Slope For Tile Roof

Clay and concrete roof tiles can only be installed on roof slopes of 2 1 2 12 or greater.

Slope for tile roof.

To calculate roof pitch take the lowest point of the roof and measure the amount of rise for every 12 inches of horizontal movement toward the highest point. In general there is no maximum slope for tile roofs. Express the slope of a metal roof by a ratio which indicates the pitch of the roof. If a roof increases in height by four inches for every foot of horizontal run it is considered to have a 4 in 12 pitch or just a 4 pitch talk in terms of pitches and you will always be understood in the roofing universe.

Shingle roofs typically have a life span of 15 30 years while membrane roofs usually last 5 15 years. This forms an angle of 18 5 between the horizontal section and the roof and creates a gentle incline that is seen as a midpoint between a low pitch and medium pitch roof. A 4 12 is a roof slope that rises by 4 inches for every 12 inches across. You need to consider the slope requirements of each panel to determine this minimum slope.

However on extremely steep roofs above 19 12 or on vertical applications wind currents may cause tiles to rattle. Sunday july 1 2018 the international residential code irc specifies a minimum 4 12 pitch 4 inches of vertical rise for every 12 inches of horizontal run for a clay or concrete tile roof except that a pitch as low as 2 1 2 12 is allowed when two layers of underlayment are applied. The profile is the shape taken by the sheets when you bend them to form panels. To avoid this use wind clips on each tile along with a construction grade silicone sealant or other approved sealant.

It is uncommon to find a roof below 15 but for those very low pitch applications there are interlocking clay pantiles available suitable for use down to 12 5. The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems. Roof pitch is the measurement of a roof s vertical rise divided by its horizontal run. Also if clay and concrete roof tiles are installed on a roof slope of 2 1 2 12 to 4 12 it shall be provided with a double underlayment application.

This means for every 12 horizontal units the roof must rise a minimum of two and one half vertical units. Traditionally a minimum roof pitch of 20 was recommended in bs 5534 but modern tiles and slates have now been designed for applications as low as 15. So the pitch of a roof is determined by how many inches the slope rises for every 12 inches it runs horizontally. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code.

For example a roof that rises 3 inches for every 12 inches has a pitch of 3 12.