Final answer:
Roofing must be installed around a chimney using flashing, which includes base flashing, step flashing, and counter flashing to prevent water infiltration.
Step-by-step explanation:
The correct way to install roofing material around a chimney is by using flashing. Flashing is a thin sheet, usually made of metal, used to direct water away from critical areas of the roof where the roofing materials meet protrusions such as chimneys. It is essential for preventing water from entering the building through joints or small openings between the roof and the chimney.
Proper installation of flashing around a chimney typically involves several steps. First, the base flashing is applied, which is an L-shaped piece of metal that wraps around the chimney and is tucked underneath the shingles. This is followed by step flashing, which uses rectangular pieces that are woven into the shingles and bent to hug the sides of the chimney. Finally, counter flashing is used to cover the top edges of the base and step flashings, and it is anchored into the chimney masonry with mortar to provide an additional layer of protection.