Insulate Rim Joists With Spray Foam Insulation Updated:7/13/2024 Insulating rim joists with spray foam insulation is a great way to make your home more energy efficient. It can help reduce energy bills and create a comfortable environment in any space you're insulating. This article will provide an overview of the benefits of spray foam insulation for rim joists and how to install it safely and effectively or hire a professional spray foam insulation contractor . Whether you're looking to upgrade existing insulation or are starting from scratch, this guide will be invaluable. What Is A Rim Joist? A rim joist is an important structural element in a building's foundation. It runs around the house's perimeter and is usually made from wood, though masonry can also be used. The rim joist connects the floor joists to the sill plate, which serves as the base for walls or other structures rising from the ground. Rim joists are often found around crawl spaces and basements, mak...