Happy Valley sits in a damp pocket of south Bellingham, tucked between the forested slope of Sehome Hill and the wetlands along Connelly Creek. The neighborhood's mix of early-1900s cottages and 1960s and 70s rentals near Western Washington University takes a beating from two directions: steady Pacific Northwest rain overhead, and ground moisture rising off the creek corridor below. Siding here does not fail the way it does in drier climates. It fails quietly, from the back side out.
Why Siding Wears Out Faster on Bellingham's South Side
North-facing walls in Happy Valley rarely dry out between October and May. The Sehome Hill greenbelt throws long shade over streets like 21st and Donovan, and that shade is exactly where moss, algae, and cupped cedar boards show up first. On the older homes near the Interurban Trail, we often find original bevel siding nailed straight to the studs with no weather barrier at all, a common practice when these cottages were built.
The 60s and 70s era houses have their own pattern: T1-11 and early hardboard panels that soak up water at the bottom edge, swell, and let rot creep up behind the paint. Alpine Exteriors has spent 25 years opening up walls exactly like these, so we know the difference between siding that needs paint and siding that is hiding a sheathing problem.