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4. Cut and frame square holes in all
floors, ceilings, and roof that the chimney
will go through (C) to provide a 2" (50 mm)
minimum clearance between the chimney
and any combustible materials. Do not fill
this space with insulation or any other
combustible material.
5. Every time the chimney passes through
a ceiling or a wall, install the appropriate
firestop (B). When you reach the desired
height, install the roof support (not shown).
(Refer to instructions included with the
support).
6. Then, put the roof flashing (E) in place
and seal the joint between the roof and the
flashing with roofing pitch. For sloping
roofs, place the flashing under the upper
shingles and on top of the lower shingles.
Nail the flashing to the roof, using roofing
nails.
7. Place the storm collar (F) over the
flashing, and tighten it with the bolt
supplied. Finally, seal the joint between the
storm collar and the chimney, using silicone
caulking.
8. Install the chimney cap (G).
9. When a ventilated roof flashing is installed,
precautions are to be taken not to caulk or seal
the ventilating openings.
8.6.4 OFFSET CHIMNEY INSTALLATION
TABLE 2 - MINIMUM SYSTEM HEIGHT WHEN USING ELBOWS
Fireplace model
Chimney model
Vertical installation
Two (2) elbows
Four (4) elbows
After reaching the location requiring the elbow, proceed as follows:
1. To insure a good draft, it is recommended, to have a length of 18 inches (457 mm) from the top of
the unit to the first offset. Install the first elbow; turn it in the required direction. Secure it to the chimney
according to the chimney manufacturer's instructions. In many cases, it is recommended to secure
connections with three (3) ½" (12 mm) metal screws.
2. Install the necessary chimney lengths to achieve the required offset. Lock the chimney lengths
together according to the chimney manufacturer's instructions. In many cases, it is recommended to
use three (3) ½" (12 mm) metal screws. If the offset length is made of two (2) chimney lengths or
more, many chimney manufacturers may require that you use an offset or roof support halfway up the
offset. If penetrating a wall, install a wall radiation shield supplied by the chimney manufacturer.
3. Use another elbow to turn the chimney vertically. Secure the elbow.
HearthStone Quality Home Heating Products, Inc ®
Figure 1 : Installation Instructions
WFP-100
All models (see TABLE 3)
15 ft. (4.6 m)
15 ft. (4.6 m)
17 ft. (5.2 m)
44
WFP-100 Model 8420
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