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Kenmore, WA
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Gaston, Oregon
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Gaston, Oregon
Posts: 8083
Joined: Dec, 2003
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 Proper piers for crawl space
[#3] Posted: 05/27/2011 - 1:00:53 PM |  |  |
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R403.1.2 Isolated footings. Plain isolated square or round
footings shall be permitted subject to the limitations in
Sections R403.1.2.1 and R403.1.2.2.
R403.1.2.1 Isolated footings in the crawlspace. Plain
concrete isolated footings supporting a single floor system
whose total loads do not exceed 50 pounds per
square foot (2394 Pa) (40 pounds live load, 10 pounds
dead load) shall be a minimum size of 18 inches in diameter
by 8 inches in depth (457 mm by 203 mm) or 1.70
square feet (0.16 m2) in plan area (15 inches square) by 8
inches in depth (381 mm square by 203 mm) when the
following conditions are met:
1. Crawl spaces are enclosed by a continuous concrete
or masonry foundation.
2. Floor beam spacing does not exceed 48 inches
(1219 mm) on center and the maximum size of
wood floor girders is 4 inches by 8 inches (102 mm
by 203 mm) or 6 inches by 6 inches (152 mm by
152 mm). [See Table R502.5(3).]
Plain concrete isolated footings supporting other floor
loads in an enclosed crawl space shall not exceed 6.25
square feet (0.58 m2) in plan area (30 inches square) by
15 inches in depth (762 mm by 381 mm) or 34 inches in'
diameter by 17 inches in depth (864 mm by 432 mm).
When the axial load exceeds 9,000 lb. (4.0 kN), the footing
shall be designed.
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Jim Katen, Oregon
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Gaston, Oregon
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Proper piers for crawl space
[#4] Posted: 05/27/2011 - 1:11:46 PM | | |
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Oops. My apologies. That's from the Oregon amended version. There doesn't seem to be an analogue in the model version.
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Jim Katen, Oregon
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Kenmore, WA
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Proper piers for crawl space
[#5] Posted: 05/27/2011 - 5:50:17 PM | | |
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Thanks, Jim.
I'm back and have looked it up also.
IRC does not spec. isolated footings. They imply the footing should be designed based on the type of soil. That's over my head.
It's sort of funny the IRC spends so much on wood foundations. I didn't realize they were that common.
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Randy Navarro
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Gaston, Oregon
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Prattsburgh, New York
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Proper piers for crawl space
[#7] Posted: 05/27/2011 - 6:46:37 PM | | |
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Not to drift too far, but......I think it's interesting to note that since HUD code homes live on isolated piers-manufacture install manuals go to great lengths to instruct the ABCs of pier construction. Included will be tables/diagrams to facilitate footing sizing based upon: pier height; general load; point load; soil type; wind loading/roof pitch/wall height; wind zone; snow zone. All the needed information is there.......in black and white.......and sometimes never used.
Greg
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