How do I finish my ceiling?

[Tbone 57]

Hello everyone, I am new on the garage journal. I have been just spectating, learning a lot and tell I run across my own garage issues. My garage is 20x20 noticed there are only rafter ties every 4 feet or so, if I want to insulate and sheet rock what do I use going across that span can I use 2 x 12's can they be spliced? I am kind of confused

 

[dirtydrew420]

This is what I did. I'm not an engineer. But they're rigid and I measure the span in 3 places every few months and nothing is moving, even with the weight of snow on the roof. Seems fine in my book.

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[BKB]

most people would tin and blow in insulation

 

[TractorJeff]

Rafter Ties or Ceiling Joists?
Why do you need 2 by 12's?

 

[banjopete]

Are you talking about how to attach to the rafter ties? What's the spacing on the rafters themselves? If they're 16" or 24" you could just add in more ties on the rafters that are missing ties to give you something to fasten your sheeting too. Pretty easy and you could use whatever lumber you wanted assuming the current ties were done properly.

Post a picture, it always helps.

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[Tbone 57]

It is a hipped garage. 24 inch OC. I want to use more storage and went by a span calculator said for the span needed like 2 x 12's to fill in to make 24 Oc. as in the one picture the only support I have is a one one bite nailed from the peak of my hip to right where my motor for my door opener goes it doesn't seem like enough

 

[banjopete]

I'm confused, the original post indicated rafter ties/ceiling joists every 4ft (every other rafter?) or so but rafters are 24" o.c and appears there are joists on every rafter? Maybe I'm seeing things.

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[loganb]

Looks like standard 1960/1970's midwest detached garage site build...my chicago area house I sold this summer had the exact same construction.

For storage usage you're going to have to reframe those joists and get preferably 2x8 joist ties on every rafter. For just enclosing and possibly insulating up there metal liner panel/tin is how I would do it.

This thread is a couple days old and is in the same quandry:

https://www.garagejournal.com/forum/showthread.php?t=470203