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Frost Line in Seattle, WA

Posted by Andrew Smith on September 20th, 2002 05:12 PM
In reply to Posts and how deep is the frost line by Joe Glunt on May 3rd, 1998 06:55 PM [Go to top of thread]

22 of 23 people found this post helpful

The Seattle Department of Construction and Land Use stipulates 18" as frost line depth for projects within city limits. Nearby Tukwila, WA uses 12".

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