Minimum Slope For Concrete Tile Roof

Both clay and concrete tile are available in many colors and are naturally weather resistant.

Minimum slope for concrete tile roof.

Boral concrete tiles are manufactured using an extrusion process. However on extremely steep roofs above 19 12 or on vertical applications wind currents may cause tiles to rattle. Concrete is long lasting with a minimum lifespan of 50 years depending on climate. And our brand new mendip 12 5 can be used at an even lower pitch of 12 5 restrictions on rafter length may apply.

The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. In general the minimum slope for a tile roof is 3 12. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. Clay tiles are colorfast which means their tints improve rather than fade over time.

Roofs steeper than 35º generally present sufficient obstruction to the wind for a positive. A frame roof a steep pitched gable roof each slope extending from close to the ground line to meet at the top ridge. Low slope applications will require a carefully detailed waterproof membrane for example a self sticking bituminous membrane under the tiles. The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.

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 two and one half vertical units. If a customer insists on installing roof tiles on a roof with a pitch below 3 12 consult the tile manufacturer for installation specifications. When the roof angle is less than 30º the windward slope can be subjected to severe suction or negative pressure fig 4.

In general there is no maximum slope for tile roofs. 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 irc recommends a minimum pitch of 2 5 12 for these materials. The underlying roof provides all the necessary waterproofing.