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Thank you Ian & Motorbiking for taking time to reply, much appreciated. I’ll switch to 6 x 2 rafters thank you that’s saved a bit, looking at span tables for c24, I cant go any thinner + it allows for 100mm insulation + 50mm air gap as doing a “cold roof”.. everydays a school day I’ve found...

Hi All, once again turning to you for some advice. I am building a 3 x 3 m corner summer house, which has a diagonal of about 4m I need to stay below 2.5m to avoid planning restrictions and struggling The option I'm looking at at the moment is.... Base - 3" (3 x 2 on concrete with a membrane)...

SOLUTION (BE WARNED STILL TO BE TESTED ) After much googling, I found another article that hinted on close cells membranes. From that article I found out that in the US they put FoamsealR between concrete and timber to act as a weather / water / airtight barrier. it’s a barrier strip of...

Thx SxTurbo, appreciate quick reply. 2a -DPC wrapped joists no need for air gap above/below the PIR and floor. more straightforward than I’d hoped for

Hi all, having searched and searched for a clear answer I’m hoping some one can help. I’m going to try and build a 3m x 3m garden room over lockdown. There is already a concrete base down which I am going to put it on which was laid in 1950s I think, very flat and level. I planning 2” x 3”...