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6. Now, you can add additional chimney sections. Continue adding chimney lengths
until a height of about 2 feet below the next ceiling level. An attic insulation shield
must be installed where a chimney passes from a lower living space into an upper
living space or attic space. It is designed to keep insulation materials away from
the chimney. A second attic insulation shield must be installed if your chimney
passes from a lower living space into an upper living space. As wee, you must
enclose all sections of the chimney where is passes through a living space. Elbows
(15
o
or 30
o)
are used when you need to offset your chimney to clear an obstruction
or to avoid having to cut joists.
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.