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by navyreg1970
Fri Aug 28, 2015 3:46 pm
Forum: Damp and Damp Proofing Forum
Topic: Venting Plasterboard Internal Wall After Insulation Now Causing Damp Spots
Replies: 4
Views: 17770

Re: Venting Plasterboard Internal Wall After Insulation Now Causing Damp Spots

Im a bit further along now (18 months) - I ended up cleaning up the efflorvescence spots and painted the wall with several coats of an oil based paint recommended for the task. We then decorated in normal emulsion. no problems for approx 1 year but I am now getting bubbling of the emulsion where the...
by navyreg1970
Wed Nov 06, 2013 8:07 am
Forum: Damp and Damp Proofing Forum
Topic: Venting Plasterboard Internal Wall After Insulation Now Causing Damp Spots
Replies: 4
Views: 17770

Re: Venting Plasterboard Internal Wall After Insulation Now Causing Damp Spots

I put two trial vents in - much to the dismay of my better half. One at the top right of the living room wall, one at the bottom left of the wall. A smouldering match at the top hole showed smoke being drawn in, a finger in the bottom hole showed a very slight cold draught coming out (had to wet my ...
by navyreg1970
Tue Nov 05, 2013 8:57 pm
Forum: Damp and Damp Proofing Forum
Topic: Venting Plasterboard Internal Wall After Insulation Now Causing Damp Spots
Replies: 4
Views: 17770

Re: Venting Plasterboard Internal Wall After Insulation Now Causing Damp Spots

it is an original wall. While you are correct on the fact that hot air rises, the opposite will happen with my proposed vent system. The cold air is more dense therefore it will sit lower in the cavity. with the wall vented top and bottom the dense cold air will drain causing a pressure drop at the ...
by navyreg1970
Fri Nov 01, 2013 2:39 pm
Forum: Damp and Damp Proofing Forum
Topic: Rising Damp Already Been Repaired and Now it's Come Back? Help
Replies: 4
Views: 3417

Re: Rising Damp Already Been Repaired and Now it's Come Back? Help

I have a similar issue with a cold internal wall. It has been covered by dot and dab plasterboard and I am getting damp where the dots and dabs are - as this is where there is a thermal bridge between the wall and the plasterboard. Warm humid air in the living room is condensing on these cold spots....
by navyreg1970
Fri Nov 01, 2013 12:54 pm
Forum: Damp and Damp Proofing Forum
Topic: Venting Plasterboard Internal Wall After Insulation Now Causing Damp Spots
Replies: 4
Views: 17770

Venting Plasterboard Internal Wall After Insulation Now Causing Damp Spots

I have recently renovated a victorian single skin brick built farm house. Building control made me insulate the inside of all the external walls to current insulation standards as I had removed more than 50% of the old plaster. Now that the rooms are better insulated and the external walls have lost...
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