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What industry or trade specifications are out there for detailing where the poured concrete foundation wall of a new addition joins the poured concrete foundation wall of the existing house? Does the rebar in the new footing and wall get tied into the existing wall, or are short dowels epoxied into the existing wall before the pour? Appreciate the benefit of the experience that’s out there.
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Bob - Both the new footing and the wall should be tied in. #4's at 2'-0" o.c. vertically (usually) into the wall.
Jeff
*Bob you need enough rebar to make the old and new concrete one piece. That takes an engineer.The minimum is a 2' lap joint of your new rebar to your old (a 2' deep hole for each bar). One rebar for each bar in the old foundation (usually 2 near the top and 2 near the bottom.) The bar is #5 around here. The bar is epoxied in to the old foundation.A lot of people do it with less.I would either hire an engineer or trust the builder.