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What is the Air Permeability value for APEX?

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

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Where I can find my local supplier?

Click here to check where your nearest stockist is.   For any other enquiries please contact our sales office 01305 766 703.

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Are there any Permavent membranes suitable for all UK wind zones?

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.

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Building Control have instructed that I restrain the laps of the membrane – how is this achieved?

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 […]

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Can Easy slate be used with man-made slates?

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

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Can I hook fix with Easy Slate?

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

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Can I install Easy Slate with Rooflights?

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.

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Can I use Permavent APEX on a cold/warm roof application?

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

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Can I use Permavent APEX without any ventilation?

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.

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Can I use my usual brand of breathable membrane and still get the 40 year guarantee?

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.

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Can Permavent APEX be left exposed before roof slates/ tiles are installed?

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

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Can Permavent breathable membranes be left exposed before roof slates/ tiles are installed?

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

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Can you install Easy Slate or Plain Easy with reclaimed products?

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

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Can you use Easy Slate with random diminishing slates?

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

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Do I need to increase the headlap of the slate when using Easy Slate?

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

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Do I need to install a VCL when using Permavent APEX?

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

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Do I need to provide additional ventilation with a Permavent Vapour-Permeable Membrane?

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

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Does the Plain Easy system work with Valley / Hip Tiles?

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.

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Easy Valley Cap – Is the bolt-fixing installed at the top or bottom of the unit?

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

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How should I fix the membrane?

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

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I am concerned that Easy Slate raises my slate. Will wind-driven rain be an issue?

No, every roofing slate is protected by an Easy Slate unit, meaning that water cannot penetrate into the system via wind-driven rain.

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I am using Easy Slate with Fibre-Cement Slates, how do I install the Copper Disc Rivet / Crampion?

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

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I am using Permavent Vapour-Permeable membrane with Fibre-Cement Slates; should I install a counter batten?

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

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Is Permavent APEX cost effective?

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.

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Is a site visit / sign-off required for the guarantee?

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

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Is there a maximum rafter length when installing Easy Roof?

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.

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Is there a problem with Plain Tiles absorbing water and cracking in frost at lower pitches?

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

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Is your Easy Soaker range more cost-effective than lead?

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

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What UK wind zones is Permavent APEX suitable for?

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

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What is the drying out period?

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.

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What is the minimum pitch for Easy Slate within a location classed as ‘Severe Exposure’?

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.

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What is the minimum pitch for slates?

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

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What is the minimum pitch for tiles?

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°.

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What is the minimum recommended lap for APEX?

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.

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Which of your Verge products should I use on a boarded / sarked roof?

When installing onto traditional sarking boards with no additional slating battens, we advise that you use Easy Verge Trim.

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FAQs

We've put together some commonly asked questions to give you more information about Permavent and the products we offer.