Hi all,
We are having a sloping pitched roof on our rear extention and the architect has put 100mm insulation between 200mm rafters, then below the rafters a 50mm insulation with vapour control & drywall built in, Kingspan Insulation K17. Then an additional 12.5mm plasterboard on top of this.
I asked the architect if this could be changed to 150mm in the rafters then a vapour control barrier then 12.5mm plasterboard but in his usual 1 line how dare I question him response gave the answer "as per the spec".
So the question is could this be changed as I have suggested or should I go with what the architect recommends? Also is there really any need to add 12.5mm plasterboard on top of Kingspan K17?
Thanks in advance
Paul
We are having a sloping pitched roof on our rear extention and the architect has put 100mm insulation between 200mm rafters, then below the rafters a 50mm insulation with vapour control & drywall built in, Kingspan Insulation K17. Then an additional 12.5mm plasterboard on top of this.
I asked the architect if this could be changed to 150mm in the rafters then a vapour control barrier then 12.5mm plasterboard but in his usual 1 line how dare I question him response gave the answer "as per the spec".
So the question is could this be changed as I have suggested or should I go with what the architect recommends? Also is there really any need to add 12.5mm plasterboard on top of Kingspan K17?
Thanks in advance
Paul