Metal chimneys in Gresham homes built near Mt. Hood Community College and in Rockwood often show accelerated corrosion along seams and flashing because of repeated saturation during wet winters. Standing water from poor drainage around foundations in these neighborhoods seeps into chase areas and attacks the outer skin and inner liner. Technicians must remove sections of siding or roofing to reach the damage without disturbing the surrounding brick or stucco that is common on 1960s and 1970s houses in Downtown Gresham.
Portland’s mild summers give a short window for exterior work before the next rain cycle begins, so repairs focus on replacing only the compromised lengths rather than full liner pulls when possible. Crews check for pinhole leaks at elbows and confirm proper slope on any new sections to keep condensate from pooling again. Access on sloped lots common along the edges of Rockwood requires extra staging that changes the time needed compared with flat lots near Gresham Pioneer Cemetery.
Code compliance in Multnomah County requires maintaining the original UL listing on replacement parts and ensuring the metal gauge matches the appliance input. Skipping this step can void homeowner insurance after a flue failure. DraftSafe Masonry keeps replacement stock on the truck so a single visit can finish most jobs before the next storm front moves in from Portland.
Technician insight
In Gresham, the thing that catches most people out with metal chimney repair is how wet winters and occasional flooding push water up under the flashing on older liners in Rockwood homes. Homeowners often notice stains only after the liner has already perforated in several places, turning a small patch into a multi-section replacement once we open it up.
Downtown Gresham Metal Liner Leak
Water stains appeared on the ceiling after heavy winter rain. Inspection showed rust holes at two elbows on the metal chimney serving a 1970s home near Gresham Pioneer Cemetery. Crew replaced the affected lengths with new liner, resealed the flashing, and ran a smoke test. No further leaks occurred through the following wet season.
How it works
- 1
Initial Assessment
Technician climbs the roof and inspects the full length of the metal chimney for rust, loose seams, and water intrusion points.
- 2
Moisture Mapping
Interior and exterior surfaces are checked for active leaks, especially around flashing where flooding runoff collects in Rockwood.
- 3
Section Replacement
Damaged lengths of liner or outer shell are cut out and new UL-listed metal is fitted with proper overlaps and sealants rated for wet climate exposure.
- 4
Final Testing
A smoke test confirms draft integrity and verifies no new pathways for water entry before the crew leaves the site.
Pricing
Pricing varies by chimney height, number of damaged sections, and roof access difficulty on sloped Gresham lots.