Basement & Crawl Space Insulation

Is your Basement Properly Insulated and Air Sealed? Many drafts and cold air will enter a home through its basement and drive the warm air in the house out.

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Three Methods for Insulating Basements & Crawl Spaces

Closed Cell Foam

Creates a complete seal.
Highest R-value.
Will not support mold.

Perfect for hard to reach crawl spaces with dirt floors, or where not a lot of insulation can be added.

Thermax Polyisocyanurate

R-7 per inch
Complete air and thermal seal
Looks clean and sturdy when properly installed

Holds up existing insulation and is more durable against storage items bumping against it

Fiberglass

Highly ineffective.
Mice and insects can live in it.
Not recommended.

Fiberglass batts are highly ineffective, and are normally used as the cheapest method to meet code

Is your Basement Properly Insulated and Air Sealed?

Bad Insulation

Basement ceiling insulation is important to keep cold air out and floors warm on first floor.

The insulation above is damaged and will not work properly. The effective R-value has dropped from R19 to about an R5.

Rim Joists are basically an extenstenion of your main house walls into your basement.

Cold air will quickly go through cracks and convect through the thin wood. Rim Joist should be sealed and insulated.

Large penetrations is where the majority of cold air will be sucked up into the home.

After foaming around all penetrations drafts, heat loss will be significantly reduced.

Good Insulation

Insulation is properly held in place and blocks the thermal bridging by bringing the insulation around the ceiling joists. The insulation will still be properly fastened after many years unlike hanging fiberglass that falls due to gravity

The basement rim joist is properly sealed and insulated from outside drafts making your basement more comfortable. The extra heat given off by your heating system, dryer, hot water tank, pipes and hvac ductwork will all rise and warm your floors

You may not realize just how many of your pipes penetrate this area. Properly sealing with appropriate/fire rated materials is necessary to prevent cold outside air from entering your home

Many drafts and cold air will enter a home through its basement and drive the warm air in the house out

Cold air will be driven into the home from the basement from what is known as the Stack Effect. Stack effect occurs because there is a difference in temperature between the inside of your home and the outside. In the Winter when your home is warmer then the outside air, the warm air rises out of the house and draws in new cold air from the basement. Thus its important to seal up and insulate your home to prevent the cold air from being drawn into the home.

Common place for cold air to enter basement: