Polyurethane Foam Roof Coating

Sprayed Polyurethane Foam deteriorates quickly when exposed to the sun’s UV-rays. It needs to be coated with a UV protective coating immediately!

Why Consider a Polyurethane Foam Roof Coating Application?

A polyurethane foam roof coating can extend the life of your roof by 10 years or more. Elastomeric roof coatings are the roofing material of choice for this application.

Typically, polyurethane foam roofs have 1 – 2 inches of foam sprayed over an existing roof such as metal, built up or modified bitumen. It is then topcoated with an elastomeric roof coating to provide a watertight, UV protective membrane.

Polyurethane foam must be recoated every 10 years or so as a preventive measure.

BEFORE: This 10 year old polyurethane foam roof is badly weathered. Some of the foam is already exposed.

Polyurethane Foam Roof Restoration Process

Cleaning and Surface Preparation

The entire polyurethane roof was thoroughly washed using a 3,000 psi pressure washer. A biodegradeable degreaser was used to ensure a clean surface. All seams, flashings and penetrations were carefully sealed to render the roof watertight.

Priming

Priming ensures a good adhesion between the polyurethane foam roof surface and the elastomeric coating.

Top Coating

At least 30 dry mils of elastomeric roof coating is applied on the entire polyurethane foam roof in 2 coats.

AFTER: A leak-free, seamless elastomeric roofing membrane now covers the old, weathered polyurethane foam roof. If this polyurethane foam roof is properly maintained with periodic recoating, it can have an indefinite life expectancy.

All these benefits for about half the cost of replacement. What more can you ask for?

Don’t Put It Off Any Longer.

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Roof Restoration Tools

Pressure Washer

A pressure washer is mandatory for preparing a roof’s surface for coating application. Pressure washing removes embedded dirt, chalking and poorly adhered material. In most cases, 2000 PSI can adequately clean the surface without damaging adhered roofing laps, masonry or flashings. Higher pressure ratings can speed up cleaning provided that a wider nozzle is used to prevent damage to the existing substrate.

Clear-rinsing detergents may be used to improve cleaning. Be aware of any local restrictions regarding how the wash-off water must be treated or released into storm sewers or swales.

Airless Sprayer

An airless sprayer pump capable of developing 1,800 to 2,500 PSI material output pressure should be sufficient to spray a variety of acrylic coatings. A siphon hose on the material inlet typically is used to draw material directly from 5-gallon pails or 55-gallon barrels.

A spray gun with an extender wand allows for comfortable coating application without having to hold the spray gun uncomfortably close to the surface. A 517 tip is usually recommended for roof primers and 631 for elastomeric coatings. Tips are reversible for easy cleaning and clearing of occasional tip clogs.

Proper spray technique involves keeping a gun level with a roof’s surface at all times, maintaining a consistent distance between the spray tip and surface. Use a overlapping, crosshatch pattern to ensure complete coverage and a uniform finish.