Hello Jerrispond,

You wrote:

Concrete blocks(8x8x16) three high with steel rebar yes,but you should drill
into the oldslab because it won't bond. Also a 6 inch cove sand around the
inside
before the liner goes in would support some of the weight.That would be my
plan,

I agree....you NEED rebar.

What is rebar please?
--
Peter