Pomona Roof Pros provides professional chimney flashing & reduction in Pomona, CA for residential and commercial properties across the Pomona Valley. A chimney is the single likeliest leak on an older Pomona house, and on a great many of them it is also a chimney nobody has lit in twenty years. That combination changes the right answer. Nobody enjoys hearing it and it saves money.
The leak is almost never the brick. It is the flashing, and specifically the fact that most chimneys around here have tar or roof cement smeared where two-piece flashing should be. Counterflashing has to be let into a mortar joint and turned down over a base flashing woven into the courses. Sealant run across the top of a step flashing is a two-year fix repeated forever. We see the same chimneys resealed by three different companies.
So when we open the detail we do it properly. Step flashing woven course by course up both sides, a base apron at the front, a cricket behind any chimney wider than about thirty inches so water is diverted rather than dammed, and counterflashing cut into a raked joint and sealed with polyurethane instead of plastic cement. Cricket framing is sheet metal over solid decking, not a bent pan on its own.
The other answer is reduction. If the fireplace has not been used in years, the crown is cracked, and the stack is unreinforced masonry above the roof line, taking it down below the deck, framing over and roofing across removes the leak, removes a seismic liability, and costs less than a proper reflash plus a crown rebuild plus the next repair. We raise this at least as often as we quote flashing.
Where a chimney stays, we look at the whole assembly rather than only the flashing. Crown condition, the mortar joints in the top three courses, whether the spark arrestor is holding water, and whether an earlier repair has bridged the counterflashing so water now runs behind it. That one is common, and it is why a reflash sometimes has to be undone before it can be redone.
We do not do masonry rebuilds and we do not touch internal flue work. We say so and hand it off. What we do is the roof-to-chimney interface, which is where the water is actually getting in and where most of the money has already been wasted. We can recommend the masons we work behind.
Our licensed and insured team brings the right materials and equipment to every job — architectural laminated shingles with six-nail fastening, SBS polymer-modified asphalt shingles, 1x6 spaced sheathing overlaid with half-inch plywood, two-ply modified bitumen with a granulated cap sheet, salvaged mission and S-profile clay barrel tile, 24-gauge standing seam with concealed sliding clips — and backs the work with a written workmanship warranty. We serve Pomona and nearby communities including Claremont, La Verne, San Dimas, Diamond Bar.
What We Handle
Everything our chimney flashing & reduction in Pomona covers
One crew, one point of contact, and the full range of chimney flashing & reduction work in Pomona, CA. If it is on this list we do it in house rather than handing it to a subcontractor:
- chimney flashing repair Pomona
- chimney leak repair
- step and counterflashing
- chimney cricket
- counterflashing mortar joint
- chimney crown crack
- unused chimney removal
- chimney reduction below roofline
- masonry chimney leak
- chimney saddle flashing
- chase cover replacement
Not sure which one describes your situation? Describe it in plain words and we will sort it out — or browse the rest of our Pomona services.
Materials, equipment and how we do chimney flashing & reduction
The difference between chimney flashing & reduction that lasts and chimney flashing & reduction that gets redone in three years is almost always preparation and materials, not the finish you see on day one. We work with architectural laminated shingles with six-nail fastening, SBS polymer-modified asphalt shingles, 1x6 spaced sheathing overlaid with half-inch plywood, two-ply modified bitumen with a granulated cap sheet, spec them to the job instead of to the invoice, and write the material grades into the free estimate so you know exactly what you are buying.
Every Pomona job runs the same way: site walk and measurements, written scope and fixed price, protection of the surrounding area, then the work itself with a daily clean-up. Years of roofing work in the Pomona Valley means we have already met whatever your property is going to throw at us — awkward access, older construction, an HOA with opinions.
Where we do chimney flashing & reduction outside Pomona
Pomona Roof Pros covers Pomona and the surrounding communities of the Pomona Valley. Crews run out to the same nearby cities every week, so an out-of-town job does not mean an out-of-town price.
- Chimney Flashing & Reduction in Claremont, CA — Los Angeles County, population 37,266
- Chimney Flashing & Reduction in La Verne, CA — Los Angeles County, population 31,334
- Chimney Flashing & Reduction in San Dimas, CA — Los Angeles County, population 34,924
- Chimney Flashing & Reduction in Diamond Bar, CA — Los Angeles County, population 55,072
- Chimney Flashing & Reduction in Walnut, CA — Los Angeles County, population 28,430
- Chimney Flashing & Reduction in Covina, CA — Los Angeles County, population 51,268
Start on the Pomona Roof Pros homepage for a free estimate, or call (844) 511-2320 and describe the job.
Why Pomona Chooses Pomona Roof Pros
- ✓Every slope gets its own remaining-life number in years, so you can decide what to fund and when.
- ✓We count layers and probe the deck before quoting, because a hidden third layer changes the entire price.
- ✓We argue against work. Coating aged shingles and reflashing a disused chimney both get talked out of here.
- ✓Staged reroofing across separate planes with their own drainage, never a vertical lap down one slope.
The standards behind chimney flashing & reduction
Quality here is not a matter of opinion — it is written down. The chimney flashing & reduction work we do in Pomona follows published industry standards: NRCA publishes the Roofing Manual, the industry's reference for details and slope minimums, and Asphalt Roofing Manufacturers Association sets the shingle application and ventilation guidance the warranties reference. If a contractor cannot tell you which standard a detail comes from, that is worth asking about before you sign.
Every chimney flashing & reduction project in Pomona gets the same attention, whether it is a single room or a full commercial job. We show up on schedule, keep the site clean, and stand behind the work — the estimate is free and there is no pressure.
Ready to get started? Call (844) 511-2320 for a free chimney flashing & reduction free estimate in Pomona, or request a quote and we'll get right back to you.