I've had two estimates on having a 22 X 11 concrete patio poured in my back yard. Both contractors want to attach the patio to my house by drilling into the foundation at the bottom of the siding and putting in rebar to tie into the patio. I am very leery about drilling into the foundation. Is this the correct installation? Won't installing rebar into the foundation cause a potential problem, or void the foundation warranty? My house is 4 yrs old. Thanx in advance, Tommyt
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