ROUND SUPPORT (RDS) & SQUARE SUPPORT (SQS)
Typical round and square support installations are shown in drawings 1 thru 4 on page 13.
The clearance between the chimney and combustible material must not be less than 2" except in areas directly
shielded by the support. See the rough opening TABLE 3 for the minimum frame dimensions. Do not fill this area
with insulation.
If the support is installed in a ceiling with an attic directly above, the support also acts as the attic radiation shield.
1. Locate the chimney in a convenient place as near as possible to the appliance outlet. Cut and frame the holes
in the floor, ceiling, and roof where the chimney will pass.
2. From below, push the support into the framed hole. The support must protrude at least 4" below the finished
ceiling. Nail the support to the framed joist using 8 3" spiral nails or # 10 X 2 “ wood screws. Place the Finish
Collar around the support and fasten it to the ceiling using the two screws provided.
3. Attach the flue extension (found in the support box) to the bottom of the first chimney length using the 3 metal
screws provided. Put this chimney length in the support. Push it down firmly in place.
4. From below, install a firestop radiation shield in each floor through which the chimney passes.
5. Stack the next chimney length on the first length. Fasten the three screws supplied through the holes to fas-
ten the chimney together. Continue until the required chimney height is reached.
ATTIC AND ROOF AREA
6. At the attic level, install a radiation shield
(RS) from below. With the addition of a
storm collar to close the top this shield
acts as the joist and the attic radiation
shield.
If your chimney is enclosed in the attic
proceed as folows:
7. Put the roof flashing in place. Seal the
joint between the roof and the flashing
with roofing tar. For sloping roofs, place
the flashing under the upper shingles
and the on top of the lower shingles.
8. Nail the flashing to the roof using roofing
nails. Place the storm collar over the
chimney and the flashing. Tighten it in
place. Caulk the joint between the chim-
ney and storm collar.
9. Fit the rain cap to the top of the chimney.
Screw the two metal screws provided
through the straps and into the top chim-
ney length.
RIS Owner's Manual
ICC Chimney
13
