anyone have any suggestions about connecting an addition foundation to an existing stone foundation?
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Well, You could always scribe it to fit
OK I'm sorry...clean the stone adjacent as good as possible. Remove loose mortar and smaller loose stone.
Make sure the stone wall is good on the inside or shore it up so the weight of the new plastic crete doesn't cause a blowout.
Form as close as possible to the stone, then take a separate plywood and scribe it to fit the stone roughtly. and screw it toi the forms. No need to be too tight. Next step takes care of gaps up to an inch.
When the scribed form is close and screw in on both sides. use ties or tiewire or metal banding strap to feed through at each foot of elevatiuon and use screws to tie this to the for. This will keep it from spreading.
once you are confident in this structural portion and it is braced plumb, then use a can or two of spray foam to seal the gap. Don't overdo it, especially to the inside. This will save you from too much leakage.
other stuff - if you want to, you can also paint down the stone where the connection is with bonding agent, or drill pins for rebar in. I use the bonding agent, but not rebar. Our stone walls here could crumble apart from drilling, and the irregular texture of the wall will grip the new enough to keep from shifting. I don't like the idea odf transferring via rebar, any stress in the new wall to one or two stones in the old wall. That seeems like it can only lead to that stone separating from the old wall along the mortar joint.
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great advice, thanks for the reply. I was even thinking about pouring a wall parallel to the stone wall, extending threaded rod through the new pour and the stone wall, past the stone an tie it to the floor joists of the house. Overkill? probly
It's been done.
Much of this is a judgement call.Only your engineer knows best! If flying by the seat of your pants, get in touch with your inner Engineer.I'm plumb out of cliche`s for now
Welcome to the Taunton University of Knowledge FHB Campus at Breaktime. where ... Excellence is its own reward!