Commercial Roof Restoration & Coating Systems
A fluid-applied silicone or acrylic coating restores a sound but aging flat roof in place — no tear-off, no landfill, a fraction of replacement cost. Grandview moisture-tests, scopes, and installs commercial roof coating systems across Utah County and Salt Lake County under a B100 general contractor license.
When a coating beats a new membrane, and when it can’t
A restoration coating is the right call when the roof is sound, mostly dry, and simply worn — chalking modified bitumen, a faded TPO membrane with brittle seams, a metal roof with rusting fastener heads, or an older built-up roof that has lost its surfacing. The coating seals seams and penetrations, adds a reflective weather surface, and buys ten to twenty years before anyone discusses a tear-off.
It is the wrong call when the roof is already a sponge. Wet polyiso in a core cut, or more than roughly a quarter of the area reading wet on a moisture survey, means the water is in the assembly, not on it, and a coating would trap it. That roof needs a replacement, or at minimum a tear-out of the wet sections first. We’ll tell you which after testing, not after the invoice.
Fully adhered EPDM coats well with the right primer; ballasted EPDM does not.
Silicone, acrylic, or urethane: picking the chemistry
Silicone is the default for Utah flat roofs. It stays flexible through the Wasatch Front’s hundred-plus freeze–thaw days a year and shrugs off ponding water — useful where snowmelt sits behind a frozen drain for a week in February. The trade-off: it picks up dirt, is slick when wet, and can only ever be recoated with more silicone.
Acrylic costs less and breathes, but weakens under standing water and needs dry, above-50°F weather for about 24 hours after each coat. In Utah that means a late-May-to-September window with morning starts, because a July monsoon cell can wash an uncured coat straight into the scuppers.
Polyurethane is the hard-wearing base coat under silicone around rooftop units and on exposed-fastener metal.
Whatever the chemistry, a white top coat behaves as a cool roof, which the Department of Energy credits with lower summer cooling loads — at 4,500-plus feet under Utah sun, the one roofing upgrade a tenant notices on the power bill.
How a roof coating restoration actually goes on
The coat is the fast part. The prep is where the warranty is earned or lost.
- Moisture survey and core cuts. An infrared or capacitance scan, confirmed with core cuts. Wet areas are mapped and priced for tear-out before anyone opens a pail.
- Adhesion test patches. Primer and coating go down on a few square feet of the real substrate and are pull-tested after cure — bond failure shows up on a test square, not on 20,000 feet.
- Clean and repair. Power washing, rust treatment on metal, new pipe boots and drain bowls. Every seam, fastener head, and penetration gets mastic and polyester fabric — the “three-course” detail — because a coating won’t bridge an open lap on its own.
- Prime where the chemistry needs it. Single-ply gets a bonding primer, metal a rust-inhibitive one, and aged modified bitumen a bleed-blocker so asphalt doesn’t stain through the white.
- Coat to a measured thickness. Warranties are written in dry mils — commonly 20 for a ten-year and 30-plus for a twenty-year silicone system. We gauge wet-film thickness as we go and keep the readings; a roof that reads 12 mils is a short warranty wearing a long one’s paint.
- Close-out. Granulated walk paths to rooftop equipment, the manufacturer’s final inspection where the warranty calls for one, and the registration in your file.
Occupied buildings mostly never notice: no dumpster, no tear-off noise, no open deck waiting on tomorrow’s weather.
What does a commercial roof coating cost in Utah?
As a ballpark planning number, a silicone restoration system on a commercial flat roof in Utah County or Salt Lake County typically runs about $2.50 to $5.50 per square foot, including cleaning, seam reinforcement, primer, and two coats to warranty thickness — roughly half what a new TPO assembly costs, which is the whole argument for coating a roof that qualifies. Planning numbers, not a quote.
- Wet-insulation tear-out. Each area the survey flags is cut out and infilled before coating. A roof at 5 percent wet is a coating job; at 30 percent it is becoming a replacement.
- Warranty length. Ten-, fifteen-, and twenty-year systems differ mainly in dry mils, which is to say gallons; twenty years can add a third or more to the material line.
- Substrate and penetrations. Metal needs fastener-by-fastener detailing; aged granulated surfaces drink the first coat; forty curbs and vents cost more to three-course than four on a roof twice the size.
Restoration is generally treated as maintenance rather than replacement, which in many cities means no permit and no trigger for the insulation upgrades a tear-off brings — verify with your city’s building department, since practice differs between Provo, Salt Lake City, and the faster-growing Lehi and Saratoga Springs offices.
Most coating projects start with a roof inspection. The full range of systems we install lives on the roofing page and under site, structure & envelope; our general contractor license is verifiable through Utah DOPL.
Questions we actually get
How long does a silicone roof coating last in Utah?
Plan on ten to twenty years depending on the dry-mil thickness applied, with the manufacturer warranty matched to it. Utah’s elevation and UV are hard on most roofing, but silicone is among the most UV-stable chemistries, and when it eventually thins it is cleaned and recoated rather than removed.
Can you coat a roof that leaks right now?
Only after we find where the water went. The leak gets repaired first, then a moisture survey shows whether the insulation around it is wet. Dry: local repair, then coat. Wet: cut out and infill, then coat. Coating over a wet roof seals the water in and fails within a season, so we won’t do it.
Can you coat a shingle or steep-slope roof?
Not as a restoration system. Coatings are engineered for low-slope membranes, metal, and built-up roofs where they form a continuous film. Shingles are meant to shed and overlap, and a coating voids most shingle warranties. For a worn pitched roof, the honest options are repair or replacement.
What time of year can a roof coating go on?
Late spring through early fall. Silicone tolerates cooler nights, but every chemistry needs the surface dry and above freezing through cure, and monsoon-season afternoons push us to morning application with a weather check at noon. A coating applied into a cloudburst is a coating applied twice.
Tell us what your flat roof is doing
Send us the roof’s age, the membrane type if you know it, and photos of the worst areas. We’ll moisture-test it and give you a straight read on coating versus replacement — a reply within a couple of hours during business hours, a day at most.