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WALL THIMBLE (WT)
Wall Thimble (WT) is used when a chimney passes through a wall made of combustible
materials.
The part consist of a roof thimble female half and a male roof thimble half that slide in
each other to adjust wall thickness from 8" to 12". The specific clearances in Table 1
must always be respected. See Table 2 for dimensions of the hole opening in the wall
to respect the air space clearance.
This assembly is made of a two parts. See Figure 59a.
Figure 59a - Wall Thimble (WT)
Installation:
1. Cut opening in the wall to dimension indicated in Table 2.
2. On one side of the wall, slide the Female half in the opening and fix it to the wall
with screws.
3. On the other side of the wall, slide the male half into the opening and fix it to the
wall with screws.
NOTE: A minimum overlap of 2" must be made between the male half into the
female half.
4. Insert the chimney through the opening of the Wall Thimble (WT).
5. The chimney must be well supported or guided on both side of the wall to prevent
any load or offset of the chimney in the Wall Thimble.
Figure 59b - Supports for Chimney passing through a Wall
THROUGH WALL SUPPORT
Chimney that penetrate wall have to be supported at least on one side of the wall,
supporting the section that penetrates through the wall. It can either be supported
by bracing a Half angle Ring (HAR), Anchor Plate (AP), or Anchor Plate Length (APL)
See Figure 59c
NOTE: Refer to table 2 for minimum opening in combustible material.
Figure 59c - Supports for Chimney passing through a Wall
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FLASHING (F)
The roof Flashing (F) is used in conjunction with Storm Collar (SC) for weatherization
on a flat roof. See Figure 60 and 61.
Figure 60 - Storm Collar
Figure 61 - Flashing
ADJUSTABLE FLASHING (F30)
The Adjustable Flashing (F30) is used in conjunction with Storm Collar (SC) for
weatherization on a roof with a pitch 5° to 30°. See Figure 62.
Figure 62 - Adjustable Flashing
NOTE : The flashings are non-ventilated and does not provide for any
reduced clearance to combustible.
INSTALLATION PROCEDURE FOR FLASHINGS
1. Cut opening to dimensions specified in Table 2. See Figure 63a for flat roof and
Figure 63b for a sloped roof.
NOTE: Reinforced the edges of the hole as appropriate for the expected
lead bearing requirements.
2. Slide chimney through the hole.
3. For lateral stability, supports or guides must be used. The Heavy Duty Floor Guide
(WSHD) must be installed either on top or under the roof (See Figure 64b for guide
under the roof). Any supports (AP, APL or WSHD) or a Full Angle Ring must be
installed below.
NOTE: Flashing is not intended to take any side load or wind loads
4. Install flashing over the chimney and the guide/support, screw it and seal it with
the outer sealant S-375.
5. The Storm Collar (SC) is placed around the chimney and sealed to the casing with
outer joint sealant S-375.
The storm collar should not quite rest on the flashing when the chimney is cold (a 1/4"
gap between the collar and the top of the flashing).
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
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