I have a ceiling with 24 OC trusses. The ceiling was covered with 1/2 inch drywall. It was fastened with screws every 12″ along the edge and field. My question is will this eventually sag? Should they have used 5/8″ drywall? I have read some books that say 5/8 is best but 1/2 is fine. Who is correct ? Could someone please give me a little help.
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