Answer:
The correct answer is A
Explanation:
Rigid foam board insulation is the one which comprise of the sheets of polyiso, polyurethane or polystyrene foam which is a closed cell as opposite of the open cell.
Closed cell board insulation is strong and possesses the higher R value than the open cell insulation.
Rigid board insulation is the kind of insulation which is used for work on the basement walls, on the flat roofs as a perimeter insulation at the concrete edges of slab.
