Attic Top-Plate Air Sealing
Sealing the seams where drywall meets the wall top plates — and the wiring holes through them — while the attic insulation is out.
Taper a Length of PEX Onto Your Foam Gun to Reach the Deep Gaps
A short piece of underfloor-heating pipe pushed onto the foam gun's nozzle turns it into a four-foot-reach applicator — foam lands in the back of the cavity instead of curtaining over the opening, and the mess stays down.
spray foam hard to reach areas, foam gun nozzle attachment, diy foam gun extender
The Problem
A foam gun's rigid barrel reaches maybe a forearm into a cavity. The gaps that actually need foam — behind frames, down inside stud bays, at the back of a void — sit past that, so the foam gets sprayed at the opening instead of into the gap, curtains over the front, and reads as filled when the back is empty.
The Technique
- Cut a short-to-long length of PEX — underfloor heating pipe, any offcut — to suit the reach you need.
- Push it onto the gun's nozzle tip so it seats with a friction taper.
- Feed the tube into the gap and foam from the far end back toward yourself.
The tube gives you effectively a four-foot foam gun: the bead starts where the cavity actually ends, fills forward, and the overspray mess around the opening mostly disappears.
Pro tip: Keep the used tube — cured foam inside a dedicated extension tube doesn't matter the way it would in the gun itself, and the same piece lives on the foam kit for the next deep gap. The gun's own barrel still gets its normal cleaner-flush routine.
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