What is a joist box?

The joist box is the gap between the floor joists, along the outside wall.  Floor joists are the supports that span the length of your home dwelling. The ends of the joists rest on the sill plate, which is the board installed directly onto the top of your concrete foundation.  

Depending on building codes and materials used, the joists are between 10-18 inches apart.  That gap between joists is what forms the joist box.

Closed cell spray foam insulation is the ideal way to insulate your crawl space in your home (new and a remodeling home), as long as it is applied to the right locations in your craw spaces. Fake contractors or DIY kits can install the materials incorrectly. If it’s done poorly, it can be a waste of money -or worse- it could actually cause severe damages. 

At Daddy Spray Foam Insulation a family owned and operated company that specializes in foam insulation installation.  We have helped thousands of customers like you in all Long Island, NY.   If you have fiberglass insulation in your crawl space, we strongly urge you to replace it with closed cell spray foam. Save energy and keep your home cool in the summer and warm in the winter.