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Spray Polyurethane Foam Roofing in South Fulton, GA
Spray foam suits roofs with odd shapes, many penetrations and a need for added insulation. Traffic and equipment follow from the building use, and the slope and drain plane follow from the roof zone. What changes the sequence is the coating: foam by itself breaks down in sun, so a protective coat does the roof's weather work. Our first walk reads the coating, then the foam beneath it.
SPF is applied as a liquid that expands into a rigid closed-cell foam. It forms a continuous layer with no seams and bonds to most substrates. The foam insulates and sheds water. The coating shields it from ultraviolet light. When the coating wears thin, the foam begins to erode. Recoating on a schedule keeps the system sound. Missing recoats are the usual reason an SPF roof fails.
South Fulton's city limits span more than 90 square miles and take in business districts on Old National and Roosevelt highways, part of the Camp Creek industrial-commercial area and an authority that lists industrial parks, flex space, mixed-use and office corridors. Foam is one option among several for roofs in any of them, and the first walk decides whether it fits.
Roof mechanism: coating wear and foam exposure
We look for chalking, thin spots, blisters, pinholes and bare foam. Chalking is a normal sign of surface wear. Bare foam is an emergency. It turns brittle and yellow, and it takes in water. Blisters can mean trapped moisture or poor adhesion. Pinholes let water in at points. Each defect gets a photograph and a position.
Atlanta runs past 95 degrees Fahrenheit on about seven days a year, and NOAA describes Georgia summers as long, hot and humid. That regional signal points to steady sun and heat on a coating. It is a reason to check wear, not a measure of any roof. We read coating thickness with a gauge where possible and record the readings.
Texture helps with reading wear. A fresh coat is smooth to slightly stippled. A worn coat shows the foam's pattern through it. We photograph the surface in raking light, since low-angle light shows thin areas clearly. The photographs are repeated at each visit from the same positions.
Inspection findings: hail, foot traffic and punctures
Foam is rigid, so impact leaves a dent or a crater. According to the NWS, large hail averages roughly seven days a year in northern and central Georgia, and April is the peak. Foot traffic crushes the surface along service routes. Dropped tools gouge it. Each damage type is mapped and counted, and craters are probed to see whether the foam is wet.
Damaging thunderstorm winds blow somewhere in the NWS warning area every month, about 19 days a year, and tornadoes can form in any month, mostly March through May. Foam adheres strongly, so wind damage is rare except at edges and flashings. We check those after any strong storm. We record what the roof shows after any storm, with dates.
Birds and pests can peck at foam. Penetrations that sit near trees may collect leaves and trap water. We list any animal damage and clear debris from drains and low spots, since foam does not like standing water on a worn coat.
Moisture reading: is the foam wet
Closed-cell foam resists water, but a breach lets it in, and wet foam loses its insulating value. An infrared moisture survey maps cool wet areas. A small core confirms it and shows the foam thickness. Wet areas are cut out to dry foam and re-sprayed. The boundary goes on the roof plan.
Core samples also show whether the foam is sound at depth. Delaminated or crumbling foam cannot hold a new coat. We record the foam's density by feel, its color and its bond to the deck. Foam in good condition takes a new coating over a cleaned surface.
Penetrations in foam are sprayed around and flashed with coating and fabric. The detail is only as good as the prep. We check each curb and pipe base for cracks in the coating, gaps at the foam edge and fabric lifting. Failed details are reinforced with new fabric and coating. The repair is mapped and photographed.
Drains in foam roofs sit in sumps formed in the foam. A roof drain that backs up in a storm floods the nearby foam, so strainers are cleared and flow is tested. Sumps are checked for cracks in the coating, since a crack at a drain is a direct path to the deck.
Scope options: recoat, repair or replace
A sound roof with a worn coating takes cleaning and a new coat, usually silicone or acrylic. Local damage takes patch foam and a coat over it. Wide wet areas or crumbling foam call for removal and replacement. A restoration coating program sets recoat intervals so the foam is never left bare.
In South Fulton the 2024 IBC and its Georgia amendments have governed new permits since January 1, 2026. On the energy side, the 2015 IECC and its Georgia amendments remain the standard. Foam adds insulation, which the energy review credits, and the scope states the thickness and the assumptions.
Cost follows area, foam thickness, coating type, penetrations and access. Re-spraying foam in wet areas adds labor. Recoating a sound roof costs far less than replacing foam. The scope lists each driver as a separate line and gives the recoat interval in plain terms.
Timing for recoating matters. Recoat in the dry stretches of late summer or early fall, with the roof clean and fully dry. Hold the work if rain is forecast within the cure time. We log temperature, humidity and wind at each pass.
Access and sequencing: application conditions
Foam is picky about weather. It needs a dry substrate, moderate temperature, low wind and low humidity. Georgia's humidity and afternoon storms make the window short. Application starts early and ends before storms. Overspray is a risk, so cars, glass and neighbors are covered, and wind speed is checked before each pass. Wherever parking sits close to the building, as it can along South Fulton Parkway, cover goes up first.
The dry-in limit is set each day, and no foam goes down that cannot be coated the same week. On tight sites where overspray is a concern, a sheet system such as TPO may fit better. At closeout the owner keeps dated photographs, thickness readings, product data and a plan with the repaired areas marked.
Rooftop units, solar racks and antennas add traffic and penetrations. Each trade is told where to walk, and walk pads cover the routes. Any added penetration is flashed by us, so the coating stays continuous and the warranty terms are respected. Those routes are marked on the plan.
Send the roof plans and the access window
How often does an SPF roof need recoating?
The interval depends on the coating type, thickness and exposure, and wear is checked at each inspection. We recommend a yearly look and a recoat before any bare foam shows.
What happens if foam is left bare?
Sun turns it brittle and it takes in water. Bare areas are cleaned, patched with new foam where needed and coated at once. Photograph them first.
Can spray foam go over an old roof?
Often, if the old roof is dry, clean and firmly attached. A moisture survey and a pull test show whether it can hold the foam. Wet areas come out first.
Is overspray a real concern?
Yes. Wind carries fine foam droplets onto cars and glass. Cover what is nearby, check wind before each pass and keep a log of conditions.
How does hail affect foam?
It leaves dents and craters, and deeper strikes break the coating. Count them per test square, probe for moisture and recoat damaged areas.