Again the thickness will vary depending on the material you choose to use.
Vaulted ceiling insulation building regs.
The limiting u value the maximise u value which cannot be exceeded required under current building regulations for the roof is 0 20w m.
Building regulations for insulating a roof heat rises and therefore the building regulations requirements for heat loss through roofs are more stringent than those for walls.
1 foot 304 8 mm.
Celotex xr4000 150mm between rafter insulation with 25mm air gap 12 5mm plasterboard.
Any other materials that i need.
Ie what size straps masonry hangers etc.
If the roof has no ceiling then the insulation can be placed between the rafters and ventilation maintained as described above in which case the ridge should also have vent tiles installed to allow for through.
Ceilings and expo sed floors r value wall r value floor r value base ment wall r value slab perim eter r value and depth 0 39 r 37a r 13 r 19 r 10 10 4 feet for si.
Building regs suggest i need a structural calculation for that do you guys agree.
These are expressed as a u value which needs to be achieved.
Insulation can be placed between the ceiling joists.
If you decide to construct a vaulted ceiling check with your local office regarding building permits and consult with an experienced structural engineer to ensure safety.
And how else would i make the roof supported if im going for a vaulted ceiling without cross joists.