As you know, Permadeck bonds to the plywood decking, which effectively becomes part
of the waterproofing system. This stops water being able to run between the membrane
and the deck. To get a leak you would need to have a hole not just in the Permadeck
but through the plywood too.
The plywood must be 100% dry to get a bond. If your ply gets wet it cannot be dried
on the day of installation.
This 18mm structural FSC ext wbp plywood is resin coated on its upper face making
it temporarily impervious and is ideal for the top layer on both warm roofs and cold
deck applications. Other thicknesses are available to special order.
So, once you’ve ordered your Permadeck installation let us know how many 8x4 sheets
of DryPly™ you require (~1 per 3 sqm) and when you want them delivered. They can
also be collected from our two yards, but please give us some notice as stocks can
fluctuate. Having laid your DryPly™ you can duct-tape the board joints to minimise
DryPly™ is only available as a component of the Permadeck® system.