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Old 05-24-2010, 08:55 AM   #1
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excavating a crawl space

when you have 4'-5' of fall from high to low side, do you usually dig out the entire footprint for foundation level so crawlspace under house is flat and level, or do you leave natural grade and have a sloped crawl space under house?
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Old 05-24-2010, 09:20 AM   #2
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Is there a foundation down there?
Hopefully its at the same depth
But I've seen some poured at stepped depths to save on concrete costs

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Old 05-24-2010, 01:01 PM   #3
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A sloped crawl is fine as long as you removed the top soil and keep the clearances required:
Footings And Foundations
Prior to pouring any concrete the bottom of the footings must be cleaned out; removing any loose soil, wood or debris. Roots must also be removed. All reinforcing steel must be held away from contact with soil or forms. (Note: The use of steel bars driven into the ground to support rebar is prohibited.) Three inches of clearance is required from reinforcing bars to sides and bottom of unformed footings (cast directly against the dirt surface), and 2 inches clearance is required from sides where forms are used.
Wooden form work located in the ground, or between the foundation sills and the ground, must be removed after pouring concrete.
Floor Joists, Girders And Posts
Wood joists, or the bottom of wood floors closer than 18 inches, or wood girders closer than 12 inches to the ground in the under floor areas, must be redwood or pressure treated lumber. Girders entering masonry or concrete walls must have a minimum bearing of 3 inches and have a minimum of 1/2 inch air space on top, sides and ends unless they are of redwood or pressure treated lumber. Posts supporting girders must fully bear on redwood plates set in or on the pier block. The bottom of posts must be a minimum of 6 inches above grade.
From: http://www.mcvicker.com/resguide/page008.htm

Check with your local Building Department as they will be inspecting.......

Thanks Dave, I needed that, I'm home sick from work.

Be safe, Gary
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