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LeafGuard Iowa

Rim Joist: Solved

18 January 2018

The best material for insulating the rim joist is spray foam.

The rim joist is the edge of the wood floor framing system. It sits on top of your home’s foundation walls and is attached to the sill plate.

insulation iowa for energy efficiency
The rim joist is a large source of energy loss. The rim joist is the edge of the wood floor framing system that sits on top of the homes foundation walls.

In a typical Iowa home, the rim joist area is a large source of energy loss. Quite often it lacks the appropriate air sealing. This allows the winter air from outside the home to constantly leak in through the wood joints, gaps, and openings for duct, plumbing, and electric wires.

fiberglass batt insulation

Typically the rim joist is left vacant or stuffed with some basic fiberglass batt insulation. Since fiberglass doesn’t stop airflow, the cold air will leak in. Another factor with fiberglass insulation, it loses R-value when it is damp. Midwest basements tend to be naturally damp and have condensation issues. The results of poor rim joist air sealing and insulation can be felt throughout the house in the form of drafty rooms and cold floors.

Spray foam is the best material for insulating the rim joist

The best material for insulating the rim joist is spray foam. Spray foam is resistant to water, offers superior R-value and seals the air leaks – all in one application. Home Solutions of Iowa’s two-part polyurethane spray foam not only provides an exceptional R-value (R-7 per inch) but also expands to fill the holes and gaps, stopping air leakages in one simple step.

Simply put the best solution to air sealing and insulation in Des Moines. Contact us for your free estimate today!

 

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