Crawl Space Repair in Tigard, OR

Tigard is the westside city where topography does the most work. Bull Mountain rises on the western side, while Metzger and the neighbourhoods toward Fanno Creek sit on the basin floor. Those two settings fail differently, and a scope written for one is wrong for the other.

On the slope, water moves. Groundwater travels downhill through the wet season and intersects foundations partway down, which is why the effective fix on a hillside lot starts uphill — a curtain drain intercepting flow before it reaches the house — rather than at the foundation. On the flat, water sits: the table rises under the lot, and an interior perimeter drain with a sump is the standard answer.

The city-wide soil figure sits between the two, as you would expect. USDA soil survey data clipped to the Tigard place boundary rates 41.6% of the mapped area as somewhat poorly to very poorly drained, with 3.0% unrated. Lower than Beaverton at 52.7% or Hillsboro at 61.6%, higher than Tualatin at 20.2%.

The useful conclusion is that Tigard's number should not be used to predict your lot. It is an average across two settings that behave in opposite ways, and the address matters more here than the city does.

Census American Community Survey five-year estimates for 2019 to 2023 put Tigard's median year built at 1988, with 35.5% of homes built before 1980 and 2.7% before 1950. Very little pre-war stock; a large middle cohort now in its fourth or fifth decade.

The finding that dominates in housing of that age is not dramatic and is easy to under-price rather than over-price. Original polyethylene torn or displaced; R-19 floor batt sagging out of contact with the subfloor and no longer delivering its rated value; damp perimeter insulation each winter where rim joists were never air sealed. None of that is an emergency and all of it is worth fixing, because the cost of the fix does not rise but the framing damage behind it eventually does.

Where a Tigard quote does justify the top of the published ranges, it is usually the hillside drainage component rather than the crawl space materials doing it. Curtain drain length and discharge routing are what move a number on Bull Mountain, and both should be itemised.

Two of the neighbourhoods most often filed under Tigard are census-designated places rather than parts of the city: Metzger, and Bull Mountain on the slope to the west. That is the Census Bureau's category for a settled, named community that is not incorporated, and the two sit at opposite ends of Tigard's housing profile. ACS figures for 2019 to 2023 give Metzger a median year built of 1977, with 57.6% of its homes built before 1980. Bull Mountain's median is 1995, with 16.2% before 1980 and effectively none before 1940. The city itself sits between them, at 1988 and 35.5%.

That gap changes the job before the water question is even asked. A Metzger house from the 1970s is on its original ground cover and floor insulation if it still has them, and replacing failed materials is the likely core of the quote. A Bull Mountain house from the 1990s is more likely to have both still in place and a hillside water path to deal with instead, which is where the curtain drain and its discharge route come in — the lines, as noted above, that move a Bull Mountain number.

It changes the permit desk as well. Tigard's building division issues its own building permits and the trade permits, electrical included, inside the city. An unincorporated address is not the city's to permit, and both communities lie wholly within Washington County, whose Building Services states that it covers unincorporated areas only. Whether a Metzger or Bull Mountain address is inside the city limit or outside it therefore decides which office issues the permit for a sump pump circuit, and the quote should say which.

Six NOAA stations with published 1991–2020 precipitation normals sit within fifteen miles of Tigard, and the highest and lowest differ by 8.29 inches of annual normal rainfall. The nearest is 8.0 miles away, among the further distances on this site.

That is why no page here quotes a rainfall total for any city. Precipitation is a point measurement taken at an instrument, and instruments are not sited to represent municipal boundaries. A figure captioned as Tigard's annual rainfall would be some station's reading with a city's name attached to it.

The reason to care rather than treat it as a footnote is that rainfall totals get used to justify scopes. If a quote or a piece of marketing leans on a city-specific rainfall number, ask which station produced it and how far away that station is. For a city split between a hillside and a valley floor, the answer may be less relevant to your lot than the eight-mile distance already suggests.

Fanno Creek runs through the eastern side of Tigard and is studied in detail in the FEMA Flood Insurance Study for Washington County. Its largest observed flood was February 1996, at roughly a 25-year return interval — modest as return intervals go, and a reminder that the creek's flood behaviour is a different question from Bull Mountain's hillside seepage. Two water problems, two catchments, one city.

The same study records that damaging floods in this county fall between late October and April, and are most severe from December through February. That is precisely the stretch when a crawl space here sits closest to the dew point for weeks at a time, which is why the wet season produces both kinds of complaint at once and why the diagnosis matters more than the season does.

On permits, Tigard's building division issues residential building permits and also reviews and issues the trade permits itself — plumbing, electrical, mechanical, fire protection and solar. Neighbouring Sherwood does not: electrical there is permitted and inspected by Washington County. Since a sump pump needs an electrical permit and Bull Mountain scopes frequently include one, that difference is worth confirming rather than assuming from a contractor's habit.