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Thankyou so much for all the responses.

How can we effectively dowel new to old ? Could you please help. Thanks.

Well, we call it a shear wall around here, but technically it would be retaining wall. Existing masonry wall is going to remain intact, but we plan on building new retaining wall 5-6 feet taller than existing one and backfill. p.s. i did not know about double posting and have removed the other...

Thanks for the suggestion. The problem is , we can not demolish the masonry wall, and thus can not provide heel for the new retaining wall at soil side. So the case being that the existing masonry wall can not be changed, could a new footing be constructed on top of the existing one ?

Is it possible to build a new foundation over existing foundation ? While working on a building site located next to a sloped land, we first decided that shear walls or retaining walls are not necessary, as there already were stone masonry structure to support the soil. We completed the...