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7. Once you have cut through your roof and framed the joists, it is time to work outdoors.
Authorities require that the chimney extend not less than 3 feet above the highest point where it
passes through the roof of a building and not less that 2 feet above any portion of the building
within 10 feet. You will need to install a roof flashing. The roof flashing slides over your
chimney pipe and goes under your shingles. Once you have done that, check that everything is
plumb, and nail the flashing into the roof deck. Seal the joint between the shingles and the plate
with silicone.
8. Next, slide the storm collar down the chimney until it contacts the flashing. Tighten the nut and
bolt and seal the collar to the chimney with a waterproof, non-combustible silicone sealant.
Finally, twist on your rain cap and you can head back inside. If the chimney extends more than
5 feet above the roof deck, roof guys with telescoping legs and draw bands are required.