1/2 pound on metal roof | Ask Mason Knowles - SPF Consultant | Spray Foam Technical Questions and Answers | SprayFoam Magazine Q&A Forums

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thomas malloy Posted: Jul 24, 2009 07:30 AM	1/2 pound on metal roof A client wants me to spray open cell on his metal roof from the interior.Is there any precautions i should take any primers or should i use closed cell.
mason Posted: Jul 25, 2009 01:53 PM	Either open or closed cell foam can be sprayed to the underside of the metal deck. Metal tends to collect oil, grease and dust. make sure you clean it well. You may need a primer to enhance adhesion. (also be sure to check for rust and treat it accordingly) Ask your supplier for their recommentation. I have had good luck spraying the underside of metal decks but I have heard a few contractors mention that in colder climates, the closed cell foam may make loud cracking noises during cold weather. This is more likely with thicker applications of foam and with buildings that do not have stronger structural support.

Author

Comments

thomas malloy

Posted: Jul 24, 2009 07:30 AM

1/2 pound on metal roof

A client wants me to spray open cell on his metal roof from the interior.Is there any precautions i should take any primers or should i use closed cell.

mason

Posted: Jul 25, 2009 01:53 PM

Either open or closed cell foam can be sprayed to the underside of the metal deck.

Metal tends to collect oil, grease and dust. make sure you clean it well. You may need a primer to enhance adhesion. (also be sure to check for rust and treat it accordingly) Ask your supplier for their recommentation.

I have had good luck spraying the underside of metal decks but I have heard a few contractors mention that in colder climates, the closed cell foam may make loud cracking noises during cold weather. This is more likely with thicker applications of foam and with buildings that do not have stronger structural support.

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