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Crawlspace Drainage

Water can enter a crawlspace as a result of:
Seepage from poorly functioning footing or downspout lines
Missing footing/foundation drains
Soil Saturation
Damaged drain pipes from residence
High water tables
Seepage through vents or cracks


(Fluorescent dye used during the investigation/estimate process shows downspout water leaking into crawlspace)

In addition to making the crawlspace inaccessible, moisture can create high humidity throughout the house causing conditions which can include:
Rot and settling to framing materials
Cupping/damage to hardwood floors
Mold growth on crawlspace floor and in subfloor insulation materials
Infestation by insects and rodents

Submerged heating ducts can create the ideal environment for mold growth and ground water pollutants which can then be transported into living spaces, contributing to allergies and other health problems.

Drainage solutions may require the following interior/exterior systems:
Proper drain piping & appropriate size of drain rock
A proper depth of outlet or discharge line
Collection drainfields or trenches
Sediment/catch basins
Silt and debris filters

Typically water can flow naturally by gravity or may be pumped if necessary. Without the above elements in place and operating properly, the system may not dry out the crawlspace completely. In addition, the extra strain can shorten the ‘Life’ of a pumping system.

Washington State License # BODINC*332BT | Serving King and Snohomish Counties.

Diagrams: Interior Footing Drain Trench | Typical Crawlspace Pump Assembly

Bodine Construction Services, Inc. Lynnwood, WA 425-778-2557    Eastside - 425-881-2577 Terms and Conditions