Attaching cladding systems through continuous exterior insulation (CI) requires careful coordination to maintain structural integrity and control layer continuity. This article reviews bracket systems, fastener strategies, and thermal bridge mitigation methods for optimized performance.
Challenges of Cladding Attachment Over CI
Penetrations through insulation can lead to significant thermal bridging and water intrusion risks. Without proper detailing, fastening systems can compress CI, disrupt the air barrier, and create entry points for moisture at fastener penetrations.
Attachment System Options
- Thermally broken Z-girts or HCI brackets designed for insulation continuity
- Stand-off clip systems that bypass insulation with minimal contact points
- Continuous sub-framing systems with vertical rails that attach to structural studs or sheathing
- Fastener-only systems with pre-drilled guides and sealant collars
Sealing and Barrier Continuity
Install self-sealing gaskets or apply sealant behind clips and fasteners at every penetration. Coordinate air barrier sequencing so that bracket baseplates sit on top of cured membranes. Flash all support hardware and provide additional detailing at cladding terminations and changes in plane.
Installation and Inspection
- Verify bracket alignment and spacing using manufacturer layout plans
- Pre-drill pilot holes to avoid damaging insulation or air barrier membranes
- Ensure fasteners penetrate structural framing, not just sheathing or CI
- Inspect flashing and sealant continuity at every bracket or clip
Document bracket installation and flashing layout with progress photos and inspect prior to cladding installation.
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