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Thinking of having a 75mm cavity instead of 100mm for an extension wall; space is tight. Does anyone see any issues in doing this. I guess we would use 50mm kingspan and leave 25mm gap. Any issues with this approach? Cheers

Thanks for all the replies. Does anyone happen to know then what worcester say or Vailant on this particular dimension?

Trying to understand how far a boiler flue needs to be when coming out of a pitched roof vertically where there is a window nearby. So if you had a single storey extension against the house and if there is a window above the pitched roof i.e. first floor. Worcester diagram says 1500. Baxi seems...

Bumping this up. Would plywood be ok and should i take the felt down beforehand - felt was just put up to make it look tidy and hide the kingspan. Obviously the rest of the rafters in the loft are covered in plasterboard. Would just like to hide / seal off the insulation in the eaves, and...

Hi, Our loft has been converted and we have a large eaves cupboard. At the back of the cupboard the rafters have insulation in between and then felt over. Behind those rafters is essentially inside the bay ceiling of the bedroom below. I was thinking of putting up some thin ply on to the...