Spray foam is a very expensive option however.
Installing foam board insulation ceiling.
How to install astroboard polystyrene foam board insulation.
Got it at the home depot here s a link rmax thermasheath 3 2 in.
It comes in standard size 4 8 sheets and smaller sizes in many different thicknesses from 1 4 inch to 2 inches.
Some types of thicker foam board insulation are available but they may need to be special ordered.
In most cases however insulation will not help prevent moisture.
Foam board insulation would be a more economical especially if you are supplying the labor see photo.
Foam board the last option that i considered and the one i m using is foil faced polyiso insulation board.
The air space will be continuous down to the soffit vents and.
Foam board insulation is easy to use and is a great diy way to add some insulation.
Hire a pro to install spray foam insulation.
Secondly and this is the best way you can install a drywall to frame the wall before applying foam board 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.
How to install astroboard polystyrene foam board insulation.
A brief snippet of how and why i used rigid foam insulation for some areas of the tiny house.
Press the cut insulation board to fit between the rafters or joists.
R 13 1 polyiso rigid foam insulation board 613010 the home depot after installing and taping the r max board i managed to find blow in insulation the nice white cellulose type for 3 00 55 gallon bag.
Always cover the tops of the ceiling joists to make sure the insulation is deep enough to reach your target r value and to prevent thermal bridging the heat loss that occurs through the wood framing.
Align the front of the board with the face of the rafter or joist.
Firstly you can apply it directly onto the house s concrete walls with the help of a construction adhesive that will hold it in place.
Foam blocks airflow needs no vapor barrier and has a higher r value per inch than loose fill.
Leave an air gap between the roof sheathing and the board.