Internal Wall Insulation (IWI) is applied to the internal walls of a building. It typically consists of dry lining in the form of pre-insulated plasterboard or built-up systems using fibrous insulation such as mineral wool held in place using a studwork frame.
Key Points – Internal Wall Insulation:
- is generally cheaper to install than external wall insulation
- will slightly reduce the floor area of any rooms in which it is applied (the thickness of the insulation is around 100mm)
- can be disruptive but can be done on a room by room basis
- requires skirting boards, door frames and external fittings to be removed and reattached
- can make it hard to fix heavy items to inside walls – although special fixings are available
- needs any problems with penetrating or rising damp to be fixed first