First off you need to identify the areas where the floor is bowing to figure out where the floor is butting against the perimeter.
Floor is bowing up.
If water has seeped into the boards they may swell against one another which can cause the bow.
Another important part of installation is the expansion gap.
A moisture barrier is a thin sheet of polyethylene that is laid between the subfloor and the hardwood.
Because soil shifts and house frames settle there is usually a slight variation in floor level.
Bowing or warping of floor boards can occur for several reasons.
How to repair a hump in the floor.
The flooring should be installed leaving a gap of 1 4 inch to 1 2 inch around the perimeter of the room.
Without this barrier moisture can cause buckling.
The higher quality the material the less likely it is to buckle due to moisture.
How to fix bowed floors.
If water seeps up under the flooring from an extremely moist concrete subfloor the adhesive can be weakened causing buckling in the floors.
Check the humidity level of the room and use a dehumidifier if the air is too moist particularly depending on the time of the year.