Has the steel been designed to allow for the door to be hung off it, how much will it deflect once the door is hanging off it?
Gap between bifolds and RSJ
- Thread starter Owdotz
- Start date
Sorry I didn't realise you had 30cm to build up You will still need something like 6x2 under your lintel to catch the insulation and plasterboard so I would box it out in that timber and either osb or ply on the inside and as cdbe says pvc or cement board on the outside.