Rim Joist Spray Foam Insulation In Kitchener, Ontario

Cold Air Slips In Over The Foundation

The sill sits on top of the concrete, and in older homes the joint between them is rarely sealed. Wind pushes cold air through that joint and into the joist bays. On a cold day you can feel it with the back of your hand.

Once sprayed, rim joist spray foam insulation fills that joint completely. Batts cut to fit each bay block a little of the cold, but air flows right around them.

Rim Joist Spray Foam Insulation Prevents Mould Behind Batts

Damp basement air reaches the cold band behind a batt and turns into frost or water. Over a few winters, that moisture stains the wood and can grow mould. Pulling the batts often shows dark wood and dead bugs behind them.

Closed cell foam keeps room air off the cold wood, so condensation has nowhere to form.

Rim Joists Make A Smart First Job

Rim joist spray foam insulation is one of the best values in a house. Most homes take less than a day, and it can be done from the floor in an open basement or through a ceiling opening in a finished one.

We often pair it with basement spray foam insulation on the walls, since the rig is already running.

Rim Joist Spray Foam Insulation Pricing

Rim joists are priced with basement work, at about $3 to $5.50 per foot. Because the area is small, many rim-only jobs land near our $1,500 minimum.