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

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The following Permavent membranes are suitable for all UK wind zones, when installed in accordance with BS5534: BLACK, GRAPHITE, MAX ALL ZONES, RED, DRY & APEX Air Permeable.

In accordance with BS5534 the laps of a roofing underlay can be restrained in 3 ways: 1. Restrained with an integrated or external tape. 2. Restrained with a ‘fly’ batten. 3. Restrained using the existing tile/slate batten line. The most cost-effective and quality-assured way of achieving this is by installing a roofing underlay with a […]

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 remains uneffected by the addition of rooflights – please seek guidance from the rooflight manufacturer for 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.

To achieve the Easy Roof Guarantee, the following products must be used: Easy Slate / Plain Easy + Permavent Dry + Permalap Tape. When installed on a fully supported roof, e.g sarking board, Permavent RED + Permatac tape should be installed.

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

Yes, it can. Permavent membranes are UV stable for up to 3 months. 

Yes, providing the integrity of the slate or plain tile meets the criteria set out in BS5534 and is fit for purpose.

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

No, Easy Slate can be installed using traditional slate headlaps. Please see our fitting instructions for further information.

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

Please speak with a member of the technical team, who will provide the correct product for your design.

Valley and hip tiles are manufactured to standard pitches, rather than low-pitch. Therefore, alternative detailing is recommended, please speak to one of the technical team for further information.

Please install the Easy Valley with the valley cap fixing at the top.

Clout nails should be used to fix Permavent roofing underlays and located beneath laps to prevent water penetration.

No, every roofing slate is protected by an Easy Slate unit, meaning that water cannot penetrate into the system via 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 the most cost effective Air-Open membrane on the market. The reduced lap (100mm) will decrease the membrane usage. The unique integrated double tape system will save time and labour, as well as eliminating the need for restraining battens or additional ‘fly’-battens.

Please provide clear site images, before, during and after installation to accompany your Easy Roof guarantee application.

At 12 degrees, Easy Slate is approved for use with a maximum rafter length of 8 metres. Please speak with the technical team if you have any further questions.

Due to Plain Easy separating the layers between the plain tiles, the occurence of cracked tiles via freeze-thaw is heavily reduced.

Yes, the material and labour savings are significant, with savings of up to 80% achievable.

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 when all the moisture in the building is drying out, including moisture in building materials and any moisture that find its way in. The air and vapour permeable properties of APEX helps with the condensation during this period.

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.

The Easy Slate System will allow natural or man-made slates to be installed as low as 12°.

The minimum pitch for tiles is recommended 35° (BS 5534). The Plain Easy System will allow 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 onto traditional sarking boards with no additional slating battens, we advise that you use Easy Verge Trim.