I need to remove the plasterwork beneath a bedroom bay window in order to insulate behind it. It is a timber frame and weatherboard construction and freezing cold in the winter. The inside is lath and plaster and very crumbly,the outside looks quite new and undamaged so removing the inside seems the better option.
Once I remove the lath and plaster I plan to unsulate with kingspan as thick as possible and a vapour barrier.
Do I just screw plasterboards to the timber frame/batons on the inside and re-skim. What exactly is the structure of these wooden frames? I wont really know what I'm up against until I remove the plaster on the inside.
Any information on the construction of the bay window frame and how to replaster would be appreciated.