Upgrade To Garage Joists - General DIY Discussions - DIY Chatroom Home Improvement Forum

Go Back   DIY Chatroom Home Improvement Forum > DIY Forum > General DIY Discussions


Thread Tools Display Modes
Old 05-19-2009, 11:50 AM   #1
Join Date: May 2009
Posts: 2
Rewards Points: 10

Upgrade to garage joists

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 2x8s 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.



kirkl is offline   Reply With Quote
Old 05-19-2009, 12:07 PM   #2
Builder and Remodeler
JohnCarpenter's Avatar
Join Date: May 2009
Location: Dallas, TX
Posts: 34
Rewards Points: 25

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.


JohnCarpenter is offline   Reply With Quote
Old 05-19-2009, 12:26 PM   #3
Registered User
Join Date: Mar 2009
Posts: 11,730
Rewards Points: 526

As John said sawn lumber won't work. You could build a floor for storage only with I - joists and plywood deck. If headroom, build it below the roof/wall connection, depends on garage door opener hardware.

Here is info, notice the on center chart below for different spacing (cheaper):


Be safe, G
Gary in WA is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
garage loft; ledger to ledger joists? nsixbdg Building & Construction 10 12-26-2011 06:29 PM
garage ceiling joists josh123 Carpentry 6 07-14-2009 11:07 PM
Garage ceiling and attic storage DIY KEN Building & Construction 7 01-06-2009 04:57 PM
Question about ceiling joists in a garage allpraisebob Carpentry 11 12-14-2006 08:00 AM
Broken garage joists RBoncelet Carpentry 5 11-05-2006 12:55 AM

Top of Page | View New Posts


Search Engine Friendly URLs by vBSEO 3.6.1