Slate Roof Pitch Change

Conclusions of the low pitch slate roof testing.

Slate roof pitch change.

Download this free 2d cad block of a typical slate change of roof pitch detail including annotations and dimensions. You consider some alternative solutions. The slope of a roof is often referred to as the roof s pitch. 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 agreed that the roof pitch should be a minimum of 20 degrees preferably a bit more. 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. 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. 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. Generally a slate roof is not installed on a pitch less than 4 12. Even a slight change in pitch can have a variety of consequences depending on the roof.