Spray Foam Roofing in Gilbert, AZ

Where foam belongs on a Gilbert house

Gilbert is a tile town, so foam is rarely the whole roof here. It is the answer for the flat parts. Around the lakes, a Windhaven home in The Islands built in the late 1980s describes its roof as tile with rolled and hot-mop sections, and that mix is where foam earns its keep. Low-slope roofs over patios, enclosed porches and room additions are the other usual candidates.

Hot mop is hot asphalt mopped over layers of felt. After enough Gilbert summers it blisters, pulls back from the edges and splits around pipes and vents. Patch one crack and the next one opens a foot away.

Spraying over the old hot mop

First we probe the existing roof. Anything wet or soft gets cut out and rebuilt, because foam should never seal moisture in. If the surface is dry and still stuck fast, we clean it and spray directly over it, so there is no tear-off and no load of old roofing hauled away. The foam leaves the gun as a liquid, swells up and cures into a single closed-cell layer stuck tight to the roof below. It climbs around pipe jacks and vent stacks on its own, which makes it self-flashing, and it leaves no seams for water to work into.

The transition to the tile slope gets the most attention. Every drop that leaves the tile crosses that line, so it has to be built to shed water, not hold it.

After curing, the foam gets an elastomeric coating, or gravel if you prefer. The coating blocks UV, the main thing that breaks foam down in Arizona, and a light color reflects heat instead of soaking it up. Our write-up on what foam and a white coat did to a 153-degree metal roof shows how big that difference can be.

Keeping Gilbert foam coated

Foam can last a very long time, but only while the coating stays intact. That coating is the wear layer, and it needs a fresh coat on a schedule. Let it go and UV starts eating into the foam itself. Once it cures, the foam takes ordinary foot traffic, so we can inspect it and your AC tech can service equipment up there, as long as nobody drags tools across the surface. On inspections we flag thin, chalky or blistered spots early, while a recoat still solves the problem. For the coating side in more depth, see how base coats and glare control protect foam.

Gilbert spray foam roof pricing

Typical totals from our price sheet for a 1,500 sq ft flat roof: about $7,125–$9,000 to foam over the existing roof ($4.75–$6 per square foot), or $4,800–$6,300 on new construction ($3.20–$4.20 per square foot). See every range on our pricing page.

Foam pricing in Gilbert starts with the flat area's square footage and how much of the old hot mop is wet. Dry, sound surfaces take foam directly. Wet sections come out first, which adds labor and material. Foam thickness, coating or gravel, the count of vents, pipes and equipment stands to work around, and the tie-in to the tile all move the figure. Recoating an existing foam roof is a smaller job than a new one. Try the foam estimator for a ballpark before we measure.

Want to know whether your flat section can take foam over the top? Call (602) 799-6837. We will probe it, show you any wet spots and give you a free written quote.

If the real trouble is the tile slope next to it, see tile underlayment work in Gilbert. We also handle composition shingle roofs in Gilbert and foam, coatings and membranes on Gilbert commercial buildings.