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Wet crawl space after heavy rain: what to check

Long rainy stretches put water under a lot of Puyallup homes. Here is how to tell how bad it is and what to do.

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Look before you go in

Open the crawl space hatch and look in with a flashlight before you go any further. Do not crawl into standing water, and stay out if you see wiring, a junction box or a furnace sitting in water. Check for:

  • Standing water, and how deep it is.
  • A vapor barrier that is torn, floating or covered in mud.
  • Insulation that hangs down from the joists or looks dark and heavy.
  • White or dark fuzzy growth on the wood.
  • A strong musty smell.

Check the outside of the house

Most crawl space water in Puyallup comes from outside, and several of the causes are easy to check:

  • Gutters. Fir needles and moss clog gutters quickly here. Water that spills over the edge lands right next to the foundation.
  • Downspouts. Each one should empty at least a few feet from the house, onto a splash block or into a drain line that works.
  • Grading. Soil and beds should slope away from the house. If water pools against the foundation after rain, it is finding its way under the house.
  • Sump pump. If you have one, make sure it has power, the float moves freely and the discharge line is clear.

When it is groundwater

In the valley, the water table rises over the winter. Some homes near the river, Clarks Creek and the low streets north of downtown get water in the crawl space no matter how clean the gutters are. A sump pump and a perimeter drain are the usual long-term fixes. In the short term, the water still needs to come out and the framing needs to dry.

When to call

Call a water damage crew if:

  • Water is standing and not draining on its own within a day.
  • Insulation is wet or falling down.
  • You see mold on the framing or smell it inside.
  • Floors above feel soft or have started to cup.
  • The water came from a broken pipe or drain line.

A crew will pump the space, pull wet insulation, replace the vapor barrier if needed and run dehumidifiers until the wood is dry. Call us and we will connect you with a local company.

Related services in Puyallup

Common questions

Can I put a fan in the crawl space to dry it?

A fan alone usually moves damp air around without drying the wood. Crews pair air movers with dehumidifiers and check the framing with a moisture meter.

Should crawl space vents be open or closed in winter?

Many homes keep them open for airflow most of the year, but close them during a hard freeze to protect pipes. Some homes have sealed, conditioned crawl spaces with no vents. Ask a crew what fits your house.

Is mold in the crawl space dangerous?

Air from the crawl space moves up into the house, so mold under the floor can affect indoor air and smell. It is worth cleaning up and drying the space so it does not come back.

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