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A Practical Guide to Insulating your Exterior Foundation Walls with EPS Rigid Foam

June 28, 2017

It’s that time of year when building is in full swing. You can hardly drive down the road without seeing a new home in some stage of the construction process. While building a new home is exciting, there are stages that are not always glamorous, and can be sometimes forgotten, or even literally buried in the dirt. However, these parts of your building are some of the most important elements to the success of your home. As the old adage goes, you have to start on a good foundation.

Enerspan Insulation is made with Neopor by BASF for enhanced R-value – Making it a great exterior foundation insulation

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.

That’s where we come in. If you are doing a poured or block foundation wall, it is important to insulate the outside of that wall with code approved insulation. Be sure to check with your building code before getting started. We have put together a step by step installation guide for a start to finish seamless install….

Step 1: Building Code
We’ve already covered that, so you have confirmed what you need for the codes in your region.

Step 2: 2. Install Insulation.
Ensure that the concrete surface is dry and free of dirt. Starting from a corner, apply Plasti-Fab EPS 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. 

Step 3: Measure & Trim Insulation.
Measure and trim the EPS insulation with a utility knife or fine tooth hand saw to fit around any openings such as windows.

Step 4: Drainage at Footing.
Place drainage tile covered by coarse gravel at the base of the wall, as per local building code.

Step 5: Protect Exposed Insulation.
EPS 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.

Step 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.

 

Take a look at these excellent insulating products for below-grade insulation on your exterior foundation:

PlastiSpan HD Insulation | PlastiSpan 2o Insulation | DuroFoam Plus HD Insulation | Durofoam Plus 25 Insulation | EnerSpan Insulation 

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