I will be building a deck very soon with the Dek-Block but my wife is worried about the kids "tripping" over the top rail of the pool. Is it OK to set this above the top rail and any suggestions for this if it is OK?

Yes you can. But, there are some draw-backs to going over the coping of the pool: (1) The decking will need to overhang the frame above the pool coping. The maximum overhang we recommend for the decking is 8 inches for 2x6 decking and 5 inches for 5/4 or composite decking. (2) The cut edge of the decking is exposed to the inside of the pool. This is fairly difficult to cut accurately. A circle will need to be scribed on the boards and cut with a jig saw. Controlling the dust into the pool becomes difficult. (3) Placing the decking over the coping makes it difficult to replace the liner or winter cover.

Consider the advantages of putting the decking below the coping. The construction is less time consuming. All of the cut ends of the boards are hidden under the coping and overall this creates a more finished look. This approach also allows for the coping to be removed if the liner needs be to replaced or if you need to attach a winter cover. With the decking at 1/2 inch below the coping, when the coping is stepped or jumped on, the lumber will support it.

Good luck,
Deckman