Garage conversion botched job
Discussion
Hi all
New member here hoping to get some advice on a botched garage conversion.
My builder converted part of garage into utility. This is 2.8m x 3m. The garage has a single skin external wall. He updated this wall with dot and dab xps insulated plasterboard Knauff 50mm. Building control say this is too thin. I am looking at a big job ripping this wall upgrade out and redoing with 100mm timber batten + cellotex insulation. Does anyone have a better solution? The build passes condensation analysis but works out to 0.65 u value.
To satisfy building control i need 0.35 max. Any pointers at all?
New member here hoping to get some advice on a botched garage conversion.
My builder converted part of garage into utility. This is 2.8m x 3m. The garage has a single skin external wall. He updated this wall with dot and dab xps insulated plasterboard Knauff 50mm. Building control say this is too thin. I am looking at a big job ripping this wall upgrade out and redoing with 100mm timber batten + cellotex insulation. Does anyone have a better solution? The build passes condensation analysis but works out to 0.65 u value.
To satisfy building control i need 0.35 max. Any pointers at all?
Thank you for the very useful pointers. I did have a design but forgot i need to check the builder is actually following it. They put this up in a day and I didn’t stay on ball.
Will this build cause problems down the line? I mean it maybe better to bite the bullet , rip it out and start again to do it properly? I did get knauff to do calculations and it said condenssation clears out in summer so guess technically i wont have an issue.
Will this build cause problems down the line? I mean it maybe better to bite the bullet , rip it out and start again to do it properly? I did get knauff to do calculations and it said condenssation clears out in summer so guess technically i wont have an issue.
PhilboSE said:
Your builder is an idiot, I’m afraid. Current regs would need 150mm PIR (Celotex / Kingspan / Quinntherm etc). So that’s 6” x 2” stud work with PIR between, vapour control layer, plasterboard.
It’s possible you (he) could re-use the existing materials if it’s thought about carefully - 4”x2” studwork with 100mm PIR then the existing treatment on top of that.
Agree - he is an idiot. The annoying thing is if he had used 100mm xps instead of 50mm then it would have met the u value reqs. It’s possible you (he) could re-use the existing materials if it’s thought about carefully - 4”x2” studwork with 100mm PIR then the existing treatment on top of that.
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