There are two meanings for a roof apron a flashing material similar to a drip edge that is installed at the bottom of a roof channelling the run off away from the fascia and into a gutter.
Roof apron definition.
A narrow plastic wood or metal bar which is used to fasten or hold the roof membrane and or base flashing in place.
1 cap or cover.
Apron flashing a one piece flashing such as is used at the lower side of a chimney that penetrates a sloping roof.
A metal closure set over or covering the joint between adjacent metal panels.
Barge board the board covering the roof timbers on the gable or skillion end of a roof fixed parallel to the roof slope.
2 in a metal roof.
The tallest point of the roof.