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Old 02-07-2010, 10:37 AM   #1
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concrete footings for retaining wall


We're building a poured retaining wall (about 4' high) and we're just about ready to pour the footings. There will be plenty of rebar but I'm wondering if it is worth adding fiberglass (or anything else) the concrete. The additional cost for the fiberglass is low, so if it adds any strength, I'd definitely use it. Thanks.

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Old 02-07-2010, 10:41 AM   #2
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concrete footings for retaining wall


just rebar and a keyway in footing would help. make sure your footing is large enough to handle the lateral push of the fill

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Old 02-07-2010, 10:47 AM   #3
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concrete footings for retaining wall


IMO, no, the fiber will have no beneficial effect in this situation.
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Old 02-07-2010, 12:27 PM   #4
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concrete footings for retaining wall


we use perf'd ADS pvc which comes in 100' coils &, rarely, perf'd s&d pvc - apron store or plumbing supply,,, jo's right but, in truth, fiber's got little beneficial effect to those who know how to place, finish, & joint conc properly - imn-s-hfo, that is

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Old 02-07-2010, 12:47 PM   #5
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concrete footings for retaining wall


fibre is used on slabs. footings don't benefit from fibre.
Lots of rebar is good.
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Old 02-07-2010, 03:05 PM   #6
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concrete footings for retaining wall


my post stands - don't see any need for fiber even on flatwork,,, on vert dec sculptured, yes,,, #5 bar is code - 4 runs - 6's better of # 6

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Old 02-07-2010, 05:10 PM   #7
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concrete footings for retaining wall


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just rebar and a keyway in footing would help. make sure your footing is large enough to handle the lateral push of the fill
Thanks for all of the responses. So, no fiber. Btw, what is a "keyway"? Thanks.
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Old 02-07-2010, 05:23 PM   #8
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concrete footings for retaining wall


A rigid concrete retaining wall should be detailed, especially the footing size. A simple strip footing is no where near adequate. Drainage and backfill behind the and drains are necessary.

If it is only 4' you can build a segmental retaining wall with no footings permitted since footings are detrimental to this type of wall. You usually need no engineering, unless you are a strange location. With engineering, they can be built 40' high. The big question is whether you wand a smooth face or a colored stone-like face.

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Old 02-09-2010, 04:28 PM   #9
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concrete footings for retaining wall


a keyway is just a depression in the footing about 3-4"wide and 2-3" deep. usually in the center of were the wall will be. it works inunison with the rebar that will protrude from the footing. it really keeps the bottom of the wall from kicking. just make one from a 2x4. put a handle on the top and 45 the bottom sides to create a channel.
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Old 02-09-2010, 05:00 PM   #10
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concrete footings for retaining wall


Quote:
Originally Posted by Jeremy Hillary Boob, PhD View Post
Btw, what is a "keyway"?
Here's a visual:
http://www.sweethaven02.com/BldgCons...02/fig0638.jpg

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