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22/03/21 We are open and operating as usual, lead times have been reduced to a maximum of 7 days for dispatch.

Permavent Max All Zones Breathable Membrane

Grey Granulated Roof Tiles » Permavent Max All Zones Breathable Membrane

permavent max main 002
permavent max main 002

£60.00  Excludes VAT

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We aim to dispatch this product within 7 days (depending on availability).

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  •     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. 

Rafter Pitch Not Fully Supported Fully Supported
12.5° - 14° 225mm 150mm
15° - 34° 150mm 100mm
35° and above 100mm 75mm


Specifications

Weight, g/m2

150

Water tightness, class

W1

Water vapour transmission (sd),m

0.02

Maximum tensile force (MD), N/50mm

350

Maximum tensile force (CD), N/50mm

240

Elongation at max. tensile force (MD), %

70

Elongation at max. tensile force (CD), %

70

Resistance to tearing MD (nail shank), N

140

Resistance to tearing CD (nail shank), N

230

 

 

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.

 

“ Good Evening.
I thought you might like to see some of the sheds in my garden that have been re-roofed with your lightweight tiles. In some of the pictures, you can see how use has been made of your eaves guard as a sill for the glazing units.
You have a first class product and I would recommend it, At 75 years old I was able to re-roof all of the sheds my self as they are so light and easy to use. As you can see there is one more shed to be done, and with a few leftovers from the other sheds, I was able to make a shelter for the robo mower!
A pleasure to do business with you all.
Regards,”

- David.P. , Gloucestershire

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