San Dimas, CA
Flat and low-slope roofing in San Dimas
Almost every flat roof problem is a drainage problem wearing a disguise. Standing water finds the one seam that was not welded properly.
Or call (909) 752-8498Describe the flat roofing job
Three questions, then the address. Up to three San Dimas contractors who do this work.
Your request is in.
We are matching it now against roofing contractors working in San Dimas and the surrounding area.
- Today, usually within the hour. The first contractor calls or texts the number you gave us. ASAP requests go out first.
- Up to three of them, no more. We cap it at three so you can compare without your phone melting.
- They come and look. Estimates are given after somebody has been on the roof, not over the phone.
- You decide, or you do not. There is nothing to cancel and nothing to pay us.
If you do not hear anything today, check your voicemail and spam folder — contractors often call from a mobile number.
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.
- How the flat section is flashed into adjoining walls and pitched roofs
- Drain, scupper and overflow provision
- Whether a coating is being sold as a repair
- 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.
Modified bitumen is the rolled, torched or self-adhered system you see on older flat additions. Cheaper, and shorter-lived.
Locally
The second problem is the marine layer keeping the north slope damp. Damp that arrives every morning and leaves by lunchtime is worse for a roof than rain, because nothing ever fully dries between one and the next.
About flat roofing here
Why does ventilation keep coming up?
Because a badly ventilated attic cooks the roof from underneath and takes years off it. Intake at the eaves and exhaust at the ridge, in balance. It is cheap during a re-roof and awkward afterwards.
Do you handle commercial buildings?
Yes. Commercial requests go to contractors who do low-slope and flat systems rather than to residential crews. Say so on the property question and it routes correctly.
What if the decking is rotten underneath?
Some of it usually is. The important thing is that the price per sheet is agreed in writing before the tear-off, so the conversation on day two is about quantity rather than rate.
What should I do to prepare?
Move the cars out, take pictures off the top-floor walls, cover anything stored in the attic, and put pets somewhere else for the loud days. Expect nails in the driveway however careful the crew is — ask whether they run a magnet at the end.
Start with a free estimate
Three questions, about a minute, and up to three San Dimas contractors come back to you.