a minimum 3 8 inch diameter 9 5 mm head complying with astm f1667 of a length to penetrate through the roofing materials and not less than 3 4 inch 19 1 mm into the roof sheathing. Low slopes are more typically used in commercial properties but in the 1960s it was trendy to build homes with a low pitch roof with just a bit of slope to allow for drainage. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. The minimum requirement is 2 12.

Allowable shingle exposure may also vary by the shingle grade something that you might infer by visual inspection of the shingles matching against wood shingle grade definitions or if a shingle identification label can be located. They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends. 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. 18 43 asphalt shingles with special underlayment requirements 2 in 12.

But shingle roofing is not watertight in the sense that standing water or wind driven water on a low slope roof can work its way up between the laps which is the reason for the minimum 2 12 slope. At these pitches there is a possibility of some water penetration. Shingle exposures for wood roofs. This means for every 12 horizontal units the roof must rise a minimum of 3 vertical units.

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. Wood shingles can only be installed on roof slopes of 3 12 or greater 25 slope. Asphalt felt paper that is tacked to the roof sheathing.

The 2 12 number is rise over run or two units of vertical for every 12 units horizontal. Minimum required roof slope for roofing materials. Shingles of all types need to have a slope to function properly. Wood shingles minimum roof slope roof pitch r905 7 2.