Flat Roof Silicone Coating in Los Angeles
Silicone coating for flat and low-slope roofs on homes, garages, and apartment buildings across Los Angeles County, from an ASC Certified Contractor. Estimates are free.
- ASC Certified Contractor
- Polyglass Premio Select
- CSLB #1119699 (C-39)
Silicone Flat Roof Coating for Homes and Apartment Buildings
Flat roof silicone coating covers a worn torch-down, built-up, TPO, or foam roof with a continuous layer of silicone that keeps working where water sits after rain. It suits a flat roof that is still dry and well attached but losing its surface, and it renews that surface without a tear-off.
We coat flat roofs on houses, garages, additions, and apartment buildings across Los Angeles County. Overhead Roofing is an ASC Certified Contractor, and silicone systems we apply can qualify for a 20-year manufacturer warranty, subject to the manufacturer’s warranty terms. Our license, CSLB #1119699, is in the C-39 Roofing classification.
For how silicone compares with acrylic and what a full coating job involves, see our silicone roof coating page. If your flat roof leaks today, start with flat roof repair.
ASC Certified Contractor
20-year, subject to terms
Dry within 48 hours of rain
Premio Select, #9272
Flat Roofs That Can Take a Silicone Coating
Most flat roofs in Los Angeles are torch-down modified bitumen, built-up roofing with gravel, TPO, or spray foam. Silicone can go over each of them when the roof is in the right condition:
- Torch-down cap sheet that is chalky or losing granules but still bonded
- Built-up roofs after the loose gravel is removed and the surface is cleaned
- TPO membranes that are well attached, with seams that are intact or repaired
- Spray foam roofs whose old coating is worn but whose foam is still sound
- Older coated roofs that are due for a silicone recoat
A flat roof is a poor candidate when cores find wet insulation across large areas, the deck is soft, or blisters and splits cover much of the surface. Those roofs need flat roof replacement. On TPO, the coating maker’s guidance and an adhesion test decide which primer is used, and some single-ply roofs are better replaced than coated.
Ponding Water, Drains, and Scuppers
California’s building code describes positive roof drainage as a roof that drains within 48 hours after rain. Many older flat roofs in Los Angeles fall short of that. Low spots form where the deck has sagged or around drains that sit too high, and water stays for days.
Silicone is made to tolerate that standing water, which is the main reason it is chosen for flat roofs. It does not add slope, though, and ponding still adds weight and collects dirt. Before coating, we check that:
- Roof drains, scuppers, and gutters are clear and flowing
- Drain bowls and scupper openings are not set above the roof surface
- Leaves and debris are cleared out of low spots
- Areas where water sits for days are marked on the estimate
Where water collects against a wall or behind a chimney, a cricket or an added drain may be part of the repair work, priced separately so you can decide.
Call (877) 557-7778, or send photos through the form below. Office hours are Sunday through Friday, 8 a.m. to 5 p.m.
Getting a Flat Roof Ready for Silicone
The details on a flat roof are where leaks start, so each one is repaired before the coating goes on:
Gravel, granules, and dirt
Loose gravel on a built-up roof is removed, and loose granules on torch-down are swept and washed away. Silicone bonds to the surface underneath, so anything that can move or flake has to come off first, and the roof dries completely before coating.
Blisters and open laps
Blisters are cut open, dried, and patched with the roof’s own material. Open laps on cap sheet or membrane are resealed, and seams are reinforced with fabric set into a base coat so they move with the coating instead of cracking through it.
Parapets and wall flashing
Where a flat roof meets a stucco parapet or wall, the base flashing and counterflashing are checked and resealed. Coping joints on top of parapets are a common leak point and get sealed before the field of the roof is coated.
Pipes, curbs, and pitch pans
Plumbing vents, HVAC curbs, and equipment stands are wrapped with fabric and base coat. Old pitch pans are cleaned and refilled, or replaced with a cleaner detail, because the filler dries out and pulls away from the roof over time.
Drains and scuppers
Drain clamping rings and scupper liners are checked, cleaned, and sealed into the coating with reinforcing fabric. A drain that leaks around its bowl will leak under any coating, so it is repaired first.
Coat the Flat Roof or Replace It
A coating makes sense when the roof is dry, attached, and mostly sound, and the problems are surface wear and a few failed details. Replacement makes more sense when:
- Cores find wet insulation or soft decking across large areas
- Blisters, splits, and failed seams cover much of the roof
- Earlier patches cover much of the roof and keep failing
- The deck has sagged enough that water stands for days in wide areas
When replacement is the right call, our flat roof replacement page covers tear-off, recover, and the systems we install. Overhead Roofing is a Polyglass Premio Select Contractor (#9272). Polyglass makes modified bitumen membranes and roof coatings used on flat roofs.
Upkeep After a Flat Roof Is Coated
A coated flat roof still needs the same attention as any flat roof. The National Roofing Contractors Association advises checking roof systems at least twice a year, ideally in spring and fall, and after severe weather. In Los Angeles, the fall visit belongs before the November-to-March rainy season.
- Keep drains, scuppers, and gutters clear
- Look for punctures or scuffs where people walk or work
- Check the coating around pipes, curbs, and walls
- Recoat with silicone when the top layer wears thin
Where it applies, the 20-year manufacturer warranty is subject to the manufacturer’s warranty terms, so keep its papers and your maintenance records together. Our roof maintenance visits cover these checks.
Our Reviews
Get a Price on Coating Your Flat Roof
Send us the address, what the roof is made of if you know, its rough size, and photos of any low spots, blisters, or ceiling stains. Call (877) 557-7778 or use the form. Estimates are free, and we hold CSLB license #1119699 (C-39).
Get Your Free Estimate
Please fill out the form below, or call: (877) 557-7778
Please fill out the form below, or call:
(877) 557-7778
Need Roof Repair or Replacement? Get a Free Estimate Today!
Don’t wait until a minor issue turns into a significant expense. At Overhead Roofing CA, we make it easy to get expert service fast with no pressure and no hidden fees. From routine roof maintenance to full tear-offs and installations, our team handles every project with precision, honesty, and care.
We specialize in helping LA homeowners and business owners protect their most valuable assets with dependable roofing solutions that last. Our licensed contractors are standing by, ready to inspect your roof, answer your questions, and provide a clear action plan all at no cost to you.
Residential roof repair & replacement
Commercial roofing inspections & upgrades
Emergency leak response & storm damage repair
Financing options available for every budget
Flat Roof Silicone Coating Questions
Can silicone go over a torch-down roof?
Yes, in most cases. Modified bitumen, which includes torch-down, is one of the roof types California’s building code lists for a coating without a tear-off. The cap sheet has to be bonded and dry, loose granules are cleaned off, and blisters and open laps are repaired first. Some granulated cap sheets need a primer or base coat, as the coating maker’s data sheet specifies.
Can a TPO roof be coated with silicone?
A TPO roof that is still well attached can be coated, but TPO is a slick surface and adhesion has to be confirmed. The coating maker specifies a primer for TPO, and we coat and pull a test patch before doing the whole roof. If the membrane is shrinking, brittle, or loose, replacing it is usually the better choice.
How much standing water can a silicone coating handle?
Silicone is made for use in ponded areas, so water that sits after rain does not break it down the way it breaks down acrylic. That does not make ponding harmless. It adds weight, collects dirt, and shows the roof is not draining as the code intends, so clearing drains and fixing low spots is still part of the job.
How long does it take to coat a flat roof?
It depends on the roof’s size, the repairs needed, and the weather. Cleaning and drying come first, then repairs and detail work, then the coating, which needs dry weather to cure. A common rule is not to coat when rain is forecast within 24 hours. Your written estimate gives the expected schedule for your roof.
Will coating my flat roof fix a leak?
No. A coating seals a roof that is already sound. If water is getting in, the leak is traced and repaired, and wet insulation or decking is replaced, before the roof is cleaned and coated. If those repairs would cover a large part of the roof, we will tell you and price a replacement as well.
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