Use closed cell spray foam closed cell foam board extruded polystyrene such as dow styrofoam or foil faced iso board.
Foam board ceiling insulation.
For pricing and availability.
You don t want moist air leaking into the roof cavity.
Seal the insulation or the ceiling surface below against air leakage.
Some types of thicker foam board insulation are available but they may need to be special ordered.
Foam board the last option that i considered and the one i m using is foil faced polyiso insulation board.
2 in x 4 ft x 8 ft.
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.
It comes in standard size 4 8 sheets and smaller sizes in many different thicknesses from 1 4 inch to 2 inches.
2 in x 4 ft x 8 ft 1 faced polystyrene garage door foam board insulation.
Ceiling foam board insulation.
Rigid boards are manufactured from either.
Some of the most reviewed foam board insulation are the silverboard 24 in.
Foam board insulation is easy to use and is a great diy way to add some insulation.
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.
5 panels with 97 reviews.
Do no use a vapor barrier under the insulation.