We install spray foam roofing in Louisville over metal panels and flat roofs that need insulation, filling panel ribs to a smooth surface and sealing it with a coating.
Foam earns its cost when the building needs insulation. These conditions sort which roofs get foam and which only need a coating.
| What We Find | Foam Plus Coating | Coating Only | Fix First |
|---|---|---|---|
| Heated or cooled space under bare metalFoam adds insulation set by its thickness. | Foam Plus Coating | Coating Only | Fix First |
| Deep ribs with leaking laps everywhereFoam covers every lap in one layer. | Foam Plus Coating | Coating Only | Fix First |
| Unheated warehouse or barnCoating alone seals it for less. | Foam Plus Coating | Coating Only | Fix First |
| Short rooftop curbs and low edge metalCurbs and flashing get raised before foam. | Foam Plus Coating | Coating Only | Fix First |
| Wet insulation or sagging purlinsStructure and a dry substrate come first. | Foam Plus Coating | Coating Only | Fix First |
Some metal buildings leak and lose heat at the same time. These conditions point toward foam.
Foam always gets a coating on top. These are the topcoat setups we use over it.
Holds up where water sits on flat foam roofs and stays flexible through freeze nights. Later recoats stay with silicone.
Best on: Flat roofs and low spots
A bright white, water-based topcoat for sloped or well-drained foam. It needs dry, warm weather to cure and recoats easily.
Best on: Sloped foam over metal
Edges, curbs, and drains get extra coating thickness where foot traffic and water concentrate on the foam.
Best on: Roofs with service traffic
What foam plus coating adds over a coating alone, for buildings with heated or cooled space under the roof.
Closed-cell foam adds about R-6 per inch on top of the existing panels, according to a U.S. Department of Energy Building America guide, so the old roof stays in place.
Foam fills ribs and bridges laps, screws, and seams in one continuous layer, leaving far fewer joints for water to find than a panel-by-panel seal.
Weight stays low: foam is far lighter than a new roof system, though heavier than coating alone. Purlins are still checked before it goes on.
When the topcoat wears, the foam is cleaned and recoated instead of replaced, as long as it stays dry and firm.
Tell us how the space below is used and whether it is heated or cooled. That decides whether foam or a coating alone makes sense.
Foam work depends on weather and careful masking. These steps keep it on the roof and off everything else.
We take moisture readings, check purlins from inside, and measure curb heights, edge metal, and door thresholds the new surface will meet. Wet insulation comes out before foam.
Panels are washed and dried, loose fasteners fixed, and rusted areas primed. Edge metal and short curbs get raised so the finished foam still sheds water at flashing.
Rooftop unit intakes are shut down or covered, nearby vehicles masked, and wind is watched through the day, since foam overspray travels.
Closed-cell foam goes on in passes to the thickness set for the insulation target, filling ribs and building slope toward drains where needed.
Base and top coats follow right after the foam, since bare foam breaks down in sunlight. Thickness is checked across the roof before we leave.
Every foam roof gets a coating. These pages cover the systems that go over or beside it.
Silicone topcoats suit flat foam roofs where water lingers after storms.
See Silicone Roof CoatingMetal sections that only need sealing get a coating without foam.
See Metal Roof CoatingInsulation, tax, and utility questions owners ask about foam over metal.
Question about your own roof?
Call UsFoam makes sense when the building needs insulation or the panels have deep ribs and many leaking laps, while a coating alone fits a roof that only needs sealing and rust protection. Closed-cell foam adds about R-6 per inch, per the Building America spray foam guide. It fills the ribs smooth, weighs more than coating, and short curbs need raising.
It can. IRS Publication 946 lets a roof improvement to an existing nonresidential building count as qualified real property under Section 179. For tax years beginning in 2026, the maximum deduction is $2,560,000, reduced once qualifying purchases pass $4,090,000. Improvement versus repair is a tax question, so ask a CPA to review the invoice categories.
For coatings alone, no. LG&E and KU business rebate pages name insulation as an eligible custom improvement, while roofing and coatings are absent, so a foam job would go through their custom review. Bring the account number, roof area, and planned foam thickness per section, get any decision in writing, and note that gas-only customers are excluded.
Thick enough to fill the panel ribs and reach the insulation value the building needs. On exposed-fastener R-panel, the first pass fills the ribs, and later passes add the inches that set the R-value. Edge metal and curbs are raised to match before spraying.
Bare foam breaks down in sunlight and turns powdery on the surface. Caught early, the fix is simple: the area is cleaned, damaged foam is cut out and refilled, and new coating goes on. Walk the roof each spring and after hail to spot thin topcoat.
Tell us how the building is heated or cooled and how big the roof is. We will measure curbs and moisture and tell you if foam fits.
Leave a name and number and we will call you about the roof.
Or call now: (502) 281-7941