hello
there is a new room over the garage in the extension.
plans show this as having 100mm kingspan in the ceiling/floor.
this is a room over a cold space below.
its got 225mm floor joists and one inspector said i could put 200mm insulation quilt / rockwool style insulation in instead of the kingspan. is this correct?
i know a floor on an extension slab has to meet 0.22 W/m2 /, but im not sure on the value of a room over a garage? is this the same being a room over cold space?
joist spacing is 400, chipboard 18mm floor, 225x50 joists, galv netting underneath, 12.5mm fireline plasterboards.
also, it it worth putting a vapour barrier under the chipboard floor over the top of the joists? its not on the spec, but would help seal the room.
there is a new room over the garage in the extension.
plans show this as having 100mm kingspan in the ceiling/floor.
this is a room over a cold space below.
its got 225mm floor joists and one inspector said i could put 200mm insulation quilt / rockwool style insulation in instead of the kingspan. is this correct?
i know a floor on an extension slab has to meet 0.22 W/m2 /, but im not sure on the value of a room over a garage? is this the same being a room over cold space?
joist spacing is 400, chipboard 18mm floor, 225x50 joists, galv netting underneath, 12.5mm fireline plasterboards.
also, it it worth putting a vapour barrier under the chipboard floor over the top of the joists? its not on the spec, but would help seal the room.