Hi, my builder is currently building a flat roof dormer for me and has used 11mm OSB plywood instead of 19mm wbp plywood.
The spec from the architect is below which details k-render but I have discussed with the builder and agreed tiles would be better (not sure if that is relevant information).
"k-render fixed to expermet mesh to give key, fixed to 19mm wbp plywood sheathing fixed to 100x50mm timber studs (100x100mm corner posts). Include for 100mm thk Kingspan / Celotex insulation slabs fixed between studs with 500g Visqueen vapour barrier over studs & insulation."
The builder tells me what he is using is better but I'm concerned. Should I be?
Thanks for replies to all
The spec from the architect is below which details k-render but I have discussed with the builder and agreed tiles would be better (not sure if that is relevant information).
"k-render fixed to expermet mesh to give key, fixed to 19mm wbp plywood sheathing fixed to 100x50mm timber studs (100x100mm corner posts). Include for 100mm thk Kingspan / Celotex insulation slabs fixed between studs with 500g Visqueen vapour barrier over studs & insulation."
The builder tells me what he is using is better but I'm concerned. Should I be?
Thanks for replies to all