Permavent APEX air permeability value is >36.72m3/m2h50Pa. 

Permavent products are stocked across the country in a wide range of builders' merchants and wholesale locations. Read more about our Stockist Finder.

All Permavent membranes are suitable to various areas and projects, but several are suitable for all UK wind zones.

In accordance with BS5534 the laps of a roofing underlay can be restrained in 3 ways. Click Further Info to read more.

Yes, the uniform properties of fibre-cement slates work effectively when installed with Easy Slate.

Yes, Easy Slate can be installed using traditional hook-fixing methods.

Yes, the Easy Roof System can be installed unaffected by the addition of rooflights. Please seek guidance from the rooflight manufacturer as to the minimum pitch when using their products.

Yes, Permavent APEX can be installed in both applications. For more complex roofs please speak with our technical department.

Permavent APEX complies with NHBC requirements for cold/warm roof constructions without the need for any high or low level ventilation under the NHBC warranty.

No, in order to qualify for the 40 year guarantee the membrane used must be Permavent DRY+. Read on for further stipulations.

Yes, it can. Permavent APEX is UV stable for up to 3 months. 

Yes, Permavent construction membranes are UV stable up to 3 months and water resistant.

Yes, Easy Slate and Plain Easy along with the Easy Roof System as a whole can be used alongside reclaimed products in historical renovations or replacement roofs.

Permavent can offer off-the-shelf and bespoke solutions for this application.

Plain Easy separates the tiles from one another and significantly reduces the chances of cracking due to freeze-thaw action.

No, Easy Slate can be installed using traditional slate headlaps.

A VCL is not required for non-ventilated cold roof installation.  For further design support please contact a member of the team. 

Different membranes have differing requirements when it comes to ventilation. Please speak with a member of the technical team, who can help you find the right product for your design.

Since valley and hip tiles are manufactured to be used at standard pitches rather than low pitch the Plain Easy system would not be required.

Permavent roofing underlays should be affixed using clout nails. It's important that the nails are located beneath laps, to ensure that the underlay prevents water penetration.

No every slate is protected by the Easy Slate System, and water ingress is stopped even from wind-driven rain.

Yes – please see image of copper disc rivet application with Easy Slate.

Yes, in accordance with guidance provided by BS5250 and fibre-cement slate manufacturers.

Permavent APEX is extremely cost effective thanks to a unique integrated tape system that reduces waste, time and labour.

A site visit is not a requirement for the guarantee, but images of the project before, during and after completion are necessary alongside the guarantee application. Read more about the Easy Roof System and Diamond GRP guarantees by clicking here.

Please install Easy Valley with the fixing that holds the cap in place at the higher end of the strip.

When pitched at 12 degrees, Easy Slate is approved for use with a maximum rafter length of 8 metres.

Yes, Easy Soaker provides a cost-effective replacement for traditional lead flashing.

Permavent APEX is suitable for use in zones 1-5 (taped lap) and zones 1-3 (batten-restrained ≤345mm batten gauge).

The drying out period is the period over which the building dries. The building will have collected moisture during construction, especially if there has been inclement weather, as well as the materials themselves retaining some moisture. Once the membrane and roof is installed the internal area will begin to dry. This period can very in […]

As referenced in the Permavent BRE wind driven rain test report 273-259, Easy Slate is tested and approved as low as 12 degrees within areas of severe exposure.

Easy Slate allows slates to be installed as low as 12°.

Minimum pitch recommended in BS 5534: 35° Plain Easy allows plain tiles to be installed as low as 17.5°

The majority of breather membrane manufacturers recommend installing their membranes with a 150mm lap (225mm for lower pitches). Permavent APEX Taped with double-integrated tape, has been tested and approved for installation with a 100mm membrane lap.

When installing with no additional slating battens we advise using Easy Verge Trim.