Minimum Slope For Concrete Tile Roof

Roofs steeper than 35º generally present sufficient obstruction to the wind for a positive.

Minimum slope for concrete tile roof.

The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. However on extremely steep roofs above 19 12 or on vertical applications wind currents may cause tiles to rattle. Our wessex and mendip concrete roof tiles can be used down to a minimum 15 pitch. Clay tiles are colorfast which means their tints improve rather than fade over time.

Concrete is long lasting with a minimum lifespan of 50 years depending on climate. Low slope applications will require a carefully detailed waterproof membrane for example a self sticking bituminous membrane under the tiles. Asphalt shingles continue to be the most widely installed roof covering option in north america. Boral concrete tiles are manufactured using an extrusion process.

If a customer insists on installing roof tiles on a roof with a pitch below 3 12 consult the tile manufacturer for installation specifications. 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. This means for every 12 horizontal units the roof must rise a minimum of two and one half vertical units. A frame roof a steep pitched gable roof each slope extending from close to the ground line to meet at the top ridge.

The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. The underlying roof provides all the necessary waterproofing. The irc recommends a minimum pitch of 2 5 12 for these materials.

Both clay and concrete tile are available in many colors and are naturally weather resistant. And our brand new mendip 12 5 can be used at an even lower pitch of 12 5 restrictions on rafter length may apply. In general there is no maximum slope for tile roofs. In general the minimum slope for a tile roof is 3 12.