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You have a couple options here to improve the drainage of your patio. First, the contractor who did this should be responsible for the repair and if necessary to tear the pad out and repour it correctly. Pouring a thin layer of concrete over the existing pad is not going to work because it is going to leave a cold joint along with a very thin layer. This will be susceptible to cracking and breaking off.

Another option would be to set the porcelain tile without fixing the drainage of the slab. An experienced tile setter could use thin set to raise the tiles nearest the house and effectively slope the tile away from the house. This is going to use a lot more thin set and will add cost to the project. Not the ideal solution, but it is an option.

Lastly, a strip could be saw cut the length of the patio slab near the house and a pool plastic slotted deck drain installed. These drains are only about 2" wide. Most pools have a concrete slab that drains towards the house and these drains are used to run water away from the house.

Unfortunately, most anything that is done is going to be a fix-er-up job other than tearing it out and starting new.

Feel free to post any follow-up questions you may have.

Expert:	Home Improvement Jay
Pos. Feedback:	99.0 %
Accepts:	345
Answered:	7/20/2009

General Contractor

7 years exp. residential home and pool construction; mold, fire and flood remediations.