On 9/6/2020 12:00 PM, Woofgang wrote:
I did a search on this as we are getting ready to put in a huge patio in
the back and the contractor said he would tie it into the house to keep
it from moving.* We're in MI with poor drainage - lots of clay ground
here.* What is the recommendation for that type of soil other than the
obvious of proper ground prep?

We had a badly worn and cracked poured concrete patio in our backyard
right off a sliding glass door from a family room. The patio was flush
with the outer wall of the cinderblock foundation. There was
considerable deterioration of the near edge of the concrete due to
chronic moisture and slow settling of the concrete creating a
non-parallel surface against the foundation. Our masonry contractor
strongly advised us to have him leave an inch of space between the
foundation and near edge of the new one to minnimize the risk of similar
problems with the new pour. We took his advice. 8 years later the
entire patio slab, including the area immediately adjacent to the house
looked as good as the week the slab was poured.