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Why basements grow mold

Cool concrete, seepage after rain, high humidity, poor airflow and leaks that were never fully dried give mold everything it needs.

Where to look

Behind furniture against outside walls, under carpet near where water once came in, in storage rooms with cardboard boxes, around the water heater and on the underside of stairs.

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Mold on a basement wall

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Small areas

The EPA suggests homeowners can clean small areas, under about ten square feet, on hard surfaces with soap and water, gloves and a mask.

Larger growth

Mold over larger areas, inside walls or on porous materials needs containment and removal by a trained crew. See mold remediation.

Prevent mold

  • Run a dehumidifier
  • Fix leaks fast
  • Keep gutters clear
  • Use plastic bins
  • Leave space behind furniture

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Fix the moisture

Mold returns unless the water source is fixed: seepage, a leak, condensation or humidity.

Dehumidifiers

A dehumidifier set around 50 percent humidity keeps basements from feeling damp, even in winter.

Water already inside?

This article is about basement mold in west seattle homes. If water is already on the floor, the order is the same in every West Seattle home: stop it at the valve or stop using drains if a floor drain is backing up, keep away from wet outlets and the furnace, photograph the water and the source, and call for help. Every hour water sits in a finished basement adds to what has to be cut out later.

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What it tends to cost

The bill after basement mold in west seattle homes goes up with time, dirt and finished space. A puddle caught early on bare concrete is a short visit. The same water found days later under carpet in a finished family room can mean new pad, new drywall and most of a week of equipment. Ask how the price is set before work starts and whether the company bills insurers.

West Seattle homes and basement mold in west seattle homes

A few things about West Seattle shape basement mold in west seattle homes: many homes have basements or crawl spaces, much of the peninsula sits on slopes that send groundwater toward foundations, the rainy season runs from October to April, and older houses still have galvanized pipe and clay side sewers. Knowing where your main valve and floor drain are, keeping gutters clear and checking the basement after every long rain covers most of the risk.

What to ask a provider

When you call about basement mold in west seattle homes, ask how quickly they can arrive, what they will measure, whether they check behind finished walls and under pad, how long drying should take and how they price it. Ask for a Washington L&I registration number and proof of insurance, and whether they handle the rebuild. Clear answers on the phone are a good sign.

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Common mistakes with basement mold in west seattle homes

People dealing with basement mold in west seattle homes most often wait to see if it dries, rely on a household fan, put carpet back on wet pad or throw out damaged things before photographing them. Each one adds drying days, invites mold or weakens an insurance claim. Moisture readings settle whether something is truly dry.

Keep reading

For more on basement mold in west seattle homes and the cleanup that can follow, start at water damage restoration in West Seattle, or see flooded basement cleanup and structural drying.

Behind finished walls

Mold behind drywall often shows only as a smell or a slight stain at the bottom of the wall. Moisture readings find it.

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Clearance

After large removals, some owners order an independent check before walls are closed.

A West Seattle homeowner's calendar for basement mold in west seattle homes

Most problems related to basement mold in west seattle homes show up at predictable times: the first big fall storms when gutters are full, the long wet stretch from November to March, the occasional winter cold snap and atmospheric river storms. A few reminders on the calendar, such as cleaning gutters in November, checking the basement after big storms and looking in the crawl space twice a year, prevent most emergencies.

When to call a professional about basement mold in west seattle homes

If water is spreading, if it reached finished space, if it came from outside or a drain, or if you cannot find where it is coming from, it is time to call. With basement mold in west seattle homes, a provider with meters and a thermal camera can find the edges of the water in minutes, which is hard to do by eye.

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Window condensation

Cold basement windows collect condensation through the winter. The water runs down onto sills and drywall, which is a common place for mold to start.

Storage

Use plastic bins on shelves instead of cardboard on concrete.

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If you find mold

  • Find the moisture
  • Do not disturb large areas
  • Photograph
  • Call for inspection
  • Call your agent if a leak caused it

Ceiling stain after days of rain? Ask what to do tonight.Open 24/7 · Talk to a local provider in West Seattle

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Questions people in West Seattle ask

Is basement mold dangerous?

It can affect people with allergies or asthma.

Does bleach work?

Not on porous materials.

Talk to a local provider

Get basement mold in west seattle homes handled in West Seattle today

One call reaches a restoration company that works all over West Seattle, from Alki to Arbor Heights and Delridge. They walk you through the plan and how the price is set before anything begins.

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