In the DR they usually knock or drill a hole in said block where they wish the pipe to enter. The idiot that constructed my bathroom did in fact run the tubeing inside the block for my shower but ran it in such a way that his efforts are nonfunctional and he failed to run any tubeing for the sink and toilet he installed. This was an "expert" construction individual. The "expert" electrician that my wife hired ran ALL my wires using the roll of red #12 wire and took the roll of white home with him. Had I been in country at the time almost everything would have been done differently but that's in the past.
As you wish to have a water tank on your roof and as it is best to have a concrete roof then with careful planning you could accommodate the plumbing to insure an invisable installation. Before pouring the vige de amarre I would lay my tubeing along this route and down through the blocks to their final destination. The use of an elbow and up pipe would insure that the tube in fact extends above the roof. All you need is for this pipe to be in close proximity to where you will have your water tank. The drains must be calculated in and these pipes, if you wish them to be unseen, should be laid prior to pouring the footings and elbowed up in the middle of the footings and through the blocks or through the floor close to the wall.
Rick
|