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Jeff Farris Posted: Jul 10, 2007 12:41 PM	Spray Foam to Stucco Wrap Are there any know adverse issues with spray foam interaction with asphalt stucco wrap or the stucco foam itself?
mason Posted: Jul 10, 2007 12:50 PM	Sprayfoam typically adheres well to asphalt surfaces. Having said that, I don't have personal experience installing sprayfoam over Stucco Wrap. I would recommend testing the adhesion with a few samples of it. After the foam cures (a couple of hours)take a core sample out of the foam down to the substrate. The foam should not come away easily and pieces of the foam should be left on the substrate. This is called cohesive foam failure and is the best adhesion. If there is a light mechanical bond, I would find a compatible adhesive primer. Also ask your supplier for their experience and recommendations. Now as the EPS or XPS. I've found closed cell foam to adhere well to polystyrene foam but others have had problems. But again spray a small sample and test the adhesion. Also, ask your supplier for recommendations.

Author

Comments

Jeff Farris

Posted: Jul 10, 2007 12:41 PM

Spray Foam to Stucco Wrap

Are there any know adverse issues with spray foam interaction with asphalt stucco wrap or the stucco foam itself?

mason

Posted: Jul 10, 2007 12:50 PM

Sprayfoam typically adheres well to asphalt surfaces. Having said that, I don't have personal experience installing sprayfoam over Stucco Wrap. I would recommend testing the adhesion with a few samples of it. After the foam cures (a couple of hours)take a core sample out of the foam down to the substrate. The foam should not come away easily and pieces of the foam should be left on the substrate. This is called cohesive foam failure and is the best adhesion. If there is a light mechanical bond, I would find a compatible adhesive primer. Also ask your supplier for their experience and recommendations.

Now as the EPS or XPS. I've found closed cell foam to adhere well to polystyrene foam but others have had problems. But again spray a small sample and test the adhesion. Also, ask your supplier for recommendations.

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