How to Install Sill Plate Foam

A sill plate runs over the foundation of the house and if it is not sealed properly, then a lot of cold air can enter the house unnecessarily. It must be sealed properly and made air tight. You can install foam and thus fix the drafty sill plate.

Step 1: Locate the Sill Plate

The sill plate can be set in the basement of the house. It is placed over the foundation of the house and sometimes it is covered with plastic. Locate the sill plate and check if any cold air is coming in.

Step 2: Using the Foam

Push small pieces of foam cut in square blocks between the sill plate and the foundation. It is easier to install the foam where the joints are perpendicular to the sill plate. In places where the joints are parallel push the foam harder.

Step 3: Caulking the Joint

Once the foam is in place, use caulk to secure the gap between the concrete foundation and the sill plate. In case the gap is large use foam rod and then use caulk on the top and bottom of the foam rod.