Answer
The air inside the house remains still but outside the wind blows over the roof. Thus by bernoulli's theorem the pressure over the roof become low as compared to inside. This difference is pressure exerts an upward force on the roof.
Work Step by Step
The air inside the house remains still but outside the wind blows over the roof. Thus by bernoulli's theorem the pressure over the roof become low as compared to inside. This difference is pressure exerts an upward force on the roof.
