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repairing a damaged rubble stone foundation

Posted by bobwt1 (My Page) on
Sun, Jul 27, 08 at 21:03

I am jacking up a 100 year old house that was built on a dry rubble foundation with mortared faces above grade. I want to pour a concrete bond beam over the existing foundation. Is this a bad idea? I have read that these types of foundations are very sensetive to the introduction of modern high strength mortars. I have found several voids in the interior of the foundation, thus the thought of a bond beam to bridge possible voids. Should these be repaired and if so what kind of mortar should i use? We have very hard rocks here so I was thinking type s. Any incite will be greatly appreciated.

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RE: repairing a damaged rubble stone foundation

You need a geotechnical engineer to determine the soil type and bearing capacity.

While a bond beam can spread loads out, it will not do any good if the rubble footprint is to small to support the additional load.
The old footing can tend to concentrate the load, defeating the load spreading of the bond beam.
This is a problem that needs a careful sight inspection to determine what the best way to proceed is.

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