Adding To A Concrete Block Wall

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  #1  
Old 08-05-06, 10:00 PM
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Adding To A Concrete Block Wall

We have an 8 ft tall Concrete Block Foundation Wall which is 12 inches too short. We need to add a 4' tall by 12" concrete block addition.

Any suggestions how to tie this 12 inch addition to the existing wall? The existing wall used rebar so we can't just knock out the half blocks to tie into the wall. We can't use a metal band to join the new wall because we aren't going all the way up with the wall.

So far no contractor wants to help us with this problem because it is too small of a job.
 
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Old 08-06-06, 04:40 AM
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Originally Posted by BettyC
We have an 8 ft tall Concrete Block Foundation Wall which is 12 inches too short. We need to add a 4' tall by 12" concrete block addition.

Any suggestions how to tie this 12 inch addition to the existing wall? The existing wall used rebar so we can't just knock out the half blocks to tie into the wall. We can't use a metal band to join the new wall because we aren't going all the way up with the wall.

So far no contractor wants to help us with this problem because it is too small of a job.
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Are you saying the 8 ft tall wall is too short vertically or do you mean the wall length needs an additional few feet of length?

I shall assume you want to add to the horizontal length and you feel you need to use a 12" block. I presume this existing block wall has been backfilled between original excavation and wall. Your new footing needs to bear on undisturbed soil and not backfill. This can be accomodated a number of ways but you need o dig down initially and catch the original footiing with a pier so the new footing can bear down with the footing of the original structure.

I really doubt is is necessary to tie a 12" (very stable block especially when compared with an 8 " block) to the existing block structure unless this area has some undo forces at work we doon't know about. If you are using 12" blocks one can also obtain 12" half blocks for every other course as the mason builds up the new lead to the existing corner or walll section.

bs5
 
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Old 08-06-06, 09:31 PM
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Picture of Concrete Wall Problem

Long story . . . we had a really, really, really bad contractor. Here is a picture of the problem:

http://www.flickr.com/photos/[email protected]/208676220/

Problem 1: When the contractor did the foundation wall extension, he didn't tie the wall into the retaining wall.

Problem 2: He didn't put footers or have an engineer approve the concrete slab before the pour. We had to do a 12 inch perimeter pour with piers to correct the foundation problems.

The house had to be extended 12 inches because of the perimeter pour and the picture does not show the 12 inch slab extension. Hopefully the picture clarifies our problem.

We have called a lot of contractors to add the foot of concrete block and tie the wall into the retaining wall. The job is too small and no one wants to do it. We are on our own.

We have asked at Home Depot and Lowe's . . . no one knows what we should do. Somehow we have to get the block wall tied to the retaining wall.

One friend suggested going out a few feet and up about 3 ft. The framing could then go on top of the new extension and we could use landscaping ties to do a planter to join the extension to the retaining wall.

Sounded like a good enough plan . . . however we don't know how to tie the new concrete block to the old concrete block. Plus we don't know where to purchase the funky foundation blocks . . . Home Depot doesn't carry the wider ones.

Any suggestions?
 
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Old 08-06-06, 09:41 PM
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Adding To A Concrete Block Wall

A place like Home Depot is the worst place to go for any structural/foundation problem.

I have no idea how you could get a permit or pass a footing inspection.

The only thing to do now is hire a professional to determine the best solution. Your photo shows only enough to scare an engineer regarding the long term life if nothing is done.

Your retaining wall obviously retains some soil than can get very heavy and cause strong forces and movement when it gets wet.

The 8" block are not "flunky" but the use of 12" might fit your details better. Certainly, you need to have everything tied together to get the maximum strength - that is more important than the strength of any one material.

Dick
 
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Old 08-06-06, 10:13 PM
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How To Find A Professional or DIY

Our first contractor . . . we never want to see ever again. He has cost us about $20K in repairs, overcharging and engineering fees for his bad work.

The concrete professional that poured the perimeter fixing the original work didn't want to do this job. We have tried concrete block specialists and no one wants to even come out to quote such a small job.

So . . . . now we are stuck with a DIY job but we have no clue how to tie everything together.
 
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Old 08-07-06, 04:31 AM
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Somewhere, a qualified person/contractor/engineer exists and can help you. This does not appear to be a do it yourself project. I hope you don't intend on saving the existing (OLD) wall. One of the first considerations has to be how to remove and replace it safely and as efficiently as possible. (or so it appears from this perspective)

There are many possibillities for tieing masonry or concrete foundation walls together mechanically. The best methods involve proper planning from the beginning. I believe in this case as I view but one picture one needs to locate firstly a structural engineer for assistance.

Sorry I can't be of more assistance but sometimes these things need more thorough analysis than one an provide on a message board. I wish you luck and please keep us posted of any progress in seeking a qualifed engineer and contractor.

bs5
 
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