Slate Roof Pitch Change

It is agreed that the roof pitch should be a minimum of 20 degrees preferably a bit more.

Slate roof pitch change.

Generally a slate roof is not installed on a pitch less than 4 12. You consider some alternative solutions. The slope of a roof is often referred to as the roof s pitch. When a roof s ridges walls and rafters are switched out there is a chance to create a new architectural design that can change the pitch of the roof.

Even a slight change in pitch can have a variety of consequences depending on the roof. A couple of likely slate suppliers are consulted and they confirm that they are happy to supply 600x300mm slates for a minimum roof pitch of 20 degrees assuming a minimum lap of 125mm. 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. Following the successful test results we are happy to advise specifiers and contractors that they can choose a siga natural slate roof as low as 15 degrees sheltered or moderate exposure and 17 5 degrees severe exposure if the slates are hook fixed with a 150mm lap.

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. This autocad detail can be used in your roof design cad drawings. Conclusions of the low pitch slate roof testing.