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3 Methods of Insulating Basements/Crawlspaces

fiberglass basement insulation


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


Basement insulation bad



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?


basement 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 joist insulation


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.

spray basement foam

rim joist good insulation


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

Common place for cold air to enter basement:
  • Band Joist
  • Windows
  • Plumbing and Electrical penetrations
  • Bulkheads and doors

*If drafts aren't obvious, a blower door can be used to depressurize your home and make drafts sources much easier to locate.




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.

attic insulation

Attic Insulation

Your attic should have 13"-14" of insulation.

i1035 FW1.1

Wall Insulation

Walls cavities should be completely filled.


Basement /Crawl Space Insulation

A tight safe crawl space is most effective.