Rim Joist Spray Foam Insulation In New Hamburg, Ontario

Why The Rim Joist Leaks So Much

The rim joist sits right where the wooden house meets the masonry below. There are cracks between sill plate and wall, between each joist and the rim, and around every pipe and cable punched through it.

Most houses have a scrap of batt jammed into each bay, or nothing at all. On windy days cold air pours in, and you can often spot cobwebs swaying or a sliver of daylight.

Batts In The Rim Joist Can Cause Mould

Through the winter, humid basement air drifts behind those batts and meets the cold rim. Water beads on the wood and soaks in. Over a few seasons that can mean mould or rot.

Closed cell rim joist spray foam insulation bonds directly to the wood and the top of the foundation. No air pocket is left for moisture to gather in, so the lumber stays dry.

A Small Job That Makes A Big Difference

A typical house has 100 to 200 feet of rim joist. Spraying it takes a few hours, and most owners feel a warmer, calmer basement on the very next cold night.

Rim work often rides along with a basement spray foam insulation job, since the rig is already hooked up.

Older Homes Have Uneven Rims

Older brick houses near the river in New Hamburg often have wavy sills and odd framing. Foam fills each gap whatever its shape, which board and batts simply cannot match.

Pests Use The Rim Joist As A Doorway

Mice and insects find their way inside through the gaps along the sill plate. Batts stuffed into the rim give them a warm place to settle once they are in.

Rim joist spray foam insulation fills those gaps with a firm layer that leaves nothing soft to nest in. It is not a rodent barrier, but it removes the easy entry points and the bedding at the same time.

What Rim Joist Spray Foam Insulation Costs

Rim work is priced by the running foot or folded into a larger job. A rim joist alone may land near our $1,500 minimum, so many people pair it with a second area. The visit costs nothing and gives you the exact number.