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Thermal Insulation: Styrofoam™

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Dow styrofoam™ smtg™ wall applications

Dow Styrofoam™ Tongue and Groove extruded polystyrene insulation is a foam insulation board with tongue and grooves along the long edge of the board.

Dow Styrofoam™ SMTG™ has the competitive edge over cavity insulation and non-insulating sheathing. Like all Dow Styrofoam™ extruded polystyrene insulation, SMTG™ offers a high R-Value combined with an exceptional resistance to moisture and warping. Its proprietary closed cell structure enables it to defend against all forms of water and water vapour, so it maintains a stable R-Value over time.

The tongue-and-groove edge treatment makes Dow Styrofoam™ SMTG™ especially effective against air infiltration, one of the leading causes of energy loss in a home. And with boards that fit snugly against one another, you will have a smooth, even surface for the exterior siding.

Dow Styrofoam™ SMTG™ is lightweight, easy to install and with a high compressive strength, it’s the right fit for ceiling and foundation applications, as well as walls.

  • exterior walls over studs or non-insulating sheathing like OSB or plywood interior walls—concrete block
  • ceilings—cathedral, vaulted or flat ceilings, finished attic
  • exterior foundation walls
  • interior foundation walls
  • crawl space

Dow Styrofoam™ SMTG™ is available in a variety of thicknesses and R-values and it meets residential building codes.

Compressive Strength: 200 kPa
Density: 30 kg/m³
Thickness: 25, 30, 40, 50, 75, 100 mm
Width: 600 mm
Length: 2500 mm
Water Absorption: 0.3 %
Thermal K Value: 0.028 W/mK
Fire Rating: AS1530
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