Kingspan thickness Query

[thomo2710]

Insulating a Garden Room.....

Stud is 4x2, wrapped outside edge with breathable membrane then 19mm T&G nailed to studwork.

Kingspan on the inside walls - do i fill the whole void ie 100mm Kingspan - or does there need to be an air gap?

Same again with the roof - its a flat roof done in 4x2 timber, covered with 18mm Ply and EPDM. Fill the whole void or leave an air gap?

Many Thanks

 

[Deluks]

Did you not put the exterior cladding on battens? If not then don't full fill, use 75 or 80mm insulation, flush with the inside (ie: air gap on the cold side)