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Chronic paint failure on original wood siding from Gorge wind-driven rain cycling: Gresham's position at the Gorge mouth creates a specific siding failure mechanism that interior Portland neighborhoods don't face to the same degree: wind-driven rain events from the east that drive moisture directly into wood siding face grain rather than running down it vertically as standard rainfall does. Standard lap siding profiles designed to shed vertical rain are less effective against this lateral wind-driven moisture — which enters butt joints, nail penetrations, and any location where paint adhesion has begun to fail. Each Gorge wind event with rain deposits moisture deeper into the wood fibers on east-facing elevations. The paint failure that results isn't cosmetic; it's a symptom of wood substrate that has been progressively saturated across decades of Gorge exposure. Repainting provides a maintenance interval, not a resolution. James Hardie fiber cement doesn't absorb that wind-driven moisture at all. Oregon CCB License 217914.
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T1-11 and hardboard siding from the 1970s–1980s delaminating at edges and joints: Gresham's suburban build-out through the 1970s and 1980s used T1-11 plywood siding and hardboard composite products extensively — both on detached garages and accessory structures and on primary residential structures. These materials absorb moisture at exposed bottom edges and vertical seams, swell as they saturate, and delaminate progressively from the edges inward. The delamination pattern is typically visible as raised, bubbled, or detached surface layers at the bottom of each panel run and along vertical seams where water has consistently pooled or been driven. Once delamination begins on T1-11 or hardboard, repair of individual sections is a short-term measure — the remaining panels at the same elevation have typically absorbed similar moisture loads and are at the same point in the failure sequence.
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Vinyl siding warping and loosening on 1980s–1990s Gresham homes from Gorge thermal cycling: Gresham's Gorge mouth position creates the widest summer temperature swings in Multnomah County — cold east-wind events in winter and spring, followed by summer dry-heat events when Gorge outflow delivers dry continental air into the valley. Vinyl siding absorbs and releases heat differently than the sheathing behind it, and the thermal expansion differential between vinyl profiles and their substrate attachment points produces warping, bowing, and loosening at laps on east-facing and south-facing Gresham elevations over 25–35 years. The loose laps that result aren't just cosmetic — they're moisture infiltration points during the next Gorge wind-rain event.
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Hidden rot behind older Gresham siding from decades of un-managed moisture intrusion: Gresham's 1960s and 1970s homes were built without weather-resistant barriers behind the exterior cladding — original wood siding was installed directly against the building paper or felt that served as the era's nominal moisture control layer, with no drainage gap and no integration with modern flashing standards. Decades of Gorge-amplified wind-driven rain have worked moisture through every paint crack, nail head, and butt joint into the building paper and into the structural framing behind. When we remove siding on these homes, we regularly find felted paper that has disintegrated, sheathing boards with significant surface rot, and occasionally compromised framing members. Full substrate assessment at removal — before new product is installed — is the only way to know what you're working with and to warrant the new installation appropriately. Oregon CCB License 217914.
What James Hardie Delivers for Gresham Homeowners
Fiber cement is the only common exterior cladding material that is genuinely impervious to moisture — it doesn't absorb the Gorge wind-driven rain that has been destroying painted wood on Gresham's east-facing elevations for decades. James Hardie HardiePlank with ColorPlus Technology carries a 30-year product warranty and 15-year factory-applied finish warranty. ColorPlus finishes are kiln-baked at the factory, not field-applied — which means they maintain adhesion under the Gorge wind-driven rain conditions that destroy field-applied paint on wood in 5–8 year cycles in Gresham's eastern elevations.
As a James Hardie Preferred Remodeler, Left Coast Exteriors installs with enhanced warranty coverage unavailable to standard-certified contractors. Every Gresham project begins with full removal to expose and assess the sheathing and moisture control layer. On Gresham's 1960s–1970s homes, full substrate assessment isn't optional — it's a prerequisite for installing and warranting fiber cement correctly. Oregon CCB License 217914.
James Hardie Preferred Remodeler