The simplest and most affordable method of insulating the interior of a block wall is to install rigid foam board insulation.
Spray foam insulation cinder block walls.
Spray foam kits are sold by the board foot 12 inch by 12 inch by 1 inch thick.
Another option would be to fur out an interior wall with wood or steel studs and spray the foam directly into place over the face of the block wall and in between the studs.
Core fill 500 masonry foam insulation core fill 500 is america s leading foam insulation for concrete block precast concrete and hollow cavity brick walls.
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Depending on the density of the blocks an 8 inch thick block wall without any other type of insulation has a thermal resistance value between r 1 9 and r 2 5.
The option for insulating concrete block walls includes spray foam insulation injection foam insulation polystyrene beads foam boards and loose fill masonry insulation.
Spray foam kits are quicker and easier to use plus you get a seamless air barrier and high r value in just 1 inch.
Remove all the trim from the exterior walls window and door casings baseboards crown molding you name it and rip the drywall and studs off the block walls.
Available in large three by five or four by eight sizes the panels.
Then to account for the foam s additional thickness add jamb extensions to the windows and doors and fur out around their openings.
Core fill 500 is a non expanding aminoplast foam that looks like white shaving cream.
Count the number of blocks to be filled and multiply by the corresponding number to figure out what size spray foam kit is required.
While these are the options again the material available to use depends on whether the walls will be covered or the open top is exposed like in a remodel or new build.
Each 6 inch block requires 2 5 board feet and each 8 inch block requires 3 board feet to fill.