I want to fix plasterboard with insulation attached ('crunchy board'?) on to a single skin external brick wall using the dot and dab (?) method. The wall does had some damp coming in from outside which I have treated externally with Thompson's Water Seal.
Should I treat the inside surface of the brick wall with some sort of waterproofing before sticking on the plasterboard given that I can't use an internal polythene layer? Would this cause problems with condensation?
If I should/can waterproof, what product should/can I use? Is there one that is breathable?
If the room is to be used for domestic purposes you must form a ventilated cavity between the outer wall and the lining. Sticking foam backed plasterboard direct into the wall will soon give condensation problems with water coming out at the lower edge of the plasterboard.
Last year 64% of the questions asked in our forum were answered within our DIY project pages at www.diydoctor.org.uk/projects.htm The project pages are now separated alphabetically and your answers are accompanied by diagrams and the ability to see, and buy, the tools and/or required to complete your project. Use our search box to look for your answer and save a great deal of time and money!
DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!