Rooftop ductwork | Roofing Q&A | Spray Foam Technical Questions and Answers

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timrya Posted: Jun 03, 2017 02:57 PM	Rooftop ductwork I want to sprayfoam ductwork for a rooftop HVAC system. I want to use closed cell spray foam and coat it with Bayseal Bayblock II acrylic coating. According to the International Mechanical Code, all ductwork must have a flame spread index of <25 and a smoke developed index of <50. Does anyone have any experience with spray foam insulation on ductwork? Can a fire lock product be applied in conjunction with the Bayblock II coating to achieve the lower fire protection numbers needed?

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timrya

Posted: Jun 03, 2017 02:57 PM

Rooftop ductwork

I want to sprayfoam ductwork for a rooftop HVAC system. I want to use closed cell spray foam and coat it with Bayseal Bayblock II acrylic coating.

According to the International Mechanical Code, all ductwork must have a flame spread index of <25 and a smoke developed index of <50.

Does anyone have any experience with spray foam insulation on ductwork?

Can a fire lock product be applied in conjunction with the Bayblock II coating to achieve the lower fire protection numbers needed?

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