Crawl Space Repair in Camas, WA

Camas carries a real pre-war core, and the headline statistic hides it completely. Census American Community Survey five-year estimates for 2019 to 2023 put the median year built at 1999 — and 14.3% of the housing stock before 1950. About one Camas home in seven predates 1950 and one in ten was built in 1939 or earlier — the highest pre-1950 share of the four Washington cities, ahead of Washougal at 11.7%, Vancouver at 9.7% and Battle Ground at 3.1%.

That is the mill-era downtown core against two decades of hillside subdivision, averaging out to a median that describes neither. The mill houses have the pre-war crawl space profile: no ground cover from the original build, low clearance, framing that has been over open soil for the better part of a century. The Prune Hill and Lacamas Heights builds have the modern one: everything present from new, and now twenty to twenty-five years into its service life.

Practically, ask which Camas your house is in before you compare quotes, because the two ends of this town do not share a scope and should not share a price.

Camas has the driest measured ground of the four Washington cities. USDA soil survey data clipped to the Camas place boundary rates 11.7% of the mapped area as somewhat poorly to very poorly drained. A large 17.8% carries no drainage class at all — the second-highest unrated share on this site — which is mostly Urban land map units and water, Lacamas Lake included.

So the rated ground drains well, and yet the dominant scope on Prune Hill and Lacamas Heights is drainage. That is not a contradiction, it is the difference between two questions. Drainage class describes the natural soil in place; it does not describe a steep lot where the hillside above is routing winter runoff past your foundation. Water arriving from uphill is indifferent to how well the soil beneath it drains.

The characteristic Camas answer is therefore an interception one: a curtain drain uphill of the house, taking the flow before it reaches the foundation, with interior perimeter drainage and a sump behind it. On steep lots the drain length and the discharge routing are what move the number, and both belong on the quote as separate lines rather than inside a lump sum.

Camas homeowners who have read Oregon-focused advice often arrive believing a sealed crawl space is barely available. On this side of the river it is more available, not less. WAC 51-51-0408 permits an unvented crawl space either with a sealed Class I vapor retarder extending six inches up the stem walls together with a radon system, or with continuously operated mechanical exhaust at 1 cfm per 50 square feet.

Oregon, by contrast, does not permit unvented crawl spaces in new construction in the counties where radon-mitigating construction is required, and asks for twelve inches up the stem wall rather than six. A row-by-row comparison of the two codes covers the rest of the differences.

The condition to hold a contractor to is the radon system. Washington also requires an Appendix AF radon vent system where ventilation is taken below the 1/300 ratio or operable louvers are fitted. If a Camas quote proposes sealing or materially reducing ventilation and contains no radon provision, that is not a cheaper version of the same job; it is an incomplete one.

The sealing option described above comes with a requirement that is easy to leave off a quote, and in Camas it is not a formality. Clark County sits in Zone 1 of the EPA Map of Radon Zones, the highest category, meaning a predicted average indoor screening level above 4 pCi/L. Washington requires an Appendix AF radon vent system wherever crawl space ventilation is reduced below the 1 in 300 ratio or operable louvers are used, and the county's zone is the reason that clause exists rather than a technicality to be negotiated away.

EPA's own instruction is that the zone map must never be used to decide whether a particular house needs testing, and that every home should be tested whatever its county. On a hillside Camas house about to be sealed, that means a test before the work and another after it.

On water, Lacamas Creek is among the flooding sources studied in detail in the FEMA Flood Insurance Study for Clark County, alongside the Columbia. Given how much of Camas sits above the creek and the lake rather than beside them, the flood question here separates sharply by address in a way the hillside drainage question does not — and it is answered by the FIRM panel and the city floodplain administrator rather than by a contractor's estimate.