Re: Optimum insulation for horizontal section of attic trusses (i.e. between truss ty
its a better construction to carry your insulation from the eaves, up the slope, over the flat roof, and back down. if you do th sthen you can use the area behind the dwarf stud walls for storage etc without compromising the insulation envelope.
I would do this as follows:
1. quilted insulation at the eaves to ensure the cavity closer block is covered, always maintain 50mm air vent if its a 'cold' constructed roof.
2. At the moment, 130mm rigid PU insulation is needed to achieve this, so, depending on your truss size, put 100mm between truss and 'slab out' with 42.5 composite plasterboard.
3. Then i would incoroprate 100mm rigid between ceiling joists, slab out with 42.5 as ceiling AND incorporate 100mm quilted insulation over an ensure all gaps are filled.