Flat and low-slope roofs in San Diego.
Flat roofs aren't actually flat — they're low-slope, and they live or die on drainage and seam quality. Mid-century modern homes throughout San Diego have flat sections. We install TPO (the modern standard), modified bitumen (still viable for some use cases), and PVC (premium, chemical-resistant). Proper slope toward drains or scuppers is non-negotiable.
What's included in this service?
- TPO (thermoplastic polyolefin) — the modern standard, 15–25 year lifespan
- Modified bitumen (hot-mopped or torch-applied) — traditional flat roof
- PVC — premium, chemical-resistant, good for commercial kitchen exhaust areas
- Built-up roofing (BUR) — rare now, still viable on some historic flat roofs
- Coating systems — silicone and acrylic over existing BUR for life extension
- Scupper, drain, and overflow drain installation per code
- Parapet wall flashing and counter-flashing
- Internal drain systems for deck-over-living-space situations
When do you need this service?
- Mid-century modern home with a flat or low-slope section
- Commercial building with a flat roof past end-of-life
- Addition or accessory dwelling with a low-slope roof
- Existing flat roof has bubbling, ponding, or open seams
- Interior ceiling staining from a flat section of roof
- Flat roof is 18+ years old (typical TPO life)
What do homeowners ask about Flat Roofs?
How long does a TPO roof last?
Properly installed TPO lasts 15–25 years in San Diego. UV and thermal cycling are the main aging factors. White (reflective) TPO lasts longer than colored. Proper drainage is the single biggest factor — ponding water cuts TPO life in half.
Why does my flat roof have ponding water?
Two reasons usually: incorrect slope at install (code requires 1/4 inch per foot minimum toward drains), or deck sag from age and weight. Ponding accelerates membrane breakdown and is a code issue. We assess during inspection and correct slope with tapered insulation during replacement.
What is the difference between TPO, PVC, and EPDM?
TPO is the modern residential/light-commercial standard — reflective white, heat-welded seams, 15–25 year life. PVC is similar but more chemical-resistant — better for kitchen exhaust areas or industrial. EPDM (rubber) is older tech, black, glued seams — cheaper but harder to repair and shorter life.
Can I put a deck or solar on a flat roof?
Yes, both. Solar mounts attach via non-penetrating ballasted systems or proper flashed penetrations. Decks need structural review — most residential flat roofs aren't rated for live load. We coordinate with a structural engineer when needed.
What about silicone coating instead of replacement?
Silicone roof coatings can extend a flat roof's life by 10–15 years when the existing membrane is structurally sound but weathered. Cost is 30–50% of replacement. Not an option if there's ponding, membrane failure, or deck issues underneath.
Where do we offer Flat Roofs in San Diego County?
We provide flat roofs in every city and community in San Diego County. Pick your city for local climate notes and service specifics.
See flat roofs in all 47 cities
Homeowners who hired us for this
Our 1990s Spanish tile roof was leaking in three spots. Instead of a full tear-off, Top Pro did a lift-and-relay with new underlayment and salvaged 90% of the original tiles. Crew was meticulous. Passed inspection on the first visit.
Got four quotes for a full tear-off and reroof. Top Pro was the only company that actually pulled up into the attic to check for rot before quoting. Found damage the others missed. Fair price. Crew was on time every day.
Live three blocks from the ocean. Salt killed our old shingle roof in 12 years. Top Pro installed stone-coated steel with stainless fasteners. Clean lines, clean job site, and they coordinated the HOA design review paperwork.
Need flat roofs in San Diego County?
Call for a free quote. Most work scheduled within the week.