These pictures show the complete process of injecting Airkrete foam insulation into existing walls. This home had insulation in only one of the exterior walls. The exterior finish was stucco with texture.
Step 1: Cutting the Holes
Each wall cavity must be drilled in order to fill it with foam insulation. In older construction there will often be a fire block in each stud cavity. This means a hole must be created above and below the fire block. We use a combination of round holes cut with a stucco bit, a grinder with stucco blade, or a 3/4 inch masonry drill bit. Small cavities are drilled with the masonry bit.
Holes are cut into stucco to fill with foam insulation. We use a grinder or stucco hole saw.>
Step 3: Injecting Airkrete Wall Foam
Each cavity is filled with foam insulation. We insert a fill tube all the way to the end of the cavity to ensure a complete fill. The tube is removed as the foam is injected into the wall. Wall cavities are filled from the bottom up and from the top down. The foam material "sets" within a few seconds of coming out the nozzle and does not flow out of the wall.
Foam insulation is injected into a wall cavity
The fill hose is inserted all the way to the end of the cavity ensuring a complete fill with wall insulati
Step 4: Finished Product
Can you see where the walls were drilled, filled and patched? This project was more than 260 holes cut into the exterior wall.
This wall has more than 40 holes cut and filled with foam. The patch job came out perfect.
There are two patched holes in this closeup photo. Can you see them?