Vaulted Ceiling Insulation Building Regs

Building regs suggest i need a structural calculation for that do you guys agree.

Vaulted ceiling insulation building regs.

R 30 ceiling insulation may be used in place of r 37 if the insulation achieves the full r value over the entire ceiling area i e not compressed over exterior. Again the thickness will vary depending on the material you choose to use. 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. Insulation can be placed between the ceiling joists.

1 foot 304 8 mm. Finally traditional fiberglass insulation works well in cathedral ceilings although a 2 inch breathing space between the insulation and the roof sheathing must be included. 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 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.

Celotex xr4000 150mm between rafter insulation with 25mm air gap 12 5mm plasterboard. And how else would i make the roof supported if im going for a vaulted ceiling without cross joists. Any other materials that i need. These are expressed as a u value which needs to be achieved.

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.