We had planned for a drain in the laundry/mud room of our new home, but now the drain is almost leveled with the tiles (still construction going on). The tiles pitch is barely noticeable. How it is going to help us protect the rest of this level from any water leakage in the laundry/mud room? Is there any minimal pitch required for the water to go to the drain and not to my hallway?

The house is on a hill, so laundry/mud room is being entered from the garage, and another door is to the hallway with engineered wood flooring. The entrance to the house, hallway, and a finished, partially exposed family room are at the same level.

The builder states that:

“The laundry drain is set up as an overflow drain. It has a slow even pitch. If there is excessive water in that room, you may need to direct it to the drain with a squeegee.”

Is this OK?

The room is 7.5’ wide, if I placed a 6 feet plank over the drain and rotate it what should be the clearance above the drain (distance from the drain surface to the plank above) for the minimal pitch so the drain works properly and we don’t have a damage to the rest of the house in case of any malfunction in the laundry room?