Commercial Water Intrusion Repair and System Restoration for Multi-Family and Commercial Properties

Water intrusion is the most common driver of building envelope failure in the Pacific Northwest. It is also the most misunderstood. The entry point, a failed window seal, a deteriorated flashing detail, a siding joint that has separated, is rarely where the damage is worst. By the time water intrusion becomes visible inside a building, it has typically been moving through the wall assembly for months or years, saturating sheathing, degrading structural members, and creating conditions for mold growth that are not apparent from the surface. Pacific Building Solutions is licensed in Oregon (License #215897) and Washington (License #PACIFBS831MK) and has executed water intrusion repair programs for commercial and multi-family properties throughout the Portland Metro and Southwest Washington region for nearly 30 years.

We do not perform emergency water damage restoration or insurance-claim water mitigation for individual units. Our practice is focused on large-scale, system-level water intrusion repair for multi-family apartment communities, condo associations, HOA-governed properties, and commercial buildings where the failure is a building envelope problem, not an isolated plumbing or weather event. If you are an HOA board, property manager, construction attorney, or owner representative dealing with water intrusion across multiple units or building faces, this is what we do.

Why Water Intrusion in Multi-Family Buildings Is a System Problem, Not a Surface Problem

A single source of water intrusion in a multi-family building rarely stays single. The Pacific Northwest’s sustained wet seasons, wind-driven rain events, and the construction practices common in the 1980s and 1990s produce failure patterns that affect the full building section, not just the visible surface. Understanding why requires understanding how water moves through a wall assembly.

In a properly functioning exterior wall, water that penetrates the outermost cladding layer, siding, stucco, or other cladding is intercepted by a weather-resistive barrier and directed to flashing details that route it back to the exterior. When any element of that system fails, barrier tears, flashing omissions, siding deterioration, or caulk failure at penetrations, water bypasses the drainage plane and enters the structural cavity. Once inside, it saturates wood sheathing, travels along framing members, pools at floor plates, and eventually appears as staining, bubbling paint, soft drywall, or visible mold inside occupied units.

By the time those internal symptoms appear, the scope of repair is almost always larger than the symptoms suggest. Our water intrusion repair process begins with identifying the system-level cause, not just the visible entry point, and scoping repair to address the full extent of the failure.

Water Intrusion

What Our Water Intrusion Repair Process Covers

  1. Envelope System Assessment and Failure Source Identification

    We begin every water intrusion repair scope with a systematic assessment of the building envelope. We identify the failure mechanism (failed flashing, deteriorated weather barrier, cladding system failure, window or door system failure, or penetration failure) and map the full extent of water migration through the wall assembly before scoping any repair work. Assessment findings are documented for property managers, HOA boards, and legal teams as required.

  2. Weather Barrier and Drainage Plane Restoration

    Restoring the weather-resistive barrier and drainage plane is the foundation of durable water intrusion repair. We remove failed cladding, assess the condition of the underlying barrier, replace damaged sheathing, and install new barrier materials in accordance with current installation standards before installing any new cladding. Skipping or shortcutting this step produces repairs that fail again within a few years.

  3. Siding System Replacement and Integration

    Water intrusion repair and siding replacement are almost always the same scope in multi-family buildings with envelope system failures. We replace failed siding systems with James Hardie fiber cement, Cedar, Craneboard, or Stucco/EIFS as appropriate, integrating new siding with restored flashing and barrier systems to produce a complete, warrantable exterior assembly.

Water Intrusion Repair Process

  1. Window and Door System Repair and Replacement

    Window and door system failures are among the most common water intrusion entry points in 1980s and 1990s Pacific Northwest construction. Failed sealants, improper head flashing, missing sill pan flashing, and deteriorated frames all allow water to enter through openings. We repair or replace window and door systems as part of water intrusion scopes, ensuring the new systems are correctly integrated with the restored weather barrier and flashing details.

  2. Flashing System Repair and Replacement

    Flashing failures at roof-to-wall transitions, deck ledgers, window heads, penetrations, and horizontal offsets are the most common single cause of water intrusion in multi-family construction. We identify every failed or missing flashing detail in the assessment phase and replace or install flashing systems as part of the repair scope. Flashing is not an optional upgrade in a water intrusion repair program. It is the repair.

  3. Structural Repair Related to Water Damage

    Sustained water intrusion frequently produces structural compromise at the rim joist, bottom plate, and sheathing level. We assess and repair structural damage as part of water intrusion scopes rather than passing that element to a separate contractor. Splitting structural repair from envelope repair creates gaps in the repair sequence and adds time and coordination overhead that HOA boards and property managers do not need.

  4. Documentation for Legal and Oversight Environments

    Water intrusion in multi-family buildings frequently involves insurance claims, construction defect litigation, or forensic consultant oversight. Our documentation protocols (assessment reports, scope documentation, photo records, and repair verification) are structured to satisfy the requirements of attorney oversight, owner representative review, and insurance documentation from the first day of the project through closeout.

Who Calls Us About Water Intrusion in Multi-Family Buildings

Construction Consultants, Attorneys, HOA Boards

Our water intrusion repair clients are not homeowners dealing with a leak. They are the professionals and institutions responsible for commercial and multi-family properties at scale:

  • HOA boards and condo associations confronting water intrusion across multiple units and facing the question of how to fund, scope, and execute a repair program that protects property values and satisfies reserve study requirements
  • Multi-family property managers managing apartment communities where water intrusion complaints are recurring across multiple units and the surface-level repairs are no longer holding
  • Construction attorneys representing HOA boards or property owners in construction defect litigation where water intrusion is the primary damage claim and a qualified contractor is needed to execute the repair scope under legal oversight
  • Building envelope forensic consultants who have completed their assessment and need a licensed contractor to execute the repair scope they have specified
  • Owner representatives and asset managers overseeing commercial or multi-family portfolios where water intrusion has been identified as a capital risk

Water Intrusion Repair in the Pacific Northwest

The Portland Metro and Southwest Washington region produce specific water intrusion conditions that are worth understanding before scoping any repair program. The region’s sustained wet seasons, typically October through May, produce months of near-continuous low-intensity rainfall that does not overwhelm building envelopes in a single event but sustains moisture pressure against building assemblies for extended periods. This pattern saturates building envelopes with any gap in their weather protection, keeping them wet and allowing biological growth, wood deterioration, and adhesion failure to proceed continuously rather than in isolated events.

Wind-driven rain events, particularly in the Columbia River Gorge corridor and other exposed locations, add directional moisture loading that can force water through building assemblies that would otherwise handle ambient rainfall without failure. Properties in exposed locations, at higher elevations, or near river corridors face a higher risk of water intrusion than sheltered properties in the same region.

Construction practices common in the 1980s and 1990s, the primary era for most of the multi-family housing stock in our service area, frequently omitted or improperly installed weather barriers, flashing systems, and drainage details that are now standard. The repair needs in the Pacific Northwest are not a future risk. It is a present condition across a large portion of the existing multi-family building inventory.

Water Intrusion in Multi-Family Buildings

FAQ: Questions Property Managers, HOA Boards, and Attorneys Ask About Water Intrusion Repair

How is water intrusion repair different from emergency water damage restoration?

Emergency water damage restoration (the service Paul Davis, SERVPRO, and similar companies provide) addresses the immediate effects of a sudden water event: extraction, drying, and dehumidification. It does not address the building envelope failure that allowed the water in. Water intrusion repair, as we practice it, is a construction and envelope remediation service that identifies system-level failures, repairs the building envelope to prevent future water entry, and addresses the structural and material damage caused by the intrusion. These are different services performed by different types of contractors at different points in the response timeline.

Do we need to vacate units during water intrusion repair?

In most cases, no. Our phased scheduling approach is specifically designed for occupied multi-family properties. We sequence work across building faces and unit clusters to minimize disruption to residents while maintaining weather protection for open building sections. Full vacations are rare and are only required when structural compromise creates a safety condition that cannot be managed around occupied units. We discuss phasing requirements with property managers and HOA boards before any work begins.

How do you document water intrusion repair for an insurance claim or construction defect case?

Our documentation process produces a complete record of the assessment findings, scope of work, materials installed, and repair verification from the first day of the project through closeout. We photograph every layer of the building assembly as it is opened, document every repair action, and produce written scope documentation that corresponds to the physical work performed. This documentation is structured to satisfy the requirements of insurance adjusters, construction attorneys, and forensic consultants. We are experienced in working within legal-oversight environments and understand the documentation standards they require.

Can Pacific Building Solutions work alongside our forensic consultant or construction attorney?

Yes. Working alongside forensic consultants and construction attorneys on water intrusion repair scopes is a standard part of our practice. We execute repair programs specified by forensic consultants, work within scopes defined by legal counsel, and provide the documentation and reporting required for attorney-directed projects. We do not define the legal strategy or the forensic assessment. We execute the repair scope as specified by those professionals, within the oversight framework they establish.

What is the typical scope of a multi-family water intrusion repair program?

Scope varies significantly depending on the building’s age, the construction methods used, the failure mechanisms present, and the extent of water migration through the wall assembly. At a minimum, a water intrusion repair program includes: failure source identification; weather barrier assessment and replacement; flashing repair or replacement; siding replacement or reintegration; window and door system repair or replacement where failures are found; structural repair where damage has occurred; and documentation throughout. Programs on larger multi-building communities are typically phased over one or more seasons to manage budget, scheduling, and resident impact.

Is Pacific Building Solutions licensed to perform water intrusion repair in Oregon and Washington?

Yes. We hold Oregon Contractor License #215897 and Washington Contractor License #PACIFBS831MK. Both licenses are active and current. We are fully licensed and insured for commercial and multi-family envelope remediation and water intrusion repair throughout our service area.

Serving SW Washington & Portland Metro

We provide exterior envelope remediation services throughout:

  • Hillsboro, OR

  • Gresham, OR

If you are preparing for a multi-unit or commercial exterior remediation project in SW Washington or the Portland Metro area, we welcome the opportunity to review your scope and discuss coordination.

Contractor Serving Vancouver WA