Envelope commissioning prevents moisture intrusion by verifying proper installation of multiple defense layers and identifies vulnerabilities before they cause damage.
Bulk water control is verified through proper flashing at all penetrations, correct window installation following manufacturer requirements, continuous drainage planes behind cladding, and functioning roof drainage systems. The commissioning agent witnesses installation at critical stages and documents conditions before concealment.
Air barrier continuity is essential for moisture control because air leakage carries far more moisture into assemblies than vapor diffusion. Commissioning verifies air barrier continuity through design detail review, construction observations, and system testing.
Vapor control is addressed by confirming vapor retarders are installed to meet the design details as well as the manufacturer’s installation requirements paying close attention to material and system limitations.
Thermal bridging occurs where conductive materials create heat flow paths through insulation. Commissioning identifies thermal bridges through the review of design details, as well as observations of system components. Common thermal bridges include slab on grade, steel stud framing, exterior wall system fasteners, shelf angles, balcony penetrations, and parapet caps. The commissioning agent recommends thermal breaks, continuous insulation strategies, or detail modifications to minimize thermal bridging impact.
Early identification during construction allows corrections at minimal cost. Post-construction remediation of moisture and thermal issues typically costs 10-50 times more than preventing problems through commissioning.
For moisture and thermal performance expertise protecting your building envelope investment, contact Catalyst Commissioning Group at info@catalystcx.com.