layers of asphalt impregnated felt, usually ballasted with 3/8"
nominal pea gravel.
3 or 4 Layers of Asphalt Impregnated Felt makes a water tight barrier
Hot Asphalt contains V.O.C.'s and can be dangerous to install
• Requires aggregate on top to prevent black asphalt top coat
• Degrades rapidly without surface protection
• Aggregate collects dirt. Also must be removed for repairs
or additional coatings.