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I have an old two bay garage that's 28'x50', that I would like to convert into a home. One thing I'm trying to figure out is how to do the ceiling. The ceiling is held up by metal joists approximately 12" high. The ceilings are 13' high and I would like to drywall them. I plan on spray foaming the roof prior to installing drywall. The bottom of the joists have a gap where I could run a bolt or toggle type fastener through. What should I use for studding and spacing?

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spacing would likely be 16" OC. As for what to use for strapping (studs are for walls) it would depend on the spacing between joists. –  DA01 Feb 17 at 23:10
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Do you have a picture and what exactly do you want to do with the garage? Also are you sure that the framing meets local building codes? (In my area the code for garage and house are very different) –  DMoore Feb 18 at 0:30
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what is the spacing of the metal girders? –  shirlock homes Feb 18 at 7:09
    
Is there a support beam in the middle? The roof may not be able to support the weight of drywall ceiling. Drywall would add over 2,500lbs to roof. –  Justin K Feb 18 at 17:41
    
If it was me I would add a suspended ceiling tiles or create a drop ceiling. Supported by ledgers around whole exterior of building and interior walls. You will have to do load calculations to find out what size ceiling joists you need for your spans. 2x6 2x8 2x10. I would drop ceilings in bedrooms and bathrooms to 8'. This will create an attic space, save on heat, allow for much cheaper fiberglass insulation which will probably pay for all the extra lumber needed. I dont know where you live but spray foaming r36 value over 1,500sf will cost many thousands of dollars –  Justin K Feb 18 at 17:59

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