Hi All,
We've got an extension that I'm doing with my brother & some other assistance.
Our walls are 100mm cavity, with a brick outer, 100mm rockwool full fill cavity and 100mm Thermalite Hi-Strength 7 blocks for the inner skin. We were planning on doing dot & dab, however, we've currently got a out of work experienced foreman helping out, who's suggested we just skim the Thermalites rather than doing dot and dab and then skimming that. With one less layer we get less insulation, but it'll save time and money.
How much of an effect would this have on U-Values? Would we need to dot & dab to meet building regs? It's about 21m2 of external wall (3mx3m room), and I'm trying to decide if money and time savings are worth the insulation tradeoff an the slight loss of room size.
We've got an extension that I'm doing with my brother & some other assistance.
Our walls are 100mm cavity, with a brick outer, 100mm rockwool full fill cavity and 100mm Thermalite Hi-Strength 7 blocks for the inner skin. We were planning on doing dot & dab, however, we've currently got a out of work experienced foreman helping out, who's suggested we just skim the Thermalites rather than doing dot and dab and then skimming that. With one less layer we get less insulation, but it'll save time and money.
How much of an effect would this have on U-Values? Would we need to dot & dab to meet building regs? It's about 21m2 of external wall (3mx3m room), and I'm trying to decide if money and time savings are worth the insulation tradeoff an the slight loss of room size.