iNf
Member
- Messages
- 566
- Location
- Hereford, England
I'm in the process of turning the SIL's summer house into a home office. The roof joists are 5" deep, the original plan was for 50mm insulation but we have enough left over for double depth. Will a 25mm air gap be enough? Width between joists approx 500mm, length 2.6m with vent holes each end. Any advice welcome.