Shallow Pitch Roof Slates

Higher exposure or different sized slates necessitated a greater roof pitch of 22 5 or more.

Shallow pitch roof slates.

Conventional low pitch slate roofs are recommended down to a minimum of 20 in areas of sheltered or moderate exposure providing a 500x300mm slate is used and a headlap of 115mm. In order to provide you with the opportunity to specify low pitched slate roofs below 20 with confidence siga commissioned the bre to carry out a set of tests. The rules can occasionally be broken but generally you should not exceed the low range of the recommendation. Headlap is typically 3 inches but could be 2 inches on a very steep slopes or 4 inches on very shallow slopes page 247 slate pitch greater than 20 12 2 headlap 20 rise per 12 run 59 04 angle of incline.

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. The part of the lapping system where there are three layers of slate. 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. If you are looking for roof tiles designed specifically for low pitch shallow roofs then your choice is very limited.

The tiles and slates used for low pitched roofs are very low maintenance and will always come with a manufacturers guarantee for at least a few decades. There are even some that will go down to 10 providing certain very specific conditions are met. For example wood and slate shingles might work for roofs steeper than the top recommendation of 12 12 but you should not install them below the 4 12 lower range. Some concrete based tiles will go down to 15 and a few will even cope well with being laid on a 12 5 pitch.