When the pressure on the roof gets low enough the pressure differential between the underside of the flap and the top of the flap causes the roof flap to pop up.
How do roof flaps work.
The roof flap may not be a large piece of equipment on cars but they are important to keeping all for tires firmly on the track.
The edge of the roof has thin metal flashing that helps water drip off the roof without damaging the home or causing a leak.
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As shown at left the roof flaps are flaps of metal that are normally flush with the roof.
Open valleys have metal flashing to protect this critical area of the roof.
The roof flaps job is to disrupt that airflow and prevent lift.
The decision to implement a safety device to keep cars on the ground came after two crashes in 1993.