4d extend insulation into joist space to reduce air flows.
Foam board insulation between floor joists.
If it you need to spread it use a brush to help cover and smooth out the glue.
Place back between the joist and hold it in place for five seconds or for how long the instructions on the glue says.
We chose 2 in thick r 10 extruded polystyrene don t use expanded polystyrene which is a less effective air and moisture barrier.
Once the glue is dry and all the foam board insulation is installed you can seal around the foam boards with caulk.
You can insulate second floor rim joists following the same steps shown here if you happen to tear out a ceiling during remodeling.
The best insulation material for crawl spaces is rigid foam insulation board.
Instead of installing the foam insulation between floor joists in the crawl space the foam board is installed against the crawl space foundation walls.
Step 5 seal.
You want it snug but not to.
4b slab floors built directly on the ground.
When the basement or crawl space has vents installed insulating joist bays.
Rigid foam is the best insulation for rim joists.
4c as an alternative to floor insulation foundation walls of unvented crawl spaces.