Minimum Roof Pitch For Clay Tiles

The irc recommends a minimum pitch of 2 5 12 for these materials. All tiles and slates have a minimum roof pitch which is set out in order to protect the roof from water penetration. This minimum pitch is important if tiles are laid below the recommended minimum pitch there is an increased chance of water getting through which can damage the underlay and battens over a prolonged period.

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Clay and concrete tile requires a minimum roof pitch of 2 1 2 12 or greater.

Minimum roof pitch for clay tiles.

Clay tiles are colorfast which means their tints improve rather than fade over time. For many years 20 was recommended as the minimum pitch for clay tiles but this has decreased in the modern era down to 15. Mineral surfaced roll roofing requires a minimum roof pitch of 1 12 or greater. Guidelines for roof sections falling below a 35 pitch.

Concrete is long lasting with a minimum lifespan of 50 years depending on climate. Metal roof shingles require a minimum roof pitch of 3 12 or greater. All tiles have a minimum roof pitch which is always stated in the manufacturers technical information. Anything lower than this angle is rare and although there are specific products that can go lower 15 is the most common minimum angle for clay tiles.

Traditionally a minimum roof pitch of 20 was recommended in bs 5534 but modern tiles and slates have now been designed for applications as low as 15. It is uncommon to find a roof below 15 but for those very low pitch applications there are interlocking clay pantiles available suitable for use down to 12 5. The minimum pitch for each product can be found in the table below and in the product brochure or within the products pages some tiles and slates incorporate design features allowing them to be laid at a low minimum pitch. Ratios from that minimum up to 4 12 which are considered low pitch require double underlayment.

On some developments design limitations can arise on comparatively small areas of the roof which restrict the available roof pitch to below 35 which is the minimum pitch recommended for all plain tiles in bs en 5534.