Minimum Slope For Concrete Tile Roof

The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.

Minimum slope for concrete tile roof.

If a customer insists on installing roof tiles on a roof with a pitch below 3 12 consult the tile manufacturer for installation specifications. Concrete is long lasting with a minimum lifespan of 50 years depending on climate. However on extremely steep roofs above 19 12 or on vertical applications wind currents may cause tiles to rattle. In general there is no maximum slope for tile roofs.

In general the minimum slope for a tile roof is 3 12. 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. Boral concrete tiles are manufactured using an extrusion process. Fixing tile roofs in cyclonic regions 15 minimum roof pitch 15 maximum rafter lengths 15 maximum rafter lengths no sarking 15.

When the roof angle is less than 30º the windward slope can be subjected to severe suction or negative pressure fig 4. The underlying roof provides all the necessary waterproofing. The irc recommends a minimum pitch of 2 5 12 for these materials. 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. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. Roofs steeper than 35º generally present sufficient obstruction to the wind for a positive. 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.

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. 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.