Rooftop fungus that can leave dark stains on roofing. 

Angled Fasteners

Roofing nails and staples driven into decks at angles not parallel to the deck. 

Apron Flashing

Metal flashing used at chimney fronts. 


Asphalt Roofing Manufacturers Association. Organization of roofing manufacturers. 


A bituminous waterproofing agent used in various types of roofing materials. 

Asphalt Concrete Primer

Asphalt based primer used to prepare concrete and metal for asphalt sealant. 

Asphalt Plastic Cement

Asphalt based sealant material, meeting ASTM D4586 Type I or II. Used to seal and adhere roofing materials. Also called mastic, blackjack, roof tar, bull.


The American Society for Testing and Materials. Organization that sets standards for a wide variety of materials, including roofing.

Back Surfacing

Granular mate