Asked on Jan 2, 2019

How many vents should be there in the crawl space and why?

Lynn SorrellBecky at Flipping the FlipKen Erickson


my question is how many open vents (for crawl space) are required n what if some are blocked?

3 answers
  • Ken Erickson
    on Jan 2, 2019

    Check your local building codes. In our area we close all vents in Oct - Mar timeframe and open them the rest of the year. The vents help allow moisture out of the crawl space.

    • Ken Erickson
      on Jan 2, 2019

      King Country, WA? I so, you don't the low temps like we do in Benton County, WA (Tri-Cities). Closing vents can help keep pipes from freezing and reduce heat loss through the floor. Check with local builders or neighbors to see what they recommend. All the vents that I have seen have either a flapper or Styrofoam plugs.

  • It will depend on your house and building codes for your area. If there are some that are blocked, it's important to get those un-blocked otherwise you could end up with moisture or mold issues.

  • Lynn Sorrell
    on Jan 2, 2019

    Need to unblock the vents they were put in for reason. Air Flow

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