Here is the process:

Polyurethane foam is spray applied to an acceptable roofing substrate typically at a minimum thickness of 1" or greater.

An elastomeric base coating is applied at a rate of 1.5 gallons per 100 square feet. At this time all pipes, curbs and vertical walls are also coated.

A second topcoat of elastomeric coating is applied at a rate of 1.5 gallons per 100 square feet and a #6 aggregate is broadcast into the wet coating.

The final step is a mixture of a lightweight cementitious topping applied at a rate to achieve a thickness total of 1/8-1/4" over the horizontal field of the roof surface.

Cementitious topped foam roofing systems are good roofing systems and can give you up to 25 to 30 years performance, but they are not a sustainable roofing system.

Click here to find out the answer to Division Seven Systems most frequently asked question. It is in regards to cementitious topped foam roofing systems.