We have been informed by our private building control firm that our walls and ceilings must achieve a u value of 0.18. I was under the impression that was the recommended for windows and doors. We are now having to fit 100mm inbetween the joist and covering with a 40mm K7 this seems a bit belt and braces to me.....or is it just me?
U values for loft conversion
- Thread starter handyman77
- Start date
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Yes ceiling is 0.18 and 100 Kingspan between and 40 under is required.
Walls are 0.28 and 90 between the studs will get you there.
Walls are 0.28 and 90 between the studs will get you there.
Yep, thats the rules as the goverment is looking to the housebuilding industry to solve global warming.
You are out by a factor of 10 with your impression of window u-values - they are more like 1.6 -1.8W/m2K not 0.18.
I tend to spec 100mm on the walls and depending on rafter size ensuring adequate ventilation, 100mm between and 40+12.5mm insulated plasterboard to underside.
You could look at multifoils such as Triso Super 10 as an alternative but this will still need some Kingspan.
You are out by a factor of 10 with your impression of window u-values - they are more like 1.6 -1.8W/m2K not 0.18.
I tend to spec 100mm on the walls and depending on rafter size ensuring adequate ventilation, 100mm between and 40+12.5mm insulated plasterboard to underside.
You could look at multifoils such as Triso Super 10 as an alternative but this will still need some Kingspan.
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