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Patio Slider Loss in High Winds
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DWQ is a Mechanical Engineer, Aerospace And Industrial Fastener Specialist, Aerospace Product Development Consultant, Research and Development Consultant with world-class expertise in fasteners, latching mechanisms, aircraft and other vehicle structures, structural analysis, numerical and nonlinear finite element modeling, metals behavior, products liability, personal injury, intellectual property, technical publications, and products liability
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On December 25th 2003 the mountain regions in Southern California were subjected to a mini cat storm with winds reaching over 70 mph in some areas. The winds peaked in the late afternoon and had died off by midnight. Rain was intermittent and winds generally from the South and South-South West.
Sometime before midnight a homeowner in Crestline heard a load noise coming from the second floor and upon investigating found one of the two upstairs sliders had popped out of the framework and was lying on the patio deck. The homeowner jammed the slider back in place but doesn’t believe he got it properly on the tracks. The homeowner could not recall whether the slider was properly installed prior to the storm, as this passageway had been blocked by a sofa since setting up residence.
On December 26th the homeowner contacted the insurance company and filed a claim for water damage resulting from loss of the slider by high winds. Damage claimed included mold and wall and paneling warpage. Shortly afterwards the homeowner left town for two weeks. The water damage claim via the slider loss was eventually denied by the insurance company but in the intervening three+ years mold has developed, precluding occupation by the homeowner and his family. The homeowner ended up filing a bad faith claim against the insurance company for mold damage and living expenses since the loss.
A site inspection was conducted in September 2006 during which several leak paths were noted in both upstairs patio doors. Elastomeric seals were cracked with large pieces missing. Both the elastomeric and felt seals failed to provide coverage for large segments of the periphery of the slider assemblies. The state of the seals had not likely changed much in the intervening period since the loss. The wooden sill support was rotted and the screws attaching the sill to this support rusted and loose to the point that they could be extracted by pulling out of the sill. The slider wheel opposite the door handle was off the track rail, further providing a large leak path for any rains occurring between December 2003 and September 2006. It was not possible to operate the door in this condition and plaintiffs counsel objected to having the slider reset into the frame properly.
The problem with the plaintiff’s claim is that the winds were directed against the slider and would have tended to force the slider into its frame rather then out from it. The Homeowner even asserted that the winds were blowing rain into the house while he attempted to reinsert the slider. A review of weather station data for that date limited the time of loss to between 6:30pm and 8:30 pm (dark, windy AND raining). Engineering analysis of wind forces during this period showed a maximum uplift force of _ lb and an opening force of less than 2 lb. As the house had all windows and doors closed there was no outward force on the slider.
So what caused the damage?
It is not possible that a properly installed slider could have come off given the wind magnitudes and directions on the date of loss. The water damage, including mold and buckling of the paneling, was likely a result of long-term water ingress through the ineffective seals on the upstairs sliders. It should be noted that during the inspection of September 2006 no mold was found near the sliders.
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| Mechanical Engineer, Aerospace And Industrial Fastener Specialist, Aerospace Product Development Consultant, Research and Development Consultant, fasteners, latching mechanisms, aircraft and other vehicle structures, structural analysis, numerical and nonlinear finite element modeling, metals behavior, products liability, personal injury, intellectual property, technical publications, and products liability | |
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Kevin Kennedy & Associates, Inc.
Rapid Response Engineering® Solutions
3905 Vincennes Road, Suite 320
Indianapolis, Indiana 46268
(317) 536-7000 voice
(317) 536-7220 fax