How To Insulate On Roof 2x6 Frames
Screw it down and glue down a 45 mil epdm membrane.
How to insulate on roof 2x6 frames. The limiting u value the maximise u value which cannot be exceeded required under current building regulations for the roof is 0 20w m. Corrugated metal panels are screwed directly to the purlins with no sheathing. If you choose to use the 2x6 roof joists you ll only be able to fill the joist space up about 4 5. Then a vapor barrier over all that.
The building is unheated now and the condensation is not too bad. Tongue and groove pine over that then. Heat rises and therefore the building regulations requirements for heat loss through roofs are more stringent than those for walls. Cut and insert 1 or thicker high r foam insulation sheets r 8 per inch against the furring giving a 1 or greater air path between the insulation and the roof deck under the cathedral ceiling.
Soooo then install the same perimeter wood blocking right over the roll roofing to match insulation thickness 5 or so of polyiso. If you choose sistering 2x10 s then they have a net depth of 9 1 4. Probably 1000 all put together for an r 49 roof in a 2x6 frame roof. So your choices are 3 1 2 thick batt insulation for an r value of about r 11 9 or rigid insulation board for a r 20 to r 30 depending on the type of board.
I have a 14x26 cabin the roof is 2x6 10 pitch rafters with horizontal 2x4 purlins. How to insulate a roof. Building regulations for insulating a roof. The insulation would be flush with the roof wall 2 6 s.
I m wondering what the best way to insulate this roof would be.