- Joined
- 15 Jul 2018
- Messages
- 200
- Reaction score
- 8
- Country
I have replaced all ground floor joists due to damage and the next stage is to insulate them now. The building control officer came round to inspect mid job and advised to install 80mm celotex between our 95mm joists and leave the extra 15mm gap at the top of the insation. (Detached Victorian (1890) with no wall insulation or cavity)
He didn’t mention anything about vapour barriers or taping between where the joists and insulation meet to keep it sealed. He even advised to not fill the gaps between the wall and outer joists. I’ve seen many comments about filling this gap with insulation or sand/cement to prevent drafts.
Is his advice good or should I be taping the gaps?
EDIT: the subfloor is very well vented around the whole house with an original DPC and no signs of rising damp. Some corners of the subfloor are wet after heavy rain fall but remedy work outside with drainage should help this.
He didn’t mention anything about vapour barriers or taping between where the joists and insulation meet to keep it sealed. He even advised to not fill the gaps between the wall and outer joists. I’ve seen many comments about filling this gap with insulation or sand/cement to prevent drafts.
Is his advice good or should I be taping the gaps?
EDIT: the subfloor is very well vented around the whole house with an original DPC and no signs of rising damp. Some corners of the subfloor are wet after heavy rain fall but remedy work outside with drainage should help this.