How To Insulate On Roof 2x6 Frames

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.

How to insulate on roof 2x6 frames.

Probably 1000 all put together for an r 49 roof in a 2x6 frame roof. However i want to add a wood stove for next winter. Also adding 2 vents between each bay of rafters which are 2 oc that vent out my soffits. Soooo then install the same perimeter wood blocking right over the roll roofing to match insulation thickness 5 or so of polyiso.

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. I m wondering what the best way to insulate this roof would be. The insulation would be flush with the roof wall 2 6 s. I have a 14x26 cabin the roof is 2x6 10 pitch rafters with horizontal 2x4 purlins.

Then a vapor barrier over all that. Nail 1 furring along every rafter side against the roof deck. Screw it down and glue down a 45 mil epdm membrane. The limiting u value the maximise u value which cannot be exceeded required under current building regulations for the roof is 0 20w m.

Heat rises and therefore the building regulations requirements for heat loss through roofs are more stringent than those for walls. Corrugated metal panels are screwed directly to the purlins with no sheathing. If you choose sistering 2x10 s then they have a net depth of 9 1 4. The building is unheated now and the condensation is not too bad.

Building regulations for insulating a roof.