Water and Rot Damage Assessment in Gresham, OR
Crawl space moisture in Gresham arrives from a different direction than it does on Portland's slopes. East county ground is flatter, so water does not run off — it sits, and the seasonal water table can come up close to or above the crawl space floor. The moisture source is below rather than around.
That changes the remedy in a way worth being clear about. Grading and downspout extensions, which handle most crawl space moisture on a sloped lot, do comparatively little when the water is rising from beneath. What works here is interior drainage and a sump — moving water that has already arrived rather than preventing arrival.
It also changes where the damage is. Rising water reaches the lowest structural elements first, so decay concentrates at post bases and at the bottom of any pier or pad, while sill plates higher on the wall may be untouched. A crawl space can have significant structural decay at the bottom and look entirely sound at the perimeter, which is where people look.
What We Look At Here
- Evidence of seasonal high water: staining lines on posts and piers, silt deposits, debris marks
- Post bases and pier bottoms, where rising water does its damage first
- Whether the perimeter sill is sound, since it can be while lower elements are not
- Existing sump and interior drainage, and whether capacity matches the condition
- Ground vapour barrier condition, and whether it is holding water in or out
- Girder and joist condition above the affected posts
More on the service itself: Water & Rot Damage Assessment. More on the area: Gresham.
Questions
Frequently Asked Questions
Water sits in my Gresham crawl space every winter. Is grading the fix?
Usually not on its own. On flat east county lots the water is often the seasonal table rising from below rather than surface runoff, and that calls for interior drainage and a sump rather than exterior grading.