Crawl Space Repair in Aloha, OR

Aloha has a distinction none of the other eighteen service areas share: 0.0% of its mapped area carries no drainage rating. Everywhere else, some share of the city — half of Portland, a sixth of Camas, an eighth of Milwaukie — falls into Urban land map units or water, which the soil survey does not assign a drainage class to. In Aloha, the survey has an answer for effectively every acre.

That answer is 49.6% somewhat poorly to very poorly drained. Just under half the ground holds water through the wet season, and unlike most of this metro that figure is not hedged by an unmapped remainder that might be worse or might be better.

The reason it matters is that the soil survey is normally least informative under exactly the dense older housing where crawl space problems concentrate, because that is where the Urban land units are. In Aloha you get a clean read. So if a contractor tells you the ground under an Aloha house is fine, that is a claim the published data can actually be checked against.

Aloha is not a city. It is an unincorporated community in Washington County, and that has consequences a homeowner meets at the permit counter rather than in the crawl space. There is no Aloha building department; the county is the authority for the area.

The two practical questions worth asking before work starts are which permits the quoted scope requires and who issues each one, because contractors who mostly work inside Beaverton or Hillsboro city limits do not necessarily have the county process at their fingertips. A sump pump needs an electrical permit; a barrier replacement generally does not.

Aloha does keep one thing the incorporated places do not always: because the Census designates it as a place, it has its own ACS estimates and its own soil clip, which is why this page can carry figures at all. Clackamas, also unincorporated, has no place boundary and therefore no figures — the two unincorporated communities on this site are in genuinely different positions.

The Census puts Aloha's median year built at 1983, with 46.4% of homes built before 1980 and 2.7% before 1950. Nearly half the housing predates 1980, which is a higher share than Beaverton, Tigard, Hillsboro or Wilsonville carry.

Combined with the drainage figure, that produces a specific and common combination: original vapor barrier long past its life, on ground that is wet for months, under floor batt that has been damp repeatedly. Insulation in that state is not merely underperforming, it is habitat. Rodent damage to floor insulation is one of the more frequent findings in this housing cohort.

Which matters to the scope for a reason that is easy to miss on a quote. Insulation contaminated by rodent activity is handled and disposed of differently from clean material, and the exclusion work that stops it recurring is a separate trade from the crawl space work. A bid that removes contaminated batt without addressing the entry points has bought you a repeat.

The consequence of being unincorporated turns out to be sharper than it first appears. Washington County Building Services states that its guidance applies to locations within unincorporated Washington County, and directs anyone inside a city to that city instead. Aloha is not a city, so the county is the permit authority for it — and, on the same statement, is not the authority for Beaverton, Hillsboro or Tigard next door, each of which issues its own permits including electrical.

So a contractor's experience three miles away does not transfer. That matters most on the one crawl space item that reliably needs an electrical permit, which is a sump pump circuit. Ask who is pulling which permit before work starts rather than after.

Being unincorporated also puts Aloha inside the FEMA Flood Insurance Study for Washington County under the unincorporated-areas heading rather than as a named city. That study records February 1996 as the largest recorded flow on the Tualatin River, at an 84-year return interval, and notes that damaging floods in this county fall between late October and April and are most severe from December through February. Whether any particular Aloha address is affected is a FIRM panel question, not one this page can answer.