Hi All,
I've got a 1960's bungalow which I'm planning to build a first-floor extension of timber frame construction in a couple of years' time. So, I've started doing some preliminary drawings and research before I involve a timber frame designer...
I'm wondering if anyone here can answer a question on the build-up of a timber frame. Most of the kits which I've seen are (out to in)
Cladding > 45mm Batten > Breather Membrane > 9mm OSB > 140mm stud with 120mm PIR between studs > VCL > 45mm battens to form service void > Plasterboard and skim
I want to know why nobody seems to build-up frames as (again out to in)
Cladding > 45mm Batten > Breather Membrane > 160mm stud with 120mm PIR between studs > 9mm OSB > VCL > Plasterboard and skim
This would give you a service void in the insulated cavity, whilst also providing a patress to all walls internally via the 9mm OSB (which is there to prevent racking). Only thing I can think is that the VCL would have to be penetrated to get services through - I don't know if this could go on before the OSB in order to avoid this.
Ultimately, I'd like all stud walls lined with OSB directly behind the plasterboard to form a patress - so I'm trying to avoid a second layer of OSB. The frame would be first fixed with electrics and plumbing on-site, so it wouldn't be an inconvenience to fit the OSB and VCL on site.
I've got a 1960's bungalow which I'm planning to build a first-floor extension of timber frame construction in a couple of years' time. So, I've started doing some preliminary drawings and research before I involve a timber frame designer...
I'm wondering if anyone here can answer a question on the build-up of a timber frame. Most of the kits which I've seen are (out to in)
Cladding > 45mm Batten > Breather Membrane > 9mm OSB > 140mm stud with 120mm PIR between studs > VCL > 45mm battens to form service void > Plasterboard and skim
I want to know why nobody seems to build-up frames as (again out to in)
Cladding > 45mm Batten > Breather Membrane > 160mm stud with 120mm PIR between studs > 9mm OSB > VCL > Plasterboard and skim
This would give you a service void in the insulated cavity, whilst also providing a patress to all walls internally via the 9mm OSB (which is there to prevent racking). Only thing I can think is that the VCL would have to be penetrated to get services through - I don't know if this could go on before the OSB in order to avoid this.
Ultimately, I'd like all stud walls lined with OSB directly behind the plasterboard to form a patress - so I'm trying to avoid a second layer of OSB. The frame would be first fixed with electrics and plumbing on-site, so it wouldn't be an inconvenience to fit the OSB and VCL on site.