I'm going to be using some bitumen-based damp-proof membrane on a wall
soon; instructions on the tin say that after application I will need
to 'blind' it with sand while still tacky; but doesn't go into any
more detail. What exactly is involved in this? Do you just chuck
dry sand at the wall so it will stick where there are any sticky
areas? Presumably you don't use any form of implement to smooth the
Blinding is like sprinkling carborundum onto stair treads to make them non
slip. It's normally blown on with a wide hose thing. A bit like an upright
vacuum cleaner but where the bag goes is where the sand is blown out.
You only need to give it a sand coating if you are going to apply a render
over it. The sand gives it a key to help the render grip
Usual way was to apply 2 coats synthaprufe or similar and as soon as the
second one is applied throw river washed sand at it
Thanks... well, it's actually in an outside workshop that I'll be
doing this; so the only reason to render would be to protect the
membrane from mechanical damage, which according to the tin can
apparently happen easily. But I haven't a clue how readily damaged
this stuff actually is; I'd really rather not render it unless
absolutely necessary... anybody experienced with using it?
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.