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Exterior Insulation for Foundation Walls

September 10, 2012

Written by Melissa Carruthers
Follow me on Twitter: MelissaC_PFB

To start off insulating our Plasti-Fab Solutions Home, I would like to note that we have multiple products that are an excellent solution for the exterior basement wall application; *PlastiSpan®, **PlastiSpan® HD, and ***DuroFoam® Insulation. In this blog, I will speak to PlastiSpan HD, but keep in mind the other products can be used as well.

We will begin with using PlastiSpan HD insulation on your exterior basement walls. Insulating your basement walls helps eliminate the transfer of heat and cold through them. This is a step you should really consider because you will save money in heating and cooling, while giving you and your family a more comfortable basement, and more space for everyone to enjoy.

Exterior basement walls are a little bit tricky (and dirty) so make sure you are up to the challenge and dressed appropriately. The first thing to do is make sure that the concrete surface is dry and free of dirt. Now you will need to apply a damp proofing compound to the exterior face of the concrete wall from the top of the footings to above the finished grade. (If an asphalt emulsion is used, allow it to cure before installation of PlastiSpan HD). You may use whatever type of damp proofing compound you want, and you only need to apply one if one does not already exist on the exterior of the wall.

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Let’s start in a corner and apply the PlastiSpan HD insulation from the top of the foundation wall to the top of the footing. Use a foam safe adhesive like PL300 to attach the foam. You will need to measure and trim PlastiSpan HD insulation with a utility knife or fine tooth saw to cut around any openings such as windows.

When you finish this, place a 6” deep layer of coarse gravel against the bottom edge on the PlastiSpan HD insulation and over the drainage tile. There will be exposed insulation so you need to protect it. 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 used. When this is all complete, 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 soil so that the top soil is sloped away from the foundation wall.

Your exterior basement walls are now insulated!

*Learn More about PlastiSpan Insulation.
**Learn More about PlastiSpan HD Insulation.
***Learn More about DuroFoam Insulation.

Next week: Interior Insulating Sheathing for Foundation Walls

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