Insulation

Cold Wall in Bathroom

Anonymous user 03/03/2024 - 3.38 PM

Hi, I have a problem with the outside wall in the bathroom of a Victorian house. Most of this wall has a tiled stud wall 20 cm in front of it, but around the window there is a 1.2m by 1.2m area that is just the solid wall. This gets very cold in winter and lots of water is condensing on it when one takes a shower. There is no issue with damp as such, the wall itself appears dry and the room dries out if the fan runs long enough, but the surface condensation has destroyed the paint on this part of the wall. We want to redo the bathroom and would like to put some insulation on this part of the wall to reduce the condensation. But we do not want to change the fundamental layout of the bathroom. The insulation including plaster should not be thicker than about 50 mm. During the work, we will take down part of the stud wall. Here are my questions: What type of insulation can be used; do I have to worry about moisture creeping into the wall if I put insulation on; and do I have to worry about the edges where the stud wall meets the insulation. As it is now there are little cracks in these edges and with no attention paid to insulation behind the stud wall either, there is cold air blowing through the cracks. I appreciate your advice. Jan

Prime Plumbing & Heating

Rating: 4.5 out of 5

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Romsey

Hi Jan, I’d suggest when taking the wall down ensuring there are no holes in outside wall and that between outside wall and stud wall it is insulated correctly. Possibly when one takes a shower there is a leak on the shower waste in the stud wall. Lewis

Answered17 April 2021

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Handimen (Home & Garden)

Rating: 4.8 out of 5

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Tunbridge Wells

Hi In situations like this, I tent to fit “Wallrock kv600” A 4mm insulation paper Applied with a small tub of thermal liner paste. Fill gaps with caulk king Once dry, use Wallrock fiver liner (a heavy duty lining paper) Instead of standard paste, use a moisture resistant past (Best in bathroom/ kitchens) Lightly fill joins and then paint with Zinsser anti mould paint Generally works a treat, and less disruptive. Available vi Brewers decorating centre or on line via Gowallpaper Hope this helps

Answered30 April 2021

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Right Price Builders

Rating: 5 out of 5

5/51 review

Plymouth

Hi Jan, I would advise you to render the cold wall with Insulating Lime Render. It comes in a Drymix and is easy to apply. Thereafter you can plaster with lime plaster or just paint it with a breathable paint. You will have to use a fixative before painting but the wall would then breathe and you would have no issues with paint foeing and peeling. I fear if you batten out and plasterboard it without employing a 25mm vapour barrier you will still get spoilation of the paintwork where cold bridging occurs.

Answered7 May 2021

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