Our 30'x 23' concrete deck is sinking and needs repair. The support beam on one side has rotted and we are having a tough time finding anyone to replace it. The concrete has also started to flake due to freezing/thawing. It stands over 10' off the drive way into the basement garage. Do we tear it down and replace it? What with? Do we just repair the support? How and who could do it? We love the deck and don't want to lose it!