13 34 24 (13121) - Pre-Engineered Sand Storage Structure

.4 Asphalt shingles may be used where roof slopes are greater than 2:12..5 Provide natural roof ventilation using salt corrosion resistant premanufactured units, symmetrically spaced and located near top of roof. Free ventilation area shall be minimum 1.3 m2. .6 Where metal roofing and cladding are used, install on wood spacers applied to wood sheathing designed to act as a barrier to the ... ................
................