Summer in Middle Tennessee is hard on a flat commercial roof. By mid-afternoon, a dark roof surface can absorb substantial heat, adding to the building’s cooling demand. That is one reason property owners consider spray foam roofing.
A spray foam roof is not a quick spray-and-go job, though. How well it performs depends on how the roof is prepared, how the foam goes down, how the coating is applied, and how the system is cared for afterward. Below, we answer common questions building owners have, one stage at a time.
For spray foam roofing in Franklin, TN, call Glick Roofing Systems at (800) 821-0205.
What Is Spray Foam Roofing?
Spray foam roofing, often called SPF roofing, is a system built from roofing-grade spray polyurethane foam applied to a suitable roof substrate. The liquid components expand and cure into a firm, closed-cell layer. A compatible protective coating then covers the foam to shield it from sunlight and weather.
Because the foam is sprayed in place, it forms a continuous field surface without the sheet laps used in systems such as TPO roofing in Franklin, TN. Edges, penetrations, drains, and transitions still require carefully designed details. Foam can conform around rooftop features, but a continuous surface does not eliminate the need for proper flashing and drainage.
Is a Spray Foam Roof the Same as Spray Foam Insulation Inside a Building?
No, and the difference is worth understanding before you get quotes. A spray foam roof is an exterior roofing system. It provides weather protection and adds insulation to the roof assembly.
Interior spray foam insulation is a separate application. Depending on the design, open-cell or closed-cell products may be installed in walls, attics, or beneath a deck. These products need suitable protective coverings and moisture-control details. They are not a substitute for an exterior roofing system.
This page covers spray foam as a roofing system only. Interior insulation work should have its own scope and pricing.
How Is the Roof Substrate Prepared Before the Foam Goes Down?
Preparation determines whether the foam can bond properly. The substrate is whatever the foam will be applied to, such as a suitable metal, concrete, or existing roofing surface. Not every substrate or existing roof is eligible.
A typical preparation process includes:
- Inspection and moisture assessment. Evaluate the roof’s condition, attachment, and supporting materials. On existing roofs, a suitable moisture survey or core samples may be needed to investigate hidden moisture.
- Removal of wet or failed material. Address wet insulation, loose roofing, and deteriorated components before covering them. Foam does not correct trapped moisture or structural damage.
- Cleaning. Remove contaminants and unsuitable surfacing using methods appropriate to the substrate and selected system. Any washing must allow sufficient drying.
- Securement and repairs. Correct loose components, damaged metal, and defective flashing as required.
- Primer where specified. Follow the foam manufacturer’s substrate preparation and adhesion requirements.
- Overspray and exposure controls. Plan protection for nearby equipment, walls, windows, vehicles, air intakes, and occupied areas as appropriate to the site.
How Is the Spray Foam Applied?
Once the substrate is prepared and conditions meet the product requirements, specialized equipment proportions and mixes the foam components during application. The mixture expands and cures into a rigid foam layer.
Foam is applied in passes within the manufacturer’s permitted thickness range until it reaches the project’s specified thickness. That thickness depends on the roofing system, insulation requirements, substrate, and design. Where appropriate, foam can be shaped to improve drainage, but persistent ponding needs a designed solution.
Weather plays a major role. Surface temperature, moisture, humidity, dew point, and wind must meet the application requirements. Work should pause when conditions would compromise the installation or prevent adequate overspray and exposure control.
Why Does Protective Coating Matter So Much?
Bare polyurethane foam deteriorates in sunlight. Its surface can discolor and erode, so the protective coating must be applied within the window allowed by the selected system.
Common coating options include silicone, acrylic, and urethane. Their suitability depends on product-specific properties, drainage, exposure, and compatibility. Some silicone products tolerate ponding water, while many acrylic systems require positive drainage. Urethane products can offer abrasion resistance, but no coating makes the roof immune to impact or service-traffic damage.
The number of coats, coverage, dry-film thickness, and any granules or walkway protection must follow the specified system. A light-colored coating can reflect sunlight and reduce roof-surface temperatures compared with a dark surface under similar conditions.
How Does Spray Foam Roofing Help With Energy Costs in Franklin?
It works in two ways. First, the foam adds insulation. Its thermal resistance depends on the product and installed thickness. Second, a reflective coating can reduce solar heat absorption.
Together, these features may reduce heat transfer and summer cooling demand. A properly designed continuous foam layer can also help limit air leakage at the roof assembly. Actual energy savings and comfort improvements depend on the building, existing insulation, HVAC operation, climate, and use. Savings are not guaranteed.
What Does Spray Foam Roof Maintenance Involve?
A spray foam roof needs ongoing maintenance. Much of the work centers on keeping the protective coating intact, while also checking flashing, drainage, and the underlying system.
Spring and fall inspections are a useful baseline, with additional checks after severe weather. Follow any specific manufacturer requirements. An inspector should consider:
- Thin or worn coating, particularly along service routes
- Punctures from tools, debris, or birds
- Blisters, cracks, and exposed foam
- Blocked drainage and persistent ponding
- Damage around HVAC units and other rooftop equipment
Repair methods depend on the extent of damage and moisture. Localized work may involve removing deteriorated material, installing compatible repair materials, and restoring the coating.
Full recoating may eventually be appropriate, but timing depends on coating condition, thickness, exposure, and manufacturer guidance. Recoating a suitable roof can extend service life. Any new or renewed warranty depends on the manufacturer’s written terms and approval; it is not automatic.
For related guidance, see our information on roof maintenance in Franklin, TN.
How Does Spray Foam Compare to TPO?
Both can suit commercial low-slope roofs. TPO is installed in sheets with heat-welded seams. Light-colored products are reflective, and the system can be used for suitable new construction, replacement, or recover projects.
Spray foam can conform to irregular shapes and add insulation as part of the roofing system. It may also help improve slope where the design allows. Its suitability for an existing roof depends on moisture, attachment, structural condition, compatibility, and applicable requirements.
Comparing systems should include the deck, current roof, drainage, rooftop details, budget, and long-term maintenance needs.
Is Spray Foam the Right Choice for Your Building?
If your facility has a flat or low-slope roof, high cooling demand, or recurring leaks around rooftop equipment, spray foam may be worth evaluating. Good results depend on a suitable substrate, necessary repairs, specified foam thickness, proper coating application, and ongoing maintenance.
For spray foam roofing in Franklin, TN, contact Glick Roofing Systems at (800) 821-0205 to discuss a roof evaluation.
FAQ
How long does a spray foam roof last in Franklin, TN?
A properly installed and maintained SPF roof can provide decades of service. Repairs and recoating can extend its useful life when the foam and supporting assembly remain sound. Longevity depends on exposure, installation, drainage, and maintenance.
Can spray foam be applied over my existing roof?
Sometimes. The existing assembly must be suitable, sufficiently dry, sound, securely attached, and compatible with the proposed system. Existing roof layers, structural capacity, and applicable requirements also matter. Wet or failed materials must be addressed first.
Can my business stay open during installation?
Continued occupancy may be possible, but it depends on the work, building layout, ventilation, and required exposure controls. Before installation, the project plan should address air intakes, equipment protection, overspray, access, and any temporary restrictions or shutdowns.
Can people walk on a spray foam roof?
Properly installed SPF systems can accommodate limited maintenance traffic, but concentrated loads and sharp objects can damage the foam or coating. Limit access to trained personnel and use compatible walkway protection where the system requires it.
What weather conditions affect installation?
Surface moisture, temperature, humidity, dew point, precipitation, and wind can affect application. Work must stay within the selected products’ requirements, including coating cure conditions and overspray controls.
How do I know when my spray foam roof needs recoating?
Worn or thinning coating, exposed foam, cracks, and localized damage need professional assessment. An inspection can help determine whether spot repairs or broader recoating are appropriate. Increasing ponding also needs a drainage investigation rather than coating alone.