How to Install R-Tech Rigid Insulation on a Cinder Block


R-Tech rigid foam insulation may help reduce heat transfer through walls, which can reduce heating and cooling costs. It can be installed in cinder block walls, which are commonly used in basement, garage and storage building construction. Insulation installed on concrete block walls may provide more efficient resistance to heat transfer than insulation poured or filled into block cavities, according to the U.S. Department of Energy. Installing R-Tech rigid foam insulation is a straightforward process because it comes in sheets that you can cut to size to cover your cinder block walls.

  • Coat the cinder block walls with concrete sealant using a paintbrush or roller. Allow the sealant to dry for at least 30 minutes, and then apply a second coat of sealant.

  • Coat one side of a sheet of R-Tech rigid foam insulation with construction adhesive using a paintbrush. Place the insulation sheet on one wall so that one side meets the corner of the wall. Press the board against the wall, and hold it in place for two to three minutes to allow the adhesive to bond the sheet to the wall.

  • Continue coating the R-Tech rigid foam insulation sheets with construction adhesive. Press the sheets against your cinder block walls, fitting the edges of each sheet tightly together to prevent insulation gaps. Cut the sheets with a utility knife as necessary to obtain the proper sizes and accommodate ductwork, electrical outlets and other obstacles.

Tips & Warnings

  • Coat the foam side of your R-Tech rigid foam installation sheets with construction adhesive if you are using foil-backed sheets. The foil backing should face the interior of the room.
  • Wear a respirator mask when applying construction adhesive to insulation sheets to avoid inhaling fumes. Also, open windows if possible to avoid the buildup of fumes in your workspace.

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