How do roofers work around storms?
They watch the forecast and schedule tear-off for a run of dry days, start with the sections they can finish fastest, and stop tear-off early if rain moves in. The NWS Bay Area forecast is the usual starting point.
What is "dry-in," and why does it matter?
Dry-in means covering the exposed roof deck with underlayment (and flashing at edges and penetrations) so the house is protected even before the final roofing goes on. A roofer who dries in each section the day it's opened greatly reduces the risk of a mid-job leak.
When is tarping used?
Tarps cover areas that can't be dried in before rain, such as a section where rotten decking must be replaced. Tarping a steep, wet roof is dangerous work for a crew, not a homeowner.
What should the contract say for winter work?
- How much roof will be opened at a time
- How the crew will protect the house if rain arrives
- Who is responsible for interior damage during the job
- How rotten decking will be priced (per sheet) and how it affects timing
- That the permit is pulled and inspections are scheduled (permits)
How wet has the season been so far?
| NWS station | Rain since July 1 | Normal to date | Percent of normal |
|---|---|---|---|
| San Francisco Downtown | 0.42 in. | 1.98 in. | 21% |
| San Francisco Airport | 0.45 in. | 1.39 in. | 32% |
| Oakland | 0.73 in. | 1.51 in. | 48% |
| Hayward | 0.75 in. | 1.39 in. | 54% |
| Concord | 0.58 in. | 1.22 in. | 48% |
| Livermore | 0.47 in. | 1.38 in. | 34% |
| San Jose | 0.27 in. | 0.99 in. | 27% |
Source: NWS San Francisco Bay Area, Area Precipitation Information product, issued 2:15 AM PST November 11, 2026 (preliminary data as of midnight).
What's different about the Bay Area?
A Bay Area storm does not treat every roof the same way. In Marin and the Oakland and Berkeley hills, trees drop litter and limbs into valleys and gutters, and steep streets make emergency tarping harder. In San Francisco and along the Peninsula coast, wind and salt air test flashing, fasteners and flat-roof drains. In the South Bay and inland East Bay, shingles that have baked through hot summers are more likely to crack, lift or blow off when the first strong wind and rain arrive.
Frequently asked questions
Is it OK to replace a roof in winter in the Bay Area?
Yes, with planning. Roofers work between storms, open one section at a time and dry it in the same day.
What is roof dry-in?
Covering the exposed deck with underlayment and edge flashing so the house is protected before the final roofing goes on.
Who pays if rain gets in during a reroof?
That depends on the contract. Ask before signing and put responsibility for interior damage in writing.
Does rain delay the permit inspection?
It can delay the work that needs inspecting. Ask your roofer to schedule inspections around the weather.
Sources
- NWS Bay Area: area precipitation product (Nov 11, 2026)
- NWS San Francisco Bay Area forecast office
- CSLB: finding the right contractor
- 2025 California Residential Code, Section R908 (reroofing)
Sources reviewed November 11, 2026. Figures are published estimates and official fees, not quotes. Confirm prices, permits and requirements with your contractor and building department. This page is general information, not legal or insurance advice.