Cornerstone Roof ProsStorm damage, leaks, full replacements — handled locally.(626) 990-2952Free estimate

West Covina, CA

Flat roof work in West Covina, CA

Flat sections on an otherwise pitched house are where the leaks are. Additions, porch roofs, and the bit over the garage.

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Describe the flat roofing job

Three questions, then the address. Up to three West Covina contractors who do this work.

Or call (626) 990-2952

Free · Takes about a minute

Describe the flat roofing job

Three questions, then the address. Up to three West Covina contractors who do this work.

Step 1 of 6

What best describes your home?

Different buildings need different crews, so this is the first thing a roofer asks.

No cost to you. Contractors pay us, you do not.

Before you let anybody on the roof

The things worth pinning down on a flat roofing job. A contractor who has not raised them has not looked properly.

  • Whether a coating is being sold as a repair
  • Drain, scupper and overflow provision
  • How the flat section is flashed into adjoining walls and pitched roofs
  • Whether water ponds anywhere after rain
  • Which membrane, and how the seams are joined

Ponding water is the enemy. Anything still sitting there forty-eight hours after rain is a design problem, and tapered insulation is usually the answer.

Drains and scuppers need to be checked every season. One blocked drain can hold enough water to matter structurally.

Single-ply membranes — TPO, PVC, EPDM — are heat-welded or taped at the seams. The seams and the terminations are the whole job.

Locally

Behind it: wind-blown embers landing in the valleys. Class A assemblies and closed-off vents matter more here than the colour of the shingle.

About flat roofing here

How long does a re-roof take?

Two days is typical for asphalt. Add days for steep pitch, multiple layers to strip, tile work, or a roof with a lot of valleys and penetrations.

Are gutters included in a re-roof?

Usually not, unless the quote says so. If they are near the end of their life, replacing them during the re-roof is meaningfully cheaper than doing it later, because the crew and the staging are already there.

What if the decking is rotten underneath?

Expect a few sheets on most older roofs. Get the per-sheet rate in the contract. Open-ended decking charges are where a fixed price stops being fixed.

I have solar panels. What happens to them?

They come off and go back on, and that is a separate cost, often handled by the solar installer rather than the roofer. If the roof is near the end of its life, do the roof first — removing and refitting panels twice is money wasted.

Start with a free estimate

No cost, no obligation, and never more than three contractors.

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