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Okay, I made a previous post about this and have determined my original plan is no bueno. For light backstory, I've got a 3 car detached garage 40' x 25' with rafters every 4'OC (pictured below). I've been told I can't just hang drywall and insulation on them because of the fear they cannot hold the weight and will bow. I contacted the builder and they do not have LL/DL specs for the build since it was built in 2000.

My newest crazy plan is to install support beams in the center of the rafters that run to the cement garage floor. It would be a bit unconventional because there would be a support pole in the middle of the room every 4 feet, but we think that we will be able to make it work.

If I did this, the plan is to run 2x4 perpendicular to the rafters 16" OC and then hang 1/2" lite drywall and R-30 insulation above that. I've done the weight calculations and it would be adding 2.7 lbs/sqft not counting drywall mud.

Do ya'll think this will work?

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    If you want to do something significant structurally, you'll need a guy to sign off on it. You should probably ask that guy what your options are. That said it appears they only put a rafter on every second roof stud, so you can probably double the number of rafters easily for a start. Its still nice and open, so you probably have lots of options for reinforcing the rafters as well. – K H Apr 11 at 15:03
  • @KH I'm trying to avoid adding rafters and everyone around me has prices to the moon with construction jobs like this. Supply is low, demand is high during this pandemic we are in. That's why I'm thinking about the support beams. – CSarge Apr 11 at 15:16
  • Must your garage have a smooth ceiling? I hope you've considered just insulating and leaving it at that. What I see doesn't look hideous or need to be covered up. You could leave it be until you have the means to do it properly. – K H Apr 11 at 15:28
  • If you add a beam on the center line you can add fewer teleposts in total and that would allow you to add studs on the 2 foot lines in between your current 4 foot lines. That should be enough support for drywall and insulation. You still need to get the appropriate permits and you may need to pay someone to sign off on a plan. – K H Apr 11 at 15:35
  • I live very rural, so to my knowledge permits don't apply. At least people around here don't seem to think you need them on a detached garage not being utilized as living space. – CSarge Apr 11 at 16:03

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