Best way to attach foam board to concrete foundation?
jfincherok
| Posted in Green Building Techniques on
I’ve recently begun building energy effecient homes and would like input about how others are attaching rigid foam board to concrete stem walls. I’m using a pier on grade beam foundation which requires 8″-10″ of concrete to be covered. I’ve used all different types of adhesives and haven’t found any that stick right away. We usually have to lean a 2×4 against it or shovel some dirt against it.
Any suggestions would be appreciated. We are using Owens Corning 1″ foamular 150.
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Replies
James,
It sounds like you've got the right approach. Use a construction adhesive approved for rigid foam, and apply temporary pressure for several hours until the adhesive grabs.
Of course, you can always use mechanical fasteners, but that's probably more hassle than applying temporary pressure.
I have found a hilti powder activated fastener gun with nails designed for attaching foam to be extremely easy to use, but they are very expensive to buy.
Will-
What model Hilti do you use?
Some folks with attach furring strips through the foam and into the concrete as well to apply the clamping load prior to the adhesive drying. Depending on how much foam you put down, you can fasten your drywall to the furring strips.