With the Permavent Easy Slate it is now possible to use any type of slate on many different styles of building where it was not previously possible.
For example, the pitch of a ‘lean-too’ extension can be restricted by the window of the upper floor. The further out the extension then the lower pitched angle of the roof must be. With much of Britain designated as ‘severe exposure’ standard 500x250mm slates are restricted under BS 5534 to a minimum pitch of 30 degrees and this would restrict the average extension to just over 2 metres long.
The height of many new buildings are controlled and the reduction of the pitch can now be offered as a solution to this problem, with the added bonus that the roof will have less slates resulting in less weight as well as offering a cost saving.
Easy Slate has undergone extensive testing by the Building Research Establishment (BRE). The Easy Slate was tested at a pitch as low as 12 degrees and is the only roofing product to pass this test with no leaks at all. Permavent guarantee the Easy slate system for 40 years subject to it being installed in line with their fixing instructions and being used in conjunction with the Dryroof Breathable Membrane
