I'm in the process of building a lean to porch and up to wall plate level. The side infield are going to be timber framed then cladded. 1 side is actually being built ontop of a flat roof so I think that is sorted and will be as follows.
Plasterboard, VCL, 25mm celotex, 100mm studs full filled with celotex, osb, breathable membrane, batten, then cladded with an air gap top and bottom.
The other side which is built ontop of the cavity wall I am unsure of. At a guess how does the following sound?
Inside out.
Plasterboard, vcl, 25mm celotex, 100mm studs full filled with Celotex, breathable membrane. Then the gap for the cavity.
Then built on the outside course. 100mm stud laid on a dpc, breathable membrane, batten, then cladding with air gap top and bottom.
Is there a need to install osb or ply on this side?
Plasterboard, VCL, 25mm celotex, 100mm studs full filled with celotex, osb, breathable membrane, batten, then cladded with an air gap top and bottom.
The other side which is built ontop of the cavity wall I am unsure of. At a guess how does the following sound?
Inside out.
Plasterboard, vcl, 25mm celotex, 100mm studs full filled with Celotex, breathable membrane. Then the gap for the cavity.
Then built on the outside course. 100mm stud laid on a dpc, breathable membrane, batten, then cladding with air gap top and bottom.
Is there a need to install osb or ply on this side?