I'm looking to do a patio over cement. The patio is in great shape. I called two different paver companies. One company suggested I drill weep holes in the cemement and fill with gravel for drainage. Another supplier told me that this is not needed and a 1" base of sand will be fine. I'm worried about the thraw, freeze cycles and don't want the pavers to heave or deterioate. Another alternative is to build up the border of cement patio with larger stone to create like an area that would let me add 4" base of the patio and then lay my sand and pavers. Any help is appreciated. This is my first time bidding on a job like this.