Clogged Drains and Scuppers
Leaves, gravel, and old patches choke drains and scuppers, so water backs up across the low corner. We clear and test each drain before anything is coated.
As an Omaha silicone roof coating contractor, we apply thick silicone to low-slope metal and flat roofs where water sits near drains and box gutters.
Omaha silicone roof coating is the pick for flat and low-slope sections that hold water. Match your roof below to see which job usually fits.
| What You See On The Roof | Coat Now | Repair, Then Coat | Replace First |
|---|---|---|---|
| Low-slope metal with water at end laps | Sometimes | Usually Fits | Rarely |
| Flat section ponding around a clogged drain | Rarely | Usually Fits | Rarely |
| Old silicone that is dirty but still adhered | Usually Fits | Sometimes | Rarely |
| Acrylic coating peeling in ponded areas | Rarely | Usually Fits | Rarely |
| Wet insulation across the low end of the roof | Rarely | Sometimes | Usually Fits |
Silicone tolerates ponding water, but the cause of the ponding still gets fixed. These four checks come first.
Leaves, gravel, and old patches choke drains and scuppers, so water backs up across the low corner. We clear and test each drain before anything is coated.
A pond that never dries can mean a deflected deck or crushed insulation below. Probing and moisture readings tell us whether coating is enough or the deck needs repair.
Silicone bonds well to old silicone, while acrylic and asphalt coatings need adhesion tests and the right primer. Bleed-through from asphalt gets a blocking primer.
Equipment curbs sit in the path of water moving to drains. Their flashing gets rebuilt with fabric and silicone so the curb sheds water instead of trapping it.
Silicone goes over several substrates. The adhesion test and the roof walk decide which build your roof gets.
| Option | Where It Fits | Prep It Needs |
|---|---|---|
| Silicone over primed metal | Low-slope R-panel with lap ponding | Rust primer, screws, lap fabric |
| Silicone over old silicone | Dirty but well-adhered silicone roofs | Deep clean, patch tears, one new coat |
| Silicone over single-ply | Aged TPO or EPDM flat sections | Clean, primer, seam reinforcement |
| Silicone over built-up roof | Gravel-free BUR with granules | Blocking primer for asphalt bleed |
Silicone keeps the existing roof and resists the standing water that wears other coatings. Compare it with tearing the low-slope section off.
| Roof Factor | Coat The Roof | Replace The Roof |
|---|---|---|
| Planning cost | About $2.50 to $4.00 per sq ft | About $5 to $8 per sq ft |
| Standing water after storms | Silicone film holds up under it | New roof still needs drains fixed |
| Warehouse use during work | Docks and racking stay in use | Areas under tear-off need protection |
| Waste hauled away | Empty pails only | Old membrane and insulation |
| Next recoat | Clean and add silicone | Full repair cycle on the new roof |
Call and tell us where it collects and how long it stays. We check the drains, the deck, and the insulation under it on the roof walk.
Silicone jobs follow this sequence so the film bonds and stays on through standing water.

We map every pond, test drains, take moisture readings across the low areas, and run adhesion tests if an old coating is on the roof.
Drains, scuppers, and gutters get cleared and any deck repairs are made, so ponding is reduced before the coating goes down.
Silicone grips only clean surfaces, so the roof is pressure-washed and, where needed, washed again with a cleaner the maker approves.
Primer goes where the adhesion test calls for it. Seams, laps, drains, and curbs get fabric set in a silicone detail coat.
High-solids silicone is sprayed or rolled to the specified dry mils in one or two passes, with wet-mil readings taken across the roof.
Owners often coat the pitched and flat parts of one building with different systems.
Pitched metal panels on the same building take the full metal coating build with screw and rust work.
Commercial metal roof coatingSteeper metal sections that shed water quickly can take acrylic while the flat sections get silicone.
Acrylic roof coatingFoam under a silicone topcoat adds insulation and builds up low spots on a flat roof.
Spray foam roofingWhat owners ask most about silicone on low-slope roofs.
Silicone collects dirt, which dulls its bright finish over time, and wet silicone is slick to walk on. Most products will not stick to cured silicone, so every later recoat is silicone too. Walk pads near equipment cut wear from foot traffic.
One or two, set by the maker's dry mil spec. High-solids silicone builds thickness fast, and a second pass covers pinholes on ribbed panels. Laps and screws get a detail coat before either pass.
Film thickness and prep set it. Thicker builds earn longer service terms from makers, and silicone stands up to ponding well. Dirt, foot traffic, and unrepaired hail damage cut that life, so walk the roof yearly.
It plans within about $2.50 to $4.00 per square foot. Prep, drain repairs, the specified thickness, and coat count place your roof in that range. Silicone often needs fewer passes, which offsets its higher price per gallon.
Better than most water-based coatings. Silicone resists breakdown under standing water, which is why it goes on low-slope roofs and near drains. We still fix the clogged drain or sagging deck that caused the pond.
Often, after an adhesion test. Acrylic that is peeling where water ponds comes off first, and firm acrylic gets cleaned and primed with the product the silicone maker lists. We test small patches on your roof and wait for the results before ordering material.
Wet silicone is slick, and a dirty silicone surface can be too. Walkway pads from the roof hatch to each rooftop unit give technicians a safer path and cut wear on the coating where boots land most.
Box gutters on metal buildings hold water and debris, which wears water-based coatings fast. Silicone with fabric at the gutter laps handles that standing water once the outlets are cleared and any rusted gutter bottoms are patched with new metal.
Tell us where water stands on your roof. We check the drains and price a silicone system for it.