Quote:
Originally Posted by jrref
Your home seems to be the exception. Almost every home I've been in has minor cracking in the garage and lanai ceiling. Most of the time it's because the ceiling super heats in the summer months. Lori who owns "A Touch of Drywall", who specializes in drywall repair here in the Villages will not repair your garage or Lani ceiling unless you have insulation because of the heatng problems causing cracks. Now, it's possible some homes may be oriented so the garage and lanai are not in the hot sun during the hottest parts of the day which may be the reason why some don't crack.
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I don't know what you mean by "super heat", but, from a scientific heat transfer basis, the ceiling in an unconditioned space will be the same temperature whether it is insulated or not. If the attic heats up very quickly, the insulation may slow down the transfer of heat, but within an hour or so, the temperature above and below the drywall ceiling will reach an equilibrium status and they will become the same temperature. This assumes that you measure the actual temperature of the drywall. So, I don't think the insulation will have much effect, if any, on the tendency for the drywall to crack. The building industry has a long standing policy that you insulate between conditioned and unconditioned spaces, but that you do not insulate between two unconditioned spaces.