Cool Roof Savings on a Southern California Warehouse in the Westside
How to read an estimate for a TPO roof in West LA, and what to walk away from.
Choosing a roofer is mostly a matter of reading estimates properly, which nobody teaches. For a TPO roof in the Westside, this is what to compare and what to ignore.
What actually matters
Membrane thickness, insulation build-up and the number of penetrations to detail around set the price. Sixty mil rather than forty-five is a small percentage on the quote and a large difference in puncture resistance.
The detail that is usually left out
Read the exclusions before the total. The cheapest quote and the best quote are occasionally the same document, and the exclusions are how you tell. Weld testing is the item to insist on. A probe run along every seam while the crew is still on site costs nothing and finds the cold welds that would otherwise be discovered by a tenant in December. Ask how it will be handled in writing, and the rest of the job tends to go the same way.
What is specific to the Westside
The marine layer decides most of what happens here. Roofs sit damp until late morning for a good part of the year, dry out in the afternoon, and do it again the next day. That cycle is gentle on the material and hard on anything organic: north-facing slopes hold moss and algae, and shaded valleys stay wet long enough to rot a felt underlayment that would have been fine two miles inland. There is a wide spread of stock, from 1920s Spanish with original clay through to flat-roofed modern rebuilds, and the two need completely different attention.
What we look at before quoting
- Seam integrity, probed along the full length rather than spot-checked
- Punctures and abrasion, especially on traffic routes to rooftop plant
- Membrane shrinkage and any resulting tension at the perimeter
- Flashing and termination bar at every wall, curb and upstand
- Drain sumps and clamping rings, checked and clear
- Fastener plates showing through the membrane surface
- Weathering and chalking of the surface, particularly on exposed elevations
Common questions
Is a deposit normal?
A reasonable one is. What is not normal is a large payment before materials are on site, and California limits what can be asked for up front.
How many quotes should I get?
Three is plenty. More than that and you tend to be comparing sales technique rather than scope.
The honest summary
TPO is a good system installed properly and an expensive mistake installed quickly. Seams and punctures decide its life, so protect the surface and test the welds. In the Westside the thing to watch is north slopes, shaded valleys and anywhere the morning damp does not clear by noon.
Free inspection, drone photography where access is difficult, and a written estimate with deck repair priced per sheet. No obligation.
More on TPO Roofing
- Cool Roof Savings on a Pasadena Warehouse in the foothill communities (Part 3)TPO Roofing
- Cool Roof Savings on the Westside Warehouse in the WestsideTPO Roofing
- Sixty Mil or Eighty: Choosing TPO Thickness — Homeowner ChecklistTPO Roofing
- How Long Does TPO Last in Long Beach? — The Short AnswerTPO Roofing