I m using 2 foam board 2 foil faced polyiso r value is approximately r14 fastened to the bottom of the 2 6 truss chord which leaves a nice 2 1 2 air space.
Foam board ceiling insulation.
Seal the insulation or the ceiling surface below against air leakage.
You don t want moist air leaking into the roof cavity.
Foam board the last option that i considered and the one i m using is foil faced polyiso insulation board.
Do no use a vapor barrier under the insulation.
Ceiling foam board insulation.
Use closed cell spray foam closed cell foam board extruded polystyrene such as dow styrofoam or foil faced iso board.
For pricing and availability.
Foam board insulation is easy to use and is a great diy way to add some insulation.
Some types of thicker foam board insulation are available but they may need to be special ordered.
It comes in standard size 4 8 sheets and smaller sizes in many different thicknesses from 1 4 inch to 2 inches.
5 panels with 97 reviews.
The air space will be continuous down to the soffit vents and.
Rigid boards are manufactured from either.
Regular ceilings are likely to be under attics with either batt insulation between the joist bays or in some cases rigid insulation between the rafters.
2 in x 4 ft x 8 ft 1 faced polystyrene garage door foam board insulation.
2 in x 4 ft x 8 ft.