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Double skin garage conversion walls insulation question….
I’ve had a quote for a conversion of a double skinned brick garage. The builder says that dot and dabbing insulated plasterboard direct to the brick will be sufficient and no need to stud out the walls. Is this likely to create any future issues? The garage is not attached to the main house and we are not making a habitable space (just essentially a garden office) so building regs are not applicable.
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14 Replies
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Personally id still go with a insulated stud wall with vapour barrier
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Moisture can travel through the board adhesive
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And you will have cold spots wherever the adhesive is
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I would still stud it out and insulate, especially for winter time, also in the loft space above aswell.
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I did my own 5 years ago and dot and dabbed on the double skin wall. No issues at all
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Should be fine, if you’ve got spare budget and space, go for the stud and extra insulation.
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If it’s double skin with a cavity why would you need to stud it out?
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Why aren’t building regs not applicable? Just gives you headache if the property needs to be sold. Whist getting sign off for regs can be a bit of a PITA, its 100% worth it.
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Would need to run it through either a designer or use the piv website for the insulation you intend to use.
You will need to know the cavity depth and fill
Just normal plasterboard and polystyrene insulation will never pass building regs.
Sounds like you’ve got someone that doesnt specialise in garage conversions.
Ask them what the u value for conversions should be min level.
If you need any advice call building control. The designer and installer should have proof that the insulation being used complies with current building regs.
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If you’re spending money on it, why not do it properly and get building regs. It will add value to your home and without them isn’t worth a penny more, in fact it could decrease the value as it’s classed as nothing.
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If its being heated and habitable it needs regs. You’ll be in a whole world of chasing your tail when you come to sell. Do it once, do it right, don’t pay twice.
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Is it a cavity wall with insulation or 9” masonry?
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the latter, don’t think there is a cavity
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For a double skinned wall what has been offered using dot & dab is standard form of construction. There will be no cold spots. Depending upon required usage you might want to use insulated backed plasterboard for a warmer room. Your choice to add additional insulation.
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