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Insulating Exterior Foundations


Residential Solutions - Insulating Exterior Foundations

Energy Tip

Continuous insulation applied to the exterior of foundation walls reduces
expansion and contraction concrete foundation walls would be subject to
due to temperature differences between the interior heated space and the
exterior air/soil.




Follow these simple How-to steps to install your PlastiSpan insulation to have an Insulating Exterior Foundations.

1. Follow the building code. Be sure to follow the building code requirements applicable
in your region.


4. Drainage at Footing.Place drainage tile covered by coarse gravel at the base of the wall, as per local building code.
2. Install Insulation.Ensure that the concrete surface is
dry and free of dirt. Starting from a corner, apply
PlastiSpan HD insulation
boards to the wall from the
top of the footings to the top
of the basement wall. Use an adhesive compatible with expanded polystyrene (EPS) insulation.

5. Protect Exposed Insulation. PlastiSpan HD insulation must be protected from the top of the basement wall to 12" below grade to prevent damage. Stucco parging is one common protective layer that may be applied. Talk to your building supply professional about other options.
3. Measure & Trim Insulation. Measure and trim PlastiSpan HD insulation with
a utility knife or fine tooth
hand saw to fit around any openings such as windows.
6. Backfill. Backfill the foundation wall to the required grade using backfill material that will permit drainage to the drainage tile at the bottom of the wall. Grade the site so that the top soil is sloped away from the foundation wall.