Drill & Fill, Toronto

The method, step by step

Drill and fill is how a closed cavity gets insulated without demolition. It is a precise job rather than a brute one: the density of the fill, the spacing of the holes and the handling of blocking are what separate a wall that performs from one that has voids in it.

• Studs and fire blocking located, so every closed compartment gets its own hole.
• Holes drilled from outside through siding or brick where possible.
• Foam injected wet, expanding around wiring and pipes.
• Holes plugged, siding replaced or brick plugs mortar-matched.

When this is the wrong answer

A cavity that already contains batts cannot be injected — the foam will not displace them. Balloon framing without blocking cannot be controlled. And a wall with water getting into it needs that solved first.

Common questions