3 Methods of Insulating Basements/Crawlspaces
Closed Cell Foam
Creates a complete seal.
Will not support mold.
Perfect for hard to reach crawl spaces with dirt floors, or where not a lot of insulation can be added.
Is your Basement Properly Insulated and Air Sealed?
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.
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
- 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.