DIY Home Improvement Forum banner

Upgrade to garage joists

1581 Views 2 Replies 3 Participants Last post by  Gary in WA
I am looking to upgrade the celing joists in my garage for a room conversion.

Currently have 2x4, 48” OC spanning the entire 22’ length of the garage, supported midway with a perpendicular 2x6 on top.

I need to support ceiling drywall and light storage on top.

I am thinking of replacing with 22’ 2x8s, 24” OC (to match up with the 24” OC rafters.) A friend mentioned that I might have trouble getting 2x8’s that long and might want to tie shorter pieces of lumber together to create this span. I am not sure how to do this properly and ensure that these beams still have enough tensile strength for the roof load. Are 22' 2x8s difficult to get?

Looking for recommendations.

1 - 1 of 3 Posts
2x12 can only span 18' with no center support on 16" centers.
You can use 2x8's up to about a 12' span. Use a beam in the middle of the 22' span under the 2x8s'. But I have never seen floor joist anything but 16" centers. This all depends on how your roof is supported though. You will need to actually calculate loads.
1 - 1 of 3 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.