F. Cut Out Hole in Roof

Refer to Figure 8.9.

Plumb from roof to center of chimney.

Drive a nail up through roof to mark center of pipe.

Measure to either side of nail and mark the 17 in. x 17 in. (432 mm x 432 mm) opening required.

Measure opening on the horizontal; actual length may be larger depending on roof pitch.

Cut out and frame opening.

Refer to Chapter 25 of the Uniform Building Code for roof framing details.

G. Complete Installation

Warning! Risk of Fire! You MUST maintain 2 in. (51 mm) air space to insulation and other combustible ma- terials around the chimney system. Failure to do so could cause overheating and fire.

Keep chimney sections from separating or twisting.

You may secure straight chimney sections at the joints with screws no longer than 1/2 in. (13 mm).

H. Install Flashing

Slip the flashing over the chimney.

Nail the flashing to the roof. Keep gaps between flashing plate and roof to a minimum.

Notice: Roofing shingles must be below the flashing plate on the lower side of a sloped roof and over the flashing plate on the sides and top.

Caulk the flashing plate and roof junction as well as the vertical seam on the flashing. All nail heads must be caulked with a roofing sealant.

Figure 8.9

Ceiling/Attic Construction

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Heatilator • Birmingham BIR42 • 4059-308 Rev J • 1/11

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Heatiator BIR42 owner manual Cut Out Hole in Roof, Complete Installation, Install Flashing

BIR42 specifications

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