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Spray Polyurethane Foam (SPF) with white Silicone coating Roof

jar546

jar546

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Does anyone have any experience with this type of roofing system in your area? I saw this for the first time on a commercial re-roof. I thought is was something new but found out it has been around for a long time, just not on any projects that I was on.
 
I just noticed you said "silicone" coating. I typically specify an acrylic coating with granules. Acrylic coatings work best in dry, hot environments as we have here in southern Arizona. A silicone coating would not perform well in this environment but would do well in a cooler, moist environment. Silicone coatings will crack, turn yellow, and pick up dirt over time in a location such as Phoenix.
 
RLGA said:
I just noticed you said "silicone" coating. I typically specify an acrylic coating with granules. Acrylic coatings work best in dry, hot environments as we have here in southern Arizona. A silicone coating would not perform well in this environment but would do well in a cooler, moist environment. Silicone coatings will crack, turn yellow, and pick up dirt over time in a location such as Phoenix.
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When I lived up north, I never saw it but here in Florida it apparently works and is approved for the coastlines in the highest wind zones. I think the humidity down here is the difference.
 
We have several roofs at our wastewater treatment plant that use a foam system. We are using closed cell spray polyurethane and the coating is specified as Durathane II. According to our plant people this has held up well.

Have seen lots of older trailer homes get this too but am not sure if they put protective coatings on them.

If others have experience with other top coatings I would like to hear about it.
 
SPF roofs must have a coating, otherwise, they wouldn't last a year.

There are three common types of coatings for SPF roofing: acrylic, silicone, and urethane.

Durathane II, mentioned above, is a type of urethane coating. Urethane coatings are superior to the other two coatings when it comes to chemical resistance; however, it does cost more than acrylics and silicone.
 
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