Whenever I have to spray canned-foam insulation in hard-to-reach cavities, I grab my roll of 3⁄16-in. tubing. It’s sold at my local hardware store and fits over the foam’s standard plastic spray tip. I thread the tubing through a 3⁄8-in. pipe about 12 in. long, then fasten the pipe to the tubing with some electrical tape. That’s it.
This solution works great when I have a narrow, deep crack that I need to fill and the can’s straw just won’t reach it. It is also helpful when I need to spray in a space—such as a joist cavity—where it is next to impossible to hold the can in an inverted position. Only the nozzle, not the can, needs to fit into the space.
Bruce Harding, Rennie, None