Two good options, two different bets. Here is the honest comparison rather than the one that ends with whichever product carries the better margin.
The case for silicone roof coating
Coating is the option that keeps an existing roof out of the landfill. If the substrate is sound, a silicone system buys another cycle for a fraction of a tear-off. Lifespan runs 10 to 20 years, installed cost $2.50 to $5.50 per square foot.
Silicone holds up under ponding water in a way acrylic does not, which matters on older flat roofs where the slope was never quite right to begin with.
The case for TPO membrane
TPO reflects a large share of incoming solar radiation, which on a flat commercial roof translates directly into lower cooling load through the summer. Lifespan runs 20 to 30 years, installed cost $6.00 to $11.00 per square foot.
TPO is hot-air welded, not glued. A technician runs a robotic welder along the lap and the two sheets fuse into one. That is why seam probing is part of any honest inspection.
Where each one lets you down
Coating fails when it is applied over a wet or failing substrate. It is a renewal system, not a repair system. By contrast: TPO fails at the seams when they were welded too cool, too hot, or too fast. A correct weld tears the sheet before it tears the seam.
What to specify either way
- Insist on a moisture survey before a coating quote. Coating over trapped moisture seals the water in and the problem gets more expensive, not less.
- Specify 60 mil minimum. 45 mil exists and is cheaper and you will meet it again sooner than you want to.
- A written scope that names the underlayment, not just the surface material
- A per-sheet price for deck replacement, agreed before tear-off
How we would decide
If you are staying in the house past the next fifteen years, buy the longer service life and stop thinking about it. If you are likely to sell inside five, the cheaper assembly done properly is the better use of the money. Slope, framing capacity and HOA rules narrow the choice faster than preference does.
Questions we get asked
Which one is cheaper over thirty years?
Divide installed cost by expected service life and the gap narrows sharply. The cheaper roof up front is frequently the more expensive roof per year.
Can I switch from one to the other?
Sometimes. Moving to a heavier assembly means confirming the framing can carry the load, which may require an engineer. Moving to a lighter one is usually straightforward.
Does either affect resale?
A documented, permitted roof with remaining service life affects resale. Which material it is matters far less than whether the paperwork exists.
Working with a Sunland roofer
All American Roof Repair & Commercial Roofing has been on Sunland roofs since 1986. We cover Sunland and the surrounding communities including La Crescenta, Montrose and Panorama City, and every estimate we write names the material, the underlayment and the flashing scope so you can compare it line for line against anyone else's.
If you want a second opinion on silicone roof coating vs TPO roofing, call (818) 275-0921 or run your address through our instant quote tool for a ballpark figure before you talk to anyone.
Need a roofer in Sunland?
Free inspection, honest scope, and an estimate that names the material and the flashing work. Call (818) 277-6626 or get a ballpark in about a minute.
