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All Permavent membranes comply with new wind uplift regulations.

Significant changes have been made by the British Standards institution to wind uplift regulations within the BS 5534 – Slating and tiling for pitched roofs and vertical cladding – Code of practice.

These amendments have included an additional Annex (BS 5534: Annex A) which will affect the way the construction of slated and tiled roofs goes forward and is in effect as of 28th February 2015.

The most significant change relates to the use of roof underlays and their specifications. Roof underlays (Membranes; RTU’s etc.) are pivotal to the resistance of wind uplift across a roof and it is therefore important that they do not balloon and make contact with the roof tiles during wind conditions, as this will cause the tiles to lift or dislodge and fall off the roof.

To simplify understanding which underlay has the correct specification for wind loadings, British Standards have now added an additional annex to BS 5534 which includes a new wind uplift resistance test and classification system for underlays. This system classifies underlays for use in relation to the batten gauge being used and the geographical location of the project’s site.

A ‘Zonal-Classification’ label of this information must be provided by the manufacturer (i.e. Permavent) to enable the user to identify easily what underlay is suitable for a particular roof.

The new wind uplift resistance tests include the provision of a lap in underlay installation and have emphasized the importance of securing the laps to prevent them opening up and touching the roof tiles.

All of Permavent’s breather membranes comply with these new regulations for Wind Uplift and are suitable for all applications as described in BS 5534  when installed with taped laps as per fitting instructions.
As with British Standards, we believe sealing the laps is fundamental and the most effective way to do this is with a double sided membrane tape.
We have produced Permavent Permatac for this purpose, which provides excellent adhesive performance and longevity and is more cost/performance efficient than using counter battens.

In respect of the changes made to BS 5534, the NHBC have applied the following policy in for implementation:

“To ensure the new requirements are adopted in a timely fashion NHBC will apply a backstop of 1st July 2015 after which all roofs should be fixed in accordance with the revised BS 5534:2014.

To this end the following guidance will apply:

1) Roofing work already quoted and contracts agreed between the roofing contractor and main contractor – can be completed under the old version of BS 5534.

2) Roofing work not yet quoted and no contracts agreed – to be completed under the revised version of BS 5534:2014.

3) All roofing works as at the 1st July 2015, regardless of site size and number of phases – to be completed under the revised version of BS 5534:2014.

The above guidance is very much a backstop and NHBC’s approach is to encourage the adoption of the revised BS 5534 requirements at the earliest opportunity.”

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Newsflash

Following the success of the Queen’s award winning Easy Verge, here at Permavent we are proud to announce the launch of the recently developed Easy VergeTrim. This latest addition to the Easy Roof System has been specially designed to meet the requirements of the Scottish and refurbishment markets.