My carpenter who installed new doors in my basement cut the new door too short (used old door as guide; there was a subfloor that I ripped out, the old door measured correctly for that, now the floor is lower), and theres a gap. Hes recommended weather stripping to add another inch. Is this my best option? Its a 24 wide hollow core door, the gap is around 2 inches, hes told me it needs extending about an inch.