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.

Minimum slope for concrete tile roof.

Boral concrete tiles are manufactured using an extrusion process. Concrete is long lasting with a minimum lifespan of 50 years depending on climate. The irc recommends a minimum pitch of 2 5 12 for these materials. When the roof angle is less than 30º the windward slope can be subjected to severe suction or negative pressure fig 4.

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 short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. Both clay and concrete tile are available in many colors and are naturally weather resistant. This means for every 12 horizontal units the roof must rise a minimum of two and one half vertical units.

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. Clay tiles are colorfast which means their tints improve rather than fade over time. In general the minimum slope for a tile roof is 3 12.

In general there is no maximum slope for tile roofs. 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. However on extremely steep roofs above 19 12 or on vertical applications wind currents may cause tiles to rattle. The underlying roof provides all the necessary waterproofing.

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 minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems. A frame roof a steep pitched gable roof each slope extending from close to the ground line to meet at the top ridge. Asphalt shingles continue to be the most widely installed roof covering option in north america.