basement wall anchor spacing

weedyacresApril 24, 2013

We've bought an old house whose 4 basement walls are all bowing inward about 3" or so. We had 3 companies out to give estimates to install wall anchors to stop the bowing and potentially reverse it by occasionally torquing the bolts. The house (and basement) footprint is 25' x 35'

Company A is quoting 16 anchors total: 5 on each long wall and 3 on each short wall. Price per anchor higher.

Company B is quoting 24 anchors total: 7 on each long wall and 5 on each short wall. Price per anchor lower.

Both provide a lifetime warranty that no further displacement will occur.

We're on a pretty tight budget, so my thought is that if I can talk Company B into using fewer anchors, I can save some money. I did some internet research to see what the required spacing is so I can be educated about it. I'm finding 6-8 feet. Basically, it appears that Company B is putting the first anchors in the very corners, then every 5-6', which seems conservative. Company A starts them 6' away from the corner and then puts them every 6' or so.

To those of you experts in this arena: do you need anchors in the corners? And how close do they really need to be?

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brickeyee

They are unlikely to give you a warranty if you do not accept their spacing.

What are the walls made of?

This post was edited by brickeyee on Thu, Apr 25, 13 at 16:38

    Bookmark   April 25, 2013 at 4:37PM
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weedyacres

Poured concrete: a rough aggregate with a skim coat over it, judging by a patch on one wall where the skim coat has chipped away.

    Bookmark   April 26, 2013 at 5:05AM
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brickeyee

"Poured concrete"

It takes a hell of a load to affect poured concrete unless they put in NO steel.

The skim coat is probably hiding a LOT of cracks.

Concrete does not bend all that well.

i would strip all the ski coat to see what the wall looks like.

If the skim coat is not cracked it would appear to have been applied AFTER the wall started to fail to hide the problem.

Is their expansive soil bearing on the wall?

The best thing would likely be forms stripped to fast and then the wall back-filed.
The concrete might have had enough 'give' to just flex without cracking in any major way.
In that case nothing may need to be done.

How are the companies proposing to spread the point loads from the anchors on the wall?

If the wall is badly fractured it is unlikely to behave as a monolithic piece, but a whole mess of smaller sections.

    Bookmark   April 28, 2013 at 4:09PM
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