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Crawlspace Drainage

A sump pump is not always a solution for a wet crawlspace.

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Example of a completed crawlspace.

Moisture Effects in Homes

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

In addition to making the crawlspace inaccessible, moisture can create high humidity throughout  the house causing conditions such as:

  • Rot and settling of framing materials.
  • Cupping/damage of hardwood floors.
  • Mold growth on crawlspace floor and subfloor insulation materials.
  • Infestation by insects and rodents.


Drainage solutions may require the following interior/exterior systems: Controlling roof drain/downspout water is extremely important as this is often the major  contributor to crawlspace drainage problems. We take the time during our bid appointments to  determine if this is a contributing factor. Allowing roof water to flow through a crawlspace is  never recommended and connecting a sump pump to a failed downspout system will only recycle  it right back into a crawlspace. In addition, the extra strain can shorten the life of a pumping  system.

Crawlspace drainage requires proper drain piping & appropriate sizes of drain rock as well as a  proper depth of outlet or discharge line and collection drain fields or trenches. Typically, water  can flow naturally by gravity or may be pumped if absolutely necessary. Without the above  elements in place and operating properly, the system may not dry out the crawlspace completely.

If a pump is necessary, we will install it in an accessible basin on the exterior of the foundation  for easy access and maintenance.


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