I am a roof truss manufacturer from Illinois. We deal with these drywall crack issues every year. My guess is the cold weather we had here in the Villages a month ago had a lot to do with these drywall cracks appearing. When the bottom chord of the trusses are insulated and warm and the top chords and webs are not during an extreme temperature change they will expand and contract therefore causing drywall cracks at the weakest point. The reason these cracks appear along the seams every 4 feet is not due to bad tape, its due to 2nd or 3rd coats of mud being applied to soon in high humidity. If you do some research on USG drywall installation you will find that in high humidity you should not apply an additional coat of mud to a joint for 2-3 days. My best guess is due to the limited time frame these contractors have, that procedure was not practiced.
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