Vident Partners provides vetted windows and frames expert witnesses for cases involving water intrusion, window installation, storm damage, safety glazing, door and window product defects and code compliance. Request a referral today.
Find a Windows & Frames Expert →Overview
A windows and frames expert decides why a window or door opening leaked, broke or failed: whether the product, the installation or the wall around it was at fault, and whether it met the code and the specification. Windows are holes in a building's water barrier, so a small flashing error can rot a wall for years before anyone sees it. This page covers windows, doors and their framing. Wall assemblies generally belong to a construction defect expert, mold to a mold expert, and hurricane forces on the whole building to a structural engineer.
The expert reads plans, product submittals, window labels, installation instructions, inspection records, repair invoices, moisture readings and photographs. Water testing, done with care, is often the turning point: it can show where water gets in and how far it travels.
The Department of Energy's building science guidance says windows and doors disrupt a wall's water protection layer and present spots vulnerable to leakage, and that properly installed flashing is crucial to stop water intrusion 1. It calls for properly lapped flashing around openings to direct water 1. Those sentences describe most of the fight. Was the flashing lapped so that water drains out? Was the sill pan present? Did the installer follow the maker's instructions and the stucco or siding details? Investigators open the wall at a few chosen locations and record each layer before it is lost.
Blame often spreads among parties. The window maker points to the installer, the installer to the framer or stucco trade, and the owner to the builder. So the expert should tie each leak to a specific cause, and test more than one opening. Whether leaks at a few openings can be extended to a whole building is a common dispute, and that calls for a stated sampling method.
In hurricane regions, failure can start at a window. The 2018 International Building Code, as FEMA's compilation sets it out, requires that glazed openings within 30 feet of grade meet the large missile test of ASTM E 1996 in the relevant regions 2. FEMA's handbook for public facilities suggests installing windows in stronger frames with secure attachment to the wall framing, replacing glass with impact-resistant glazing, or using storm shutters, and says to install only shutters labeled as tested and code compliant 3. In a loss, the expert asks what was required when the building was permitted, what was installed and whether a window failed by pressure or by debris. Labels and permit records can answer much of that.
Glass injuries raise a federal rule. CPSC's standard on architectural glazing materials applies to storm doors, doors, bathtub and shower enclosures, and sliding glass doors 4. It describes the injuries it addresses, including walking or running into glazed doors believed to be open 4. Building codes separately require safety glass in hazardous locations. In an injury case, the expert looks for the permanent marking on the glass, and for whether the glass in the door or panel was the original product or a later replacement.
Class actions and warranty suits often allege that a line of windows lets in water, or that seals fail early. The expert tests units, reads warranty terms and compares failure data with the maker's records. A rating on a label shows how a sample performed in a lab, and field performance depends on installation.
Look for an engineer or building envelope consultant with direct experience in testing and investigating windows, or a senior installer or manufacturer's field engineer for practice questions. Ask what field test methods the expert uses, and whether results can be repeated. Each opinion must stay within what the method supports 5. Pair this expert with a construction defect expert on the wider wall assembly and with a mold expert on any health claims.
The Department of Energy's building science guidance says windows and doors disrupt a wall's water protection layer and present spots that are vulnerable to leakage.
Case Types
Water intrusion around windows and doors
Failed flashing and installation defects
Hurricane and wind damage to openings
Safety glazing injuries
Product class actions and warranty claims
Sliding glass door failures
Replacement window installation disputes
Mold damage traced to window leaks
Qualifications
Related Specialties
FAQ
Look for an engineer or building envelope consultant with direct testing experience, or a senior installer for practice questions. Ask what test methods are used and whether results can be repeated.
Often it is the flashing, sill or installation, and not the product itself. The expert tests the opening and traces where water enters.
Sometimes, with a stated sampling method. Whether results can be extended is a common dispute.
FEMA's compilation of the 2018 IBC says glazed openings within 30 feet of grade must meet the large missile test of ASTM E 1996 in the relevant regions. The code in force at permit controls.
Look for the permanent marking, and check whether the panel is original. CPSC's standard covers products such as storm doors, sliding glass doors and shower enclosures.
In general, windows and frames expert fees are determined by the expert themselves, based on a variety of criteria. Among those criteria are experience, the number of openings, field testing needs, travel and the amount of testimony. Vident does have some influence over expert fees by comparing experts within a specialty, but ultimately it is a personal decision by the expert.
Sources
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