Search found 2 matches

by Alph
Tue Sep 30, 2008 2:09 pm
Forum: Damp and Damp Proofing Forum
Topic: please help....with ? white furry stuff
Replies: 3
Views: 37552

efflorescence is the white stuff you see on new external brickwork after it rains, it goes eventually. The hairy inside stuff is salt crystals growing from ground salts which have come into the walls and plaster from outside via the ground moisture. Its a sign of damp penetration. Even if you seal o...
by Alph
Tue Sep 30, 2008 1:52 pm
Forum: Flat Roofing Forum
Topic: 12mm WBP exterior plywood - how much rain can it stand ?
Replies: 2
Views: 18393

I ran a roofing business for years. There was a trend a few years ago on big commercial projects to indeed leave the old felt on and cover with new over the top as this saves a lot of time and money. But most reputable manufacturers wont guarantee their systems unless all the old stuff is removed or...
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