garage conversion single wall thermal/damp proofing

Postby yarrum041171 » Tue Feb 24, 2009 8:48 pm

converting attached garage to a play room outside wall is single brick...........building control have told me i have to seal my single brick outer wall with i think insultec paint ?. does anyone know where to get or is thier an alternative,then 2" air gap then kingspan insulation board then stud wall with plaster board with insulation on the back this sounds very extreme was going to follow what has been put on this site.... help .....
frustrated engineer
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Simply Build It

Postby stoneyboy » Sat Feb 28, 2009 2:43 pm

Insulating the garage to current standards is something you will have to do, the actual way you achieve the required U value is up to you. For example if you are incorporating an existing sg window then the wall U value would have to be higher to compensate.
I would doubt the need for sealing the outer brickwork since you are forming a cavity. Suggest you use a specialist to check the information you have been given by the BI.
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Postby Perry525 » Sat Feb 28, 2009 6:56 pm

They are just doing their job and trying to save you money.
Trying to heat a space with a single brick wall will cost you a fortune!
Their idea is to coat the wall with a product that will help it to shed the rain and keep the wall dry.
Their proposal is not very sound as the wood studding will be cold at the back and will attract water vapour that will cause it to rot in time. Unless it is preserved in some way.
The wood will be the weak link acting as a heat bridge and funneling the heat from the room into the cold outer wall.
The insulation between the wood will help keep the room warm, but will also ensure the wood is cold and wood needs to be warm to keep dry.
A better bet would be to buy a ready made product where the insulation is already attached to the plasterboard and stick it direct to the brick wall.
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