Pipe and conduit sleeves are necessary to route services through walls and roofs, but they can compromise control layers if not properly detailed. This article explains the best practices for sleeve integration in envelope systems, including waterproofing, air sealing, and firestopping.
Sleeve Placement and Sizing
Sleeves should be sized to allow for annular space around the pipe or conduit and be located to avoid conflict with structural elements. In exterior walls, position sleeves above grade or under protective overhangs. For roof applications, use vertical sleeves with flashing boots and storm collars.
Sealing Around Sleeves
- Use firestop putty, mineral wool, or approved caulks for annular gap sealing
- Install flexible or split flashing boots over sleeves at WRB/roof membrane layers
- Apply membrane-compatible primers and reinforce with tapes or mesh
- Coordinate WRB, insulation, and cladding to prevent thermal bridging and water traps
Roof Sleeve Detailing
On low-slope roofs, always extend sleeves vertically with a 12″ minimum upstand and flash with base and counterflashing. Use pitch pockets only if approved by the roofing manufacturer. On steep roofs, use neoprene boots or lead flashings sealed under shingles. Coordinate insulation wrap or cover board interface around penetrations to ensure continuity.
Inspection and Maintenance
Label all sleeves and inspect for air and water seal integrity before covering. Confirm compatibility with WRB or roofing systems and maintain a record of all firestopped penetrations for UL compliance. Reinspect annually in high-exposure areas such as roof decks, penthouse walls, and mechanical shafts.
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