Minimum Pitch Plain Clay Roof Tiles

What is the minimum roof pitch for plain roof tiles.

Minimum pitch plain clay roof tiles.

Particularly for first floor extensions. Clay pantiles 30 degrees. 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. Interlocking clay plain tiles 15 degrees.

Plain tiles 35 degrees. As a general rule tiles and slates will perform down to the pitches outlined below. Concrete is long lasting with a minimum lifespan of 50 years depending on climate. 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 irc recommends a minimum pitch of 2 5 12 for these materials. Clay single camber plain tiles can pitch down to 30 manufacturer dependant although the vast majority available have a limit of 35. Guidelines for roof sections falling below a 35 pitch. 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.

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 style of a roof tile will not dictate the pitch it can be used for as this will depend on the actual design. Ratios from that minimum up to 4 12 which are considered low pitch require double underlayment.