Slate Roof Pitch Change

A dramatic change in pitch will affect the way the roof looks the way water runs off of it and much more.

Slate roof pitch change.

Conclusions of the low pitch slate roof testing. Even a slight change in pitch can have a variety of consequences depending on the roof. 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.

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. 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. The slope of a roof is often referred to as the roof s pitch. This autocad detail can be used in your roof design cad drawings.

You consider some alternative solutions. As per the nrca roofing and waterproofing manual fifth edition they recommend that roof deck slopes intended for the application of steep slope materials at 4 12 18 degrees or greater page 405. Generally a slate roof is not installed on a pitch less than 4 12.