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.
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.
A dramatic change in pitch will affect the way the roof looks the way water runs off of it and much more.
Even a slight change in pitch can have a variety of consequences depending on the roof.
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.
Generally a slate roof is not installed on a pitch less than 4 12.
You consider some alternative solutions.
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.
It is agreed that the roof pitch should be a minimum of 20 degrees preferably a bit more.
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.