•     Permavent Max All Zones - High performance breathable membrane
•     Suitable for all wind zones regardless of fitting method
•     Conforms to BS5534
•     LABC registered
•     3 layers membrane
•     UV stable for 3 months
•     For use on any types of roofing/walling applications
•     Available in 1m x 50m

Permavent breathable membranes must be installed in accordance to BS 5534 Code of Practice. The installer must ensure compliance with the relevant building
regulations.
Our membranes are designed as a secondary barrier to wind driven rain / snow and should not be considered a primary waterproofing layer. Whilst they can
withstand UV exposure for up to 3 months, it is best practice to install the primary waterproofing finish (e.g. slates, tiles etc) as soon as possible.
Permavent membranes must be installed the correct way up, with the Permavent logo printed side uppermost.
For tile and slate roof applications the membrane should be laid horizontally across the rafters starting at the eaves and secured in place with either batten or
membrane tape.

 Recommended Overlap

The below table shows you the coverage you will need of our breathable membrane using the square metre of your roof area.  Based upon an industry standard headlap of 150mm. 

Specifications

Permavent membranes are suitable
for use in all applications as described
in BS 5534.
For use on all types of domestic and
commercial roofing and walling
applications, including:

• COLD NONVENTED
• TRADITIONAL HYBRID
• COLD VENTED
• SCOTTISH AND FULLY
• BOARDED APPLICATION

NB, for more complex roofs, or where you have detailing; you will use more membrane:

• Ridge lines - on a duo-pitch roof, the membrane overlaps 150mm on both elevations. 
• Abutments (Wall/Chimneys) - the membrane continues up the vertical a min 75mm. 
• Valleys- you will utilise more membrane depending on the complexity.