Technical Papers

Crawl Space Repair - Tip of the week: Considering Rim Joist Insulation

Tuesday, September 13th, 2016 by Rosie Graves

rim joist


A rim joist is the board just above the foundation at the perimeter of your home’s floor system. It leaks unconditioned air from outside and is not insulated properly, contributing to cold basements in winter and condensation/humidity in summer. RimTight insulation seals and insulates your rim joist. Rim joists are sealed and insulated with one of two methods, and the installer would choose which option is the best for each property.


rim joist insulation

Both methods provide the same benefits.

Insulating the rim joists does a number of things:

- Saves energy

- Lowers heating costs

- it pays for itself

- Creates a warmer, more comfortable basement

- Reduces warm humid air entering in summer

- less condensation, dehumidifier runs less


For a full energy efficient, warm basement, we recommend RimTight with Foamax wall insulation, EverLast Basement Windows and, when installing a finished floor, ThermalDry Insulated Floor Decking.

These products are exclusively offered by Basement Systems dealers. 

About the author
Rosie Graves joined the Redeemers Group, Inc. team in February 2012 in a marketing capacity. Since that time she has served in several different capacities of the business, and was named Chief Operating Officer in April 2019. As COO, she oversees all business operations working alongside the executive leadership team.

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