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Sliding patio doors and hinged French doors bring their own set of evaluation questions to a property damage claim, distinct from those involved in swinging entry doors or fixed windows. A typical sliding door consists of one fixed panel and one operable panel that travels along a track set into an aluminum, vinyl, or wood sill, with rollers underneath the operable panel and a lock mechanism where the panels meet. Wind-driven hail or debris can strike the glass, the frame, or the screen, and each of these components is evaluated somewhat differently. Because a sliding door often occupies a large portion of an exterior wall, its exposure to a given storm can also depend heavily on which direction the door faces relative to the storm’s approach, which is a factor worth noting alongside the physical damage itself.
Glass in a patio door is almost always tempered for safety reasons, since building codes have required safety glazing in hazardous locations such as doors and nearby windows for decades. Tempered glass that sustains an impact severe enough to compromise it typically shatters into small rounded fragments rather than cracking the way annealed glass would, so impact damage to a patio door’s glazing tends to be more binary in outcome. The frame and track, by contrast, can show dents, bent components, or debris embedded in the track channel without the glass itself being affected at all. Many patio doors are also insulated glass units built with tempered panes, meaning a fogged or hazy appearance between the panes should be evaluated as a possible seal issue separate from any impact damage, using the same distinctions that apply to insulated window glazing generally.
The track is a particularly important component to inspect closely, since a bent or dented track can cause an operable panel to bind or derail even when no other visible damage is present. Track damage from hail is less common than damage to vertical or angled surfaces because a horizontal track at the base of a door generally receives impact at a shallower angle, but it is not impossible, especially on doors facing the direction from which a storm approached. Screens on sliding doors are typically a light aluminum or fiberglass mesh frame that can be torn, dented, or knocked out of its track independently of the door itself.
French doors, with hinged rather than sliding panels, introduce different components to the inspection, including hinges, multi-point locking hardware, and weatherstripping along the meeting stiles. Because these doors often include large expanses of divided or full-view glass, hail damage assessment follows much the same approach used for window glazing, examining impact points, fracture patterns, and consistency with damage found elsewhere on the same elevation.
An appraiser evaluating patio or French door damage relies on physical inspection of the glass, frame, track, hardware, and screen components together with manufacturer specifications where available, in order to reach an independent figure for repair or replacement. Whether a specific component is covered, and under what policy provisions, remains a question for the policy and the parties involved in the claim.
This article is general education about how the appraisal process commonly works. It is not legal advice, and specific procedures can vary by state and policy.
Russ Lis is a working property insurance appraiser and umpire based in Minnesota, serving clients nationwide. Contact Appraisal Resolution.