Charles: That photo is closed-cell SPF, and it's not sprayed perfectly uniformly. As long as it has the minimum thickness required (3" on a ceiling here in the Atlanta area), it should be fine. I've discussed some problems with SPF installations in the articles listed in the Related Articles section above. This photo is from about 10 years ago, though, and has no ignition barrier.   Insulation Spray Coating
Henry 587 100% Acrylic Dura-Brite White Elastomeric Roof Henry 587 100% Acrylic Dura-Brite White Elastomeric Roof Coating is a premium high solids reflective roof coating. Its elongation peel strength and solar reflectance values offer weather protection high solar reflectivity and superior longevity when compared to economy grade reflective roof coatings. When cured it allows moisture vapor to vent ...  More + Product Details Close

Open-cell is also known as half-pound foam. It has an R-Value of 3.5-3.6 per inch, and its density is bout 0.5 pounds per cubic food. Low-density foams like these are made partially from raw biological materials Carbon dioxide or water is also used in the makeup. Open-cell uses far less material than closed-cell, but its R-Value is lower. Also, open cell requires a vapor retarder (like gypsum wallboard) and is riskier when used for roof sheathing. It's not highly recommended that you use open-cell insulation if you live in a cold climate unless you have that extra barrier. You should also compare how much money you spend versus how effective the open-cell insulation is wherever it's installed.

Henry 587 100% Acrylic Dura-Brite White Elastomeric Roof Henry 587 100% Acrylic Dura-Brite White Elastomeric Roof Coating is a premium high solids reflective roof coating. Its elongation peel strength and solar reflectance values offer weather protection high solar reflectivity and superior longevity when compared to economy grade reflective roof coatings. When cured it allows moisture vapor to vent ...  More + Product Details Close


A rule of thumb puts two thirds of the coating on the substrate and one third in the air. True HVLP guns use 8–20 cfm (13.6–34 m3/h), and an industrial compressor with a minimum of 5 horsepower (3.7 kW) output is required. HVLP spray systems are used in the automotive, decorative, marine, architectural coating, furniture finishing, scenic painting, and cosmetic industries. Spray Coating
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