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Retaining wall footing using existing sidewalk


Hello from Historic Columbia Pennsylvania.  You probably already know of Columbia because we single-handedly stopped the whole invading Conferate army in thier tracks.  It resulted a in the Battle of Gettysburg.   Columbia also dodged a bullet by losing out on becomming this nations Capital by one vote.  Columbia lost out to Washington DC which had cheaper land since it was swampland at the time.                     http://www.columbiapa.net/home-redirect/history/


So my house is a duplex built in 1930.  There is a retaining wall for a raised flower bed which I would like to replace.   Next to the retaining wall is a sidewalk which is 30 inches wider than needed.  ( See attached a photo )  30 inches out from the retainig wall is the expansion joint line.  Can I build the retaining wall right on the sidewalk?   Some have told me I have to cut and tear tear out all the walkway which is not part of the footing.  I have heard that the weight of the wall will push up the other side of sidewalk.  I also heard that water would get between the new wall and concrete and damage it during the winter freeze.      I figure if I cut the concrete sidewalk at the existing epansion joint and build the wall on top usong construction adhesive.  Caulk the bottom where the two meet then backfill with dirt.

Fist time posting here.   I love watching Ask TOH.
Thanks for your time and consideration


Re: Retaining wall footing using existing sidewalk

A retaining wall needs a footer and a sidewalk is not designed as a footer.




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