Salem crawlspace water damage

Salem gets around 40 inches of precipitation a year, and most of it falls between October and April. Through those months the soil around foundations rarely dries. Water seeps through foundation walls and rises into low spots, and downspouts that discharge beside the house, which is common on older ranch homes, pour roof water straight toward the crawlspace.

Some parts of the mid-valley have heavy, slow-draining soils. On those lots water sits on the surface and against foundations after a storm rather than soaking away, and crawlspaces stay damp well into spring. Homes on lower ground near Mill Creek, Pringle Creek and the city's other streams can see more groundwater still.

Plumbing adds the rest. Supply lines under the floor freeze in the occasional valley cold snap, and a leak from a bathroom or water heater above runs through the subfloor onto the vapor barrier. See our general crawlspace water damage page for how crawlspaces work.

Much of east and north Salem was built in the decades after World War II, with single-story ranch houses over vented crawlspaces. South Salem, West Salem in Polk County and the edges of the city added newer subdivisions with the same basic construction. Fiberglass batts between the joists and a plastic barrier on the soil are typical. The setup works when it stays dry and hides water when it does not.

Woodburn, north of Salem and also covered, has flat farmland terrain where water drains slowly, plus manufactured home communities whose underfloor spaces face similar problems.

A crawlspace in January is cold and damp, so it dries slowly. Contractors often choose desiccant dehumidifiers there because they keep working in cool air, and they may temporarily close the access and, where appropriate, the vents so the unit works on a contained space. Readings are taken on joists and the underside of the subfloor until they match dry wood.

Expect the crawlspace to take longer than the rooms above. Reinstalling insulation before the wood is dry is a common cause of hidden mold. Our Salem area page covers the city's broader water damage picture.

Look the contractor up on the Construction Contractors Board's online search, run from the board's Salem offices, before any work starts.

A sudden pipe burst under the floor is commonly covered by homeowners policies; groundwater seepage and long-term moisture commonly are not. The Oregon Division of Financial Regulation, also based in Salem, takes questions about insurers.

Manufactured home communities around Salem and Woodburn have their own kind of underfloor space: plumbing and ducts run beneath the floor, held in by a fabric belly wrap and hidden behind skirting. A frozen or failed supply line soaks the insulation and wrap, and the first sign is often a soft floor or a sagging wrap visible behind the skirt. Drying means opening the wrap, removing wet insulation and drying from below before it is closed again.

Many Salem crawlspace homes run furnace ducts under the floor. Water that drips onto ducts or collects inside them can push damp, musty air through the house when the furnace runs. After a crawlspace flood, have the ducts inspected; wet duct insulation is usually replaced, and ducts that held water may need cleaning.