Insulated board on a existing house.

Dupont · 04-01-2022 8:58pm #1

Hi all we are renovating the living room and going to put an insulated plaster board on ceiling and inside of any exterior walls. House is a bungalow built in the 1990s , face brick, 100mm cavity, 40mm white polystyrene insulation, 100 mm concrete block inside. About 100mm fibreglass insulation on the joists. I was wondering what thickness of slab for ceiling and walls people recommend.

Yellow_Fern · 05-01-2022 3:51pm

Did you ask the maker of the insulated plasterboard to do a condensation risk analysis?

Dupont · 05-01-2022 7:44pm

https://www.boards.ie/discussion/comment/118421748#Comment_118421748

No I didn’t. Should I ?

Yellow_Fern · 07-01-2022 11:51pm

https://www.boards.ie/discussion/comment/118422896#Comment_118422896

Depends on a few things. It is really interstitial condensation that is of concern. Particularly if the wall is cold and you are creating a void between it an your new wall. I am not saying you get condensation there, just good to ensure there is no risk.

Dupont · 09-01-2022 12:38am

https://www.boards.ie/discussion/comment/118436886#Comment_118436886

Yea I’ve heard about mould being a problem when “dot and dab” boards onto walls. I was going to just put them tight to the wall and fix using steel mushroom fixings

Insulated board on a existing house.

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