Grey Granulated Roof Tiles » Permavent Max All Zones Breathable Membrane
£60.00 Excludes VAT
Work out how many tiles you need for your roof conversion
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.
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 |
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:
NB, for more complex roofs, or where you have detailing; you will use more membrane:
“ Thank you to LightWeight Tiles in Lydney my dream is heading to reality. After buying a garden room with my share of inheritance money after losing my mother. I was so upset at the quality I was distraught. Lightweight tiles came to the rescue. Not only did the team in the office – Susan and Carol help us with the estimate and order, but we were shown how the tiles are produced and got to meet the whole team, who were really informative and helpful.
As a bonus Charlie and Josh even spent a couple of evenings after work putting the tiles on for me. The glazing is almost complete, and it is so lovely and warm that I can’t wait to spend more of my time relaxing inside, remembering my Mum in a lovely environment. Thank you so much
”
- Bet C. , Lydney