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The food court skylight trick for finding safe floors
After 3 trips through the old Glendale Galleria annex, I kept slipping on rotted carpet near the fountains, so I started following the sun spots from the skylights instead. The dry, bright zones turned out to mark the concrete slabs that were still solid, while the dark corners held the collapsed sections. Has anyone else used light patterns to map out stable walking paths in these places?
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rileyellis21d ago
Saw a structural engineer mention something similar on a building forum last month, said light patterns often reveal where the frame still carries weight because shadows shift where floors have sagged. That tracks with what you are describing, the sun spots are basically free thermal imaging if you know how to read them. Tried it in a downtown Seattle parking structure after the last quake scare, the bright lanes were the only spots that did not creek under my boots. Dark zones near the stairwells were the worst, felt like walking on a drum skin. Smart trick, wish more people would catch on before the carpet gives out.
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paulw8720d ago
Also worth checking the pattern when it's overcast, not just full sun. Diffuse light softens the contrast so you can catch gradual slope changes that get washed out by harsh shadows. Ended up walking a warehouse floor that way, the sagging sections showed up as broad dim zones instead of sharp lines. Might save you from misreading a harmless shadow for a real problem, which is easy to do with the bright spot method. That grey sky trick works on concrete slabs too, not just carpeted stuff.
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