Agenda

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Tuesday, August 11, 2026
9:00 am – 4:00 pm PDT

Agenda:
Presented by Juan Villanueva and Victoria Chekene, GC

Consequences of Moisture — Why Moisture-Resistant Design Matters

• Sources of interior moisture — occupant activity, plumbing, ground moisture, and materials moisture
• Plumbing leaks as common water-intrusion sources — among the most frequent failures seen in forensic investigations
• Air movement and moisture movement within buildings — air leakage, vapor diffusion, capillary action, and bulk water
• California climate zones — how moisture risk and control strategy differ across marine, coastal, hot-dry Central Valley, and cold alpine zones
• Effects of uncontrolled air and moisture movement in buildings:
  • Mold and indoor air quality
  • Energy loss
  • Higher operating expenses
  • Damage to building systems and materials
  • Reduced occupant health, safety, and comfort
• The cost of getting it wrong — water-intrusion claims, repair expenses, and construction-defect exposure in California
• Forensic perspective — what forensic investigation reveals about how and why envelope assemblies fail

Designing and Constructing Moisture-Resistant Foundations

• Designing for site water table location, drainage; grading to move water away from foundations
• Under-slab vapor retarders and capillary breaks (CALGreen and the California Building Code, ASTM standard)
• Below-grade waterproofing — blindside (pre-applied) versus post-applied membranes
• California considerations — expansive and clay soils, hillside and cut-and-fill sites, and high or seasonal water tables
• Forensic Case Study — a below-grade or podium-deck leak: investigation, root cause, and repair

Designing and Constructing Moisture-Resistant Wall Systems

• Air, moisture, and vapor barriers; weather-resistive barriers (WRB) — two layers of WRB + drainage layer required behind exterior plaster (stucco) over wood-based sheathing / plaster (stucco) a frequent California defect issue
• Exterior cladding systems (stucco, siding, masonry veneer, metal panel) and drainage planes / rainscreens
• Controlling moisture at the base of wall — weep screeds and flashing
• Integration of doors, windows, curtain walls, and storefront — sill pans and head flashing
• Moisture-proofing wall penetrations and transitions
• Field water testing of installed assemblies — ASTM E1105, AAMA 501.2, and ASTM E2128
• Forensic Case Study — window or cladding water intrusion: testing, defect attribution, and expert findings

Designing and Constructing Moisture-Resistant Podium Decks

• Waterproofing over occupied space — split-slab, plaza, and podium decks between a structural slab and a wearing surface
• Protected-membrane systems (under overburden) versus traffic-bearing systems (exposed walking decks, ICC-ES AC39-evaluated assemblies)
• Overburden and drainage — pavers on pedestals, topping slabs, planters, drainage composite, and slope to drain
• Penetrations and transitions — columns and walls, drains, expansion joints, curbs and parapets
• Forensic Case Study — podium waterproofing failure at a ±700-unit HOA over post-tensioned podium slabs, Bay Area: $8 million settlement

Designing and Constructing Moisture-Resistant Roofing Systems

• Roof assemblies — low-slope membrane roofs and steep-slope shedding roofs
• The roof system as part of the air and vapor control layer
• Roof-to-wall connections, parapets, and penetration flashing
• Water management — slope, drainage, overflow protection, and maintenance access
• Attic ventilation and condensation control
• California considerations:
  • Cool-roof and reflectance provisions under the California Energy Code (Title 24, Part 6)
  • WUI Class A assemblies and ember-resistant venting (Title 24, Part 7)
  • Alpine and mountain roofing — snow, ice damming, and freeze-thaw in the Tahoe, Truckee, and Mammoth regions
• Forensic Case Study — roofing and attic-ventilation failure at a ±180-unit HOA of townhomes and single-family homes, Bay Area: $33 million settlement (reconstruction in process)

California Code Compliance & Doing It Right

• Where the balcony inspection laws came from — the 2015 Berkeley balcony collapse
• Exterior elevated element (balcony and deck) inspection laws:
  • • SB 721 — rental apartments of three or more units (Health & Safety Code §17973); first deadline extended to January 1, 2026 by AB 2579, then every six years
  • • SB 326 — condominiums and HOAs (Civil Code §5551); first deadline passed January 1, 2025, then every nine years
• California’s construction-defect framework — the Right to Repair Act (SB 800, Civil Code §895 et seq.) and the standard of care
• Forensic Case Study — a code-compliance or balcony (EEE) matter (case to be finalized)
• What keeps projects out of litigation — comprehensive drawings, good contracts, preconstruction meetings, and trade coordination
• Building-envelope peer review and waterproofing detail packages (AVELAR services)
• Field quality control — third-party inspections, water and electronic leak detection testing, and documentation
• Takeaways to carry back to your next project
• Questions and discussion

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