How to Seal Masonry Ties Through Foam Board

Foam board is a type of rigid insulation that you can install in a basement or interior wall of your home to increase energy efficiency. If you are installing foam board over masonry ties there will be a void or cavity behind the foam board. Sealing all of the gaps between the masonry ties requires the use of a type of blown insulation that is composed of cellulose.

Tape measure
Construction adhesive
Caulk gun
Caulk
Power drill
Hole saw
Cellulose insulation
Blower
Spray foam
Putty knife

Instructions

- 1
  Measure the width of the wall where you need to install the foam board with the tape measure and make a note of the measurement. Measure the width of the foam board and make a note of the measurement.
- 2
  Divide the width of the wall by the width of the foam board. This gives you the number of foam board pieces needed to cover the wall and masonry ties.
- 3
  Apply construction adhesive to the surface of the foam board with the caulk gun.
- 4
  Position a sheet of the foam board insulation over a masonry tie. Press on the foam board to adhere the construction adhesive. Repeat this step to cover all of the masonry ties with the foam board.
- 5
  Apply a bead of caulk along the seams where two pieces of the foam board meet to create a seal. Allow the construction adhesive to dry for 24 hours.
- 6
  Drill a hole at the top of the wall between the masonry ties using the power drill with an attachment for a hole saw.
- 7
  Place the nozzle of the blower hose over the hole you drilled in the wall. Turn on the blower and begin filling the cavity between the masonry ties with insulation.
- 8
  Remove the nozzle from the wall when the cavity is full. Fill the hole with spray foam and then scrape away the excess with a putty knife.

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