Spray over foam board | Ask Mason Knowles - SPF Consultant | Spray Foam Technical Questions and Answers | SprayFoam Magazine Q&A Forums

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Author	Comments
Tom Wade Posted: Oct 25, 2013 12:15 PM	Spray over foam board To cut cown on anouont of spray foam needed can you spray over foam board?
jimcoler I have over 10 years of experience specifying and installing open and closed cell spray foam. I've sold my business but I'm still selling for the new owners and consulting on large and custom specific jobs. I've expanded my knowledge into t Posted: Oct 27, 2013 10:23 PM	I don't know why you would want to waste your time and money installing the insulation board and then spray foam when the spray foam is a better product at about the same price with less time!
mason Posted: Oct 31, 2013 10:32 AM	We tried it on cold storage projects and on roofing projects with some success. But, the foam board must be fastened securely with no gaps behind it. Also, EPS and XPS has a melting point of around 160 degrees F. So the first pass needs to be fairly thin (around 1/2 to 3/4 inch thick) to keep the heat on the EPS or XPS below that temperature. You should also check with your foam supplier, They may have restrictions against using a foam board with SPF due to the potential for problems.

Author

Comments

Tom Wade

Posted: Oct 25, 2013 12:15 PM

Spray over foam board

To cut cown on anouont of spray foam needed can you spray over foam board?

jimcoler

I have over 10 years of experience specifying and installing open and closed cell spray foam. I've sold my business but I'm still selling for the new owners and consulting on large and custom specific jobs.

I've expanded my knowledge into t

Posted: Oct 27, 2013 10:23 PM

I don't know why you would want to waste your time and money installing the insulation board and then spray foam when the spray foam is a better product at about the same price with less time!

mason

Posted: Oct 31, 2013 10:32 AM

We tried it on cold storage projects and on roofing projects with some success. But, the foam board must be fastened securely with no gaps behind it. Also, EPS and XPS has a melting point of around 160 degrees F. So the first pass needs to be fairly thin (around 1/2 to 3/4 inch thick) to keep the heat on the EPS or XPS below that temperature.

You should also check with your foam supplier, They may have restrictions against using a foam board with SPF due to the potential for problems.

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