Rim Joist Spray Foam Insulation In Cambridge, Ontario

Why The Rim Joist Leaks

The rim joist sits at outside grade, with cracks between the lumber, the sill plate and the concrete or stone. Winter air pours through them. Fibreglass stuffed into the pockets does not stop air, and the wood behind it can turn damp and mouldy.

Closed Cell Foam Seals And Protects The Wood

Every pocket gets filled with closed cell foam. That seals the cracks, insulates the lumber and stops moisture forming on it. The basement feels less drafty right away, and floors upstairs warm up.

Older Homes Have Uneven Sill Plates

Older Galt and Preston houses often have sill plates sitting crooked on stone. Spray foam follows every bump and seals the seam between wood and stone, something rigid board cannot do.

Pair It With Basement Walls

If you plan to finish the basement, the rim joist and the walls can be done in one trip. The basement spray foam page covers the wall work.

Rim Joist Spray Foam Insulation And Pests

Gaps around the rim joist are a favourite way in for mice, ants and cold air alike. Sealing them with foam takes away the open gaps and the soft nesting material that batts provide. Foam is not a pest treatment, but it does close the easy routes.

How Long The Job Takes

Most rim joist jobs take a few hours. We need a clear path along the basement walls, so boxes and shelving near the top of the foundation should be moved back a couple of feet. Ductwork and wires that cross the rim are worked around, not removed.

A Small Job With A Big Difference

The rim joist is a small area, often well under 200 square feet in a typical house, but it leaks a large share of basement air. That is why rim joist spray foam is one of the best value jobs we do. Pricing is usually by the running foot of perimeter, and the estimate shows the total length and the foam depth.

If you have a cold room under a front porch or a garage beside the basement, mention it. The rim joist around those spaces often needs extra attention.