Rafter To TJI Connection - Framing - Contractor Talk

Rafter To TJI Connection

 
Thread Tools Search this Thread Display Modes
Old 07-19-2014, 08:30 AM   #1
New Guy
 
haverhillstreet's Avatar
 
Trade: carpenter
Join Date: Aug 2012
Posts: 22
Rewards Points: 64

Rafter To TJI Connection


Hi: I'm going to be framing a 26'x42' garage and will be using 2x10 rafters running parallel with 26' TJI joists. The rafters will need to sit on top of the joists. Can anyone offer me the correct way to structurally frame this and tie the two together, or direct me to a site that shows the proper detail for making the connection? I've found other rafter to joist type connections but can't seem to find this one.

thanks, Dave
haverhillstreet is offline  

Warning: The topics covered on this site include activities in which there exists the potential for serious injury or death. ContractorTalk.com DOES NOT guarantee the accuracy or completeness of any information contained on this site. Always use proper safety precaution and reference reliable outside sources before attempting any construction or remodeling task!

   

Advertisement

 

Old 07-19-2014, 08:55 AM   #2
Pro
 
TRMolnar's Avatar
 
Trade: Remodeling Contractor
Join Date: Mar 2012
Location: GreaterPhiladelphia
Posts: 358
Rewards Points: 398

Re: Rafter To TJI Connection


Why wouldn't the rafters sit directly on the top plate of the wall?

Advertisement

TRMolnar is offline  
The Following User Says Thank You to TRMolnar For This Useful Post:
CrpntrFrk (07-19-2014)
Old 07-19-2014, 09:18 AM   #3
Want to play a game?
 
CrpntrFrk's Avatar
 
Trade: I do that too!
Join Date: Oct 2008
Location: Globe, Arizona
Posts: 4,522
Rewards Points: 4,196

Re: Rafter To TJI Connection


I wonder why they will not be on the top plate also. But you want to handle it kinda like a floor. TJIs with rim board. Set the rafters on top and make a plywood gusset connecting the two. I would also use a 2x4 rat run on top of the TJIs and notch the rafters at the heel for the 2x4.

Sorry to be negative but this sounds unstable and a whole lot of work to make it stable.
__________________
My tools are always yelling at me cause the wife and kids take up too much room.

Last edited by CrpntrFrk; 07-19-2014 at 09:22 AM.
CrpntrFrk is offline  
Sponsored Links
Advertisement
 
Old 07-19-2014, 11:30 AM   #4
New Guy
 
haverhillstreet's Avatar
 
Trade: carpenter
Join Date: Aug 2012
Posts: 22
Rewards Points: 64

Re: Rafter To TJI Connection


The TGI's would need to be 14-16" tall to span the 26'. They need to meet a minimum dead/live load for 'minimum attic storage'. If the rafters and TJI both sat on the top plate of the wall I'd have to cut out the part of the TJI sticking above the roof plane which would affect it's structural integrity. The TJI manufacturers only show this detail using TJI's as both rafter and joist. I thought it might be easier/better/faster? to have the 2x10 rafter sit on top of the TJI joist but I can't find any detail info.
haverhillstreet is offline  
Old 07-19-2014, 11:45 AM   #5
Pro
 
pappagor's Avatar
 
Trade: general contractor
Join Date: Jan 2008
Location: mn mayo
Posts: 1,307
Rewards Points: 32

Re: Rafter To TJI Connection


weyerhaeuser has want you are looking for search there site
pappagor is offline  
Old 07-19-2014, 11:56 AM   #6
Member
 
Shane O's Avatar
 
Trade: Carpenter
Join Date: Apr 2014
Posts: 80
Rewards Points: 176

Re: Rafter To TJI Connection


Sheath your floor.

Use a 2x6 or 2x4 nailed around the perimeter. Birds mouth your rafters to sit on 2x6.

Use a tji trimmer joist that is 1 1/8" to cap your ends of the tji and install squash blocks beside the joists.

Over that span I'd still use tji blocking at center of span.
Shane O is offline  
The Following 5 Users Say Thank You to Shane O For This Useful Post:
fourcornerhome (07-19-2014), JT Wood (07-19-2014), overanalyze (07-23-2014), ScipioAfricanus (07-19-2014), slowsol (07-19-2014)
Old 07-19-2014, 01:19 PM   #7
I'm The BOSS
 
jaydee's Avatar
 
Trade: builder / remodeler
Join Date: Mar 2014
Location: Spencer, Ma
Posts: 1,904
Rewards Points: 4,733

Re: Rafter To TJI Connection


what do the plans say ?

do you even have plans
__________________
We'll give your home a NEW IMAGE
New Image Construction & Design
New image Construction.com
Facebook
jaydee is offline  
Old 07-19-2014, 01:26 PM   #8
New Guy
 
haverhillstreet's Avatar
 
Trade: carpenter
Join Date: Aug 2012
Posts: 22
Rewards Points: 64

Re: Rafter To TJI Connection


Pappagor: Thanks, I'll look at the Weyerhaeuser site.

Shane: That all sounds good. I'm also worried about uplift with this detail, so will probably gusset rafter to joist as Crpntrfrk said.
haverhillstreet is offline  
Old 07-19-2014, 01:42 PM   #9
Member
 
Shane O's Avatar
 
Trade: Carpenter
Join Date: Apr 2014
Posts: 80
Rewards Points: 176

Re: Rafter To TJI Connection


Use a hurricane tie or twist strap from tji to wall and from rafter to trimmer joist. Or an a35 clip from rafter to 2x6.

Also if you set your trimmer joist flush to framing you can sheath up the trimmer joist and that act as a strong connection from floor to walls.
Shane O is offline  
Old 07-19-2014, 02:35 PM   #10
Pro
 
owattabuilder's Avatar
 
Trade: general
Join Date: Sep 2013
Location: Owatonna, MN
Posts: 132
Rewards Points: 278

Re: Rafter To TJI Connection


I would follow Shane O's advice. That sounds like the way I would do it.
owattabuilder is offline  
The Following User Says Thank You to owattabuilder For This Useful Post:
slowsol (07-19-2014)
Old 07-19-2014, 05:42 PM   #11
KemoSabe
 
loneframer's Avatar
 
Trade: residential framing/siding/general carpentry
Join Date: Feb 2009
Location: Vineland, New Jersey
Posts: 14,233
Rewards Points: 12,218

Re: Rafter To TJI Connection


Just did a floor/roof detail like this.

Frame as a floor, using rim board. Deck as a floor to tie everything together. Install a bearing plate of 2x4 or 2x6 and birdsmouth the rafter. Wall sheathing should carry across the rim board and tie to the bearing plate to unify the structure. Use a hurricane clip at every rafter to resist uplift. Install clips to exterior to catch full meat of rafter and tie into the sheathed structure.
__________________
__________________________________




"Walking the fine line between production and perfection"




__________________________________
loneframer is offline  
Old 07-19-2014, 06:16 PM   #12
New Guy
 
haverhillstreet's Avatar
 
Trade: carpenter
Join Date: Aug 2012
Posts: 22
Rewards Points: 64

Re: Rafter To TJI Connection


loneframer: Did you use squash blocks on either side of the TJI's under the bearing plate or did you feel like the rim board with sheathing was enough to support the rafters?
haverhillstreet is offline  
Old 07-19-2014, 07:50 PM   #13
Member
 
Shane O's Avatar
 
Trade: Carpenter
Join Date: Apr 2014
Posts: 80
Rewards Points: 176

Re: Rafter To TJI Connection


Squash blocks are required at all bearing surfaces. There will be a installation guide delivered with your joists. It will show you how to install as well as typical details for bearing.
Shane O is offline  
The Following User Says Thank You to Shane O For This Useful Post:
slowsol (07-19-2014)
Old 07-19-2014, 10:08 PM   #14
Want to play a game?
 
CrpntrFrk's Avatar
 
Trade: I do that too!
Join Date: Oct 2008
Location: Globe, Arizona
Posts: 4,522
Rewards Points: 4,196

Re: Rafter To TJI Connection


Shane O and Lone worded it better but what they have typed out was exactly what I was suggesting.
__________________
My tools are always yelling at me cause the wife and kids take up too much room.
CrpntrFrk is offline  
Old 07-19-2014, 10:33 PM   #15
Pro
 
owattabuilder's Avatar
 
Trade: general
Join Date: Sep 2013
Location: Owatonna, MN
Posts: 132
Rewards Points: 278

Re: Rafter To TJI Connection


Quote:
Originally Posted by haverhillstreet View Post
loneframer: Did you use squash blocks on either side of the TJI's under the bearing plate or did you feel like the rim board with sheathing was enough to support the rafters?

The rim should be good for about 3000 lb / lf load on it it would be the same as the edge of a conventional floor and no blocks required unless the loads are over that.
owattabuilder is offline  
Old 07-19-2014, 10:58 PM   #16
Member
 
Shane O's Avatar
 
Trade: Carpenter
Join Date: Apr 2014
Posts: 80
Rewards Points: 176

Re: Rafter To TJI Connection


Quote:
Originally Posted by CrpntrFrk
Shane O and Lone worded it better but what they have typed out was exactly what I was suggesting.
I agree with this post.
Shane O is offline  
Old 07-19-2014, 11:44 PM   #17
Designer/Contractor
 
Rio's Avatar
 
Trade: General Contractor
Join Date: Oct 2009
Location: San Diego city/County, Cali
Posts: 3,473
Rewards Points: 62

Re: Rafter To TJI Connection


LVL or Microllam rim.............
Rio is offline  
Old 07-19-2014, 11:59 PM   #18
diplomat
 
Golden view's Avatar
 
Trade: Yeah, well, that's just, like, your opinion, man
Join Date: Feb 2012
Location: PDX
Posts: 5,292
Rewards Points: 1,550

Re: Rafter To TJI Connection


Why all the recommendations to birdsmouth over a 2x6? If the rrs align with the cjs, it's not doing anything, except maybe distributing a little load to the rim joist. I'd be fairly concerned though about the rafter-cj connection to resist outward thrust. Check the code tables, you could need 10-20 16D nails here depending on slope and snow load.
__________________
You make something idiot proof and the world invents a better idiot.
Golden view is offline  
Old 07-20-2014, 05:02 AM   #19
Pro
 
Matt0034's Avatar
 
Trade: General Contractor
Join Date: Jul 2014
Location: Huntingdon, PA
Posts: 169
Rewards Points: 344

Re: Rafter To TJI Connection


http://www.buildgp.com/DocumentViewe...elementid=4372. Go to page 7, it shows the connection you need, you'll have to sheath before you put rafters on though. You can bevel cut the top of the I joist, just not past the inside of exterior wall.


Sent from my iPod touch using Tapatalk
Matt0034 is offline  
Old 07-20-2014, 06:40 AM   #20
New Guy
 
haverhillstreet's Avatar
 
Trade: carpenter
Join Date: Aug 2012
Posts: 22
Rewards Points: 64

Re: Rafter To TJI Connection


The site from Matt0034 was the best I've seen for detailed info.

Knowing my building inspector, he'll want squash blocks irregardless .

I wasn't planning on sheathing the entire attic floor, but it looks like I'll have to in order to achieve the proper rating.

Thanks for all your input. I'm a 'finish'guy, not a framer, and have not done this particular detail before. The way the codes constantly change I wanted to get it right.

Dave

Advertisement

haverhillstreet is offline  


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

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
Dormer Shed Roof, Barrel Roof, CutIn Dormer, Eyebrow Dormer sbebuilders Framing 33 04-18-2013 05:29 PM
Common Rafter Length - SpreadSheet Texas Wax Framing 11 12-25-2012 01:01 AM
weird water heater tank connection?... BuenaHomes Plumbing 28 10-02-2012 04:33 PM
cutting multiple precise plumb slots in rafter peakecg Finish Carpentry 15 08-17-2012 11:08 AM
CAT3 for high speed credit card connection KennMacMoragh Low Voltage 13 06-03-2011 12:19 PM

Join Now... It's Fast and FREE!

I am a professional contractor
I am a DIY Homeowner
Drywall Talk is for
PROFESSIONAL CONTRACTORS ONLY!

At DrywallTalk.com we cater exlusivly to professional contractors who make their living as a contractor. Knowing that many homeowners and DIYers are looking for a community to call home, we've created www.DIYChatroom.com DIY Chatroom is full of helpful advices and perfect for DIY homeowners.

Redirecing in 10 seconds
No Thanks
terms of service

Already Have an Account?