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Desired Outcome:
Desired Outcome:
Fully adhered, airtight, and durable sealing that prevents air movement @50pa.
Fully adhered, airtight, and durable sealing that prevents air movement @50pa.
SWS Detail: 3.0102.1 Sealing Non-Insulation Contact (IC) Recessed Light; 3.0102.2 Sealing High-Temperature Devices
Author: Brenna Dunn
Before
Before
Insulation touching flue with a bypass
After
After
Fire stop and heat shield installed
Steps
Steps
1. Ensure clearance from combustibles
1. Ensure clearance from combustibles
Sweep back any debris or insulation to clear space around chase.
Chase should be fully visible.
No combustible materials can be within 1" of listed B-vent.
No combustible material or sealants shall be within 6" of all other high temperature penetration.
Cut back attic floor if needed.
2. Cut sheet metal
2. Cut sheet metal
On one edge of each piece of metal, trace the shape of the flue to cut out so there will be an overlap of at least an inch once placed together.
Alternatively, one continuous sheet of metal can be used to cut a hole into the center of the sheet metal that matches the outside of the flue.
Strips of sheet metal can be used for rectangular flues.
3. Fabricate fire stop
3. Fabricate fire stop
Each piece should extend a minimum of 1" around the flue or chimney in a rectangular shape or at least the size to fully cover the chase opening.
The firestop should secure the vent the required minimum distance from the combustible material while preventing air movement around the vent.
4. Place pieces around flue
4. Place pieces around flue
The cut outs should fit tightly to the flue with an overlap of the two pieces about 1".
Fasten to the attic floor with adhesive or fasteners.
5. Seal around all seams
5. Seal around all seams
Using hi-temp adhesive, seal around all the seams in and around the metal pieces.
6. Create heat shield
6. Create heat shield
Create a heat shield with sheet metal, metal duct, or insulshield.
You need enough to surround the flue with an inch of space between shield and flue.
Height of heat shield shall stand a minimum of 2" above final/post-weatherization insulation height.
7. Secure heat shield
7. Secure heat shield
Heat shield shall surround B-vent flue entirely.
Minimum of 1" space between shield and flue.
Minimum of 6" clearance to chimneys and solid fuel appliance flues.
Dovetail heat shield towards the flue or chimneys to protect the shield from compressing.
Fasten heat shield to attic floor.
No debris or materials should be between heat shield and flue.
8. For non-IC rated canned lights
8. For non-IC rated canned lights
Any non-IC rated light fixture will be replaced with an airtight IC-rated fixture or air tight LED insert.
9. Photo document work
9. Photo document work
Take photo of completed work before insulation is installed that will cover/conceal air sealing work. This is to make sure insulation is not disturbed in the QCI or monitoring processes.
10. Worst Case Draft test
10. Worst Case Draft test
Conduct a Worst Case draft test to verify Category I, II and III are venting safely before leaving home for the day.
Testing shall be recorded using the Utah WAP Worst Case Draft Test form.
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