We would like to replace existing concrete pads, some of which have cracked and sunk with pebbles and pavers on top. This area is bordered by a wooden fence, a cement knee high wall and house foundation. We have had a few quotes and only 1 contractor said this is not a good idea as the water will not drain away properly. We live in Toronto so cold snowy winters. I really dont know who to believe and would very much appreciate some experienced advice. Thanks in advance.