Minimum Slope For Concrete Tile Roof

The irc recommends a minimum pitch of 2 5 12 for these materials.

Minimum slope for concrete tile roof.

When the roof angle is less than 30º the windward slope can be subjected to severe suction or negative pressure fig 4. And our brand new mendip 12 5 can be used at an even lower pitch of 12 5 restrictions on rafter length may apply. Asphalt shingles continue to be the most widely installed roof covering option in north america. The underlying roof provides all the necessary waterproofing.

Low slope applications will require a carefully detailed waterproof membrane for example a self sticking bituminous membrane under the tiles. Minimum roof slope roof pitch r905 3 2 clay and concrete roof tiles can only be installed on roof slopes of 2 1 2 12 or greater. 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.

Roofs steeper than 35º generally present sufficient obstruction to the wind for a positive. Fixing tile roofs in cyclonic regions 15 minimum roof pitch 15 maximum rafter lengths 15 maximum rafter lengths no sarking 15. A frame roof a steep pitched gable roof each slope extending from close to the ground line to meet at the top ridge. In general there is no maximum slope for tile roofs.

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. Concrete is long lasting with a minimum lifespan of 50 years depending on climate. 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. In general the minimum slope for a tile roof is 3 12. The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems. If a customer insists on installing roof tiles on a roof with a pitch below 3 12 consult the tile manufacturer for installation specifications.