Building Envelope Failures
Where Design, Product Selection, & Installation Collide
by Trent Cotney, Partner, Adams & Reese, LLP
(Editor’s Note: Trent Cotney, partner at Adams & Reese, LLP, is dedicated to representing the roofing and construction industries. Cotney is General Counsel for the Western States Roofing Contractors Association and several other industry associations. For more information, contact him at (866) 303-5868 or go to www.adamsandreese.com.)
The building envelope is one of the most important systems in any project. It separates the interior environment from heat, wind, water, vapor, fire exposure, and noise. It also contributes to energy performance, occupant comfort, durability, and long-term maintenance costs. When it fails, the consequences can include water intrusion, mold allegations, damaged finishes, business interruption, insurance disputes, warranty claims, and litigation.
Most envelope disputes do not arise from one isolated mistake. They usually develop at the intersection of design, product selection, and installation. A detail may look workable on paper but fail to address a real field condition. A product may meet a general specification but not fit the surrounding assembly. A substitution may appear equal but change drainage, vapor transmission, thermal movement, fire rating, or warranty coverage. These failures often occur in the gaps between scopes rather than within one clearly defined scope of work.
Architects and specifiers can reduce these risks by treating the envelope as an integrated assembly rather than a collection of separate products. Roofing, exterior wall systems, windows, doors, air barriers, vapor retarders, waterproofing, insulation, flashings, sealants, and penetrations must work together. The most vulnerable points are usually transitions. Roof-to-wall intersections, window openings, balcony connections, parapets, mechanical penetrations, expansion joints, and foundation interfaces deserve special attention. A complete specification should identify performance expectations and responsibility for coordination.
One recurring problem involves reliance on generic details. Standard details have value, but they must be adapted to the project’s climate, exposure, substrate, building height, occupancy, and adjacent materials. A detail used successfully in one region or building type may perform poorly in another. Western projects can face intense weather events. Those conditions can stress sealants, membranes, coatings, and glazing assemblies. Specifications should reflect project location and expected environmental loads, not just the preferred product list.
Product selection also creates legal and practical risk. Architects and specifiers often face pressure to approve substitutions or value engineering proposals after bidding. A proposed product may carry a lower initial cost but introduce different installation requirements, shorter warranties, different maintenance obligations, or reduced performance. The key question is not whether the product appears similar. The question is whether it preserves the design intent and performs within the entire assembly. Written substitution procedures should require technical data, compatibility information, warranty terms, code compliance documentation, fire and wind ratings when applicable, and manufacturer confirmation that the proposed use fits the product’s intended application.
Installation remains the final test of the design and specifications. Even strong drawings and product choices can fail when field execution does not match the intended assembly. Common issues include reverse-lapped flashing, incomplete air barrier continuity, improper fastener spacing, incompatible sealants, missing end dams, poorly treated penetrations, wet substrates, inadequate surface preparation, and failure to follow manufacturer instructions. These are also evidence problems. When a claim arises years later, the parties must reconstruct what happened through submittals, meeting minutes, inspection reports, photographs, daily logs, and warranty documents.
Documentation therefore matters. Architects should consider requiring pre-installation conferences for major envelope systems, especially where multiple trades must coordinate. Those meetings should address sequencing, substrate acceptance, weather limitations, inspection points, manufacturer requirements, testing, and repair protocols. Mockups can provide similar protection. A mockup allows the team to evaluate aesthetics, constructability, sequencing, transitions, and testing before full production begins.
Contract language should also align responsibility with control. Architects generally should avoid accepting responsibility for means, methods, or procedures that remain within the contractor’s control. At the same time, specifications should clearly assign coordination duties for delegated design, shop drawings, product compatibility, manufacturer approvals, and installation requirements. Ambiguity invites finger-pointing. When the contract documents do not identify who owns a transition, a substitution review, or a compatibility decision, each participant may claim that someone else had the duty to resolve it.
Building envelope failures are expensive because they rarely remain confined to one location or one discipline. A small leak can implicate design details and maintenance history. The best defense begins before construction. Clear specifications, project-specific details, disciplined substitution review, coordinated installation requirements, meaningful mockups, and careful documentation can reduce both failure risk and claim exposure. For architects and specifiers, the goal is to close the gaps where design, product selection, and installation too often collide.
