Building Envelope Failures

The building envelope is the system of components that separates the interior conditioned space from the exterior environment: the roof membrane, exterior wall cladding, window and door assemblies, below-grade waterproofing, and the connections between all of these systems. When any component of the envelope fails — whether through material degradation, installation deficiency, impact damage, or design deficiency — moisture intrusion follows.

Building envelope failures in commercial and institutional properties can be particularly complex because the building components involved are designed to be weathertight as a system. A failure in one location — say, a failed window perimeter sealant — may introduce water that travels through the wall assembly and appears on interior surfaces many feet away, making the source of intrusion difficult to identify without systematic investigation.

Roof Membrane Failures: Punctures, seam separations, flashing failures, and improper drainage conditions allowing water to infiltrate the roofing assembly and migrate to the structure below.

Window and Curtainwall Failures: Failed perimeter sealants, gasket deterioration, and frame failures in large commercial window systems allow wind-driven rain to penetrate at pressure differentials that exceed the design ratings of the seal.

Exterior Cladding Failures: Brick veneer moisture intrusion, EIFS/stucco system failures, and metal panel system seal failures can introduce water behind the cladding face with limited visible indication on the exterior.

Below-Grade Waterproofing Failures: Foundation wall waterproofing deterioration, failed drain systems, and hydrostatic pressure events introducing moisture into below-grade spaces including parking structures, mechanical rooms, and occupied basement levels.

HVAC Condensate and Vapor Intrusion: Improperly designed or maintained HVAC systems introducing condensation into ceiling cavities and wall assemblies, creating chronic low-level moisture conditions that accumulate over time.

Envelope failure investigations require a different approach than acute water event documentation. The source of intrusion is often not obvious, and establishing causation — critical for insurance claims and construction defect cases — requires systematic analysis.

CDS envelope failure investigations typically include:

Building Envelope Survey: Systematic visual inspection of the exterior face for evidence of deficiencies, damage, or prior repairs that may indicate failure locations.

Interior Thermal Imaging: FLIR scans of all interior surfaces adjacent to the envelope, conducted under appropriate temperature differential conditions to maximize anomaly detection.

Moisture Mapping: Systematic moisture readings mapped to floor plans to characterize the distribution and severity of moisture across affected assemblies.

Source Identification: Analysis of thermal and moisture data to identify likely entry points and migration pathways, with recommendations for invasive investigation (exploratory openings) where source confirmation requires it.

Reporting: Comprehensive documentation report identifying affected areas, probable entry points, affected materials, and recommended remediation scope.

Envelope failure claims are among the most frequently disputed in commercial property insurance. The chronic nature of many envelope failures raises questions about maintenance exclusions, pre-existing conditions, and the distinction between sudden-and-accidental and long-term water intrusion. CDS documentation addresses these questions directly: our reports include analysis of moisture distribution patterns that can help distinguish acute from chronic intrusion, and our findings are presented in a format designed for use in appraisal, mediation, and litigation contexts.

Building envelope failure investigations require specialized expertise in building science, moisture dynamics, and claims documentation. CDS brings all three to every engagement. Contact us at (303) 242-6361 or through our website to discuss your project.