Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Building & Construction

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 01-04-2010, 11:57 AM   #1
Newbie
 
Join Date: Jan 2010
Posts: 4
Rewards Points: 0
Share |
Question

Rafter Ties on Vaulted Ceiling


I have a 24x 26 garage that i am finishing the upstairs. there are 4 foot side walls on the front and back of the building. The height from floor to peak is 16', and 12' from top plate to peak. (4' walls) the rafter span is 12', and i have used 2x10 for the rafters and 2x6 walls rafters and walls 16" on center. I have installed rafter ties on every rafter of my vaulted ceiling at a height of 8' (floor to ceiling, 4' top plate to ceiling) to prevent wall spreading. My question is,which I have read many places but am not sure if it is relevant to vaulted ceilings, can I double up the rafter ties and bolt them to the rafters then remove 2 of every 3 making them 4 feet on center? Also are the 2x10 rafters strong enough to have the rafter ties 1/3 of the way up with a 70 psf ground snow load? I'm sure it won't collapse but I want it to
code.

http://www.finehomebuilding.com/CMS/...QA01-04_lg.jpg



Last edited by timsgills; 01-04-2010 at 12:51 PM. Reason: adding link to picture.
timsgills is offline   Reply With Quote
Old 01-07-2010, 07:30 AM   #2
Newbie
 
Join Date: Jan 2010
Posts: 4
Rewards Points: 0
Default

Rafter Ties on Vaulted Ceiling


The rafter ties in the bottom 1/3 of the span are good enough to keep the outer walls from spreading, the next thing you have to look for is the weight of the roof is now all on the lower third of the rafter greatly reducing it's span capability. You also have to look at how the pitch effects the snowload (the steeper the pitch the less of an effect the ground snow load has). Anyway, i found out I am good.

It is not a good practice according to the building inspector to double up the rafter ties on one rafter and skip the next two. He told me I needed it on every rafter.

Lesson learned: If you move the rafter ties above the top plate, things get complicated quickly and an engineer should be consulted. In the future I would use a ridge beam or prefabricated scissor trusses for an elevated ceiling.

timsgills is offline   Reply With Quote
Old 01-07-2010, 03:02 PM   #3
Registered User
 
Join Date: Mar 2009
Posts: 9,968
Rewards Points: 0
Default

Rafter Ties on Vaulted Ceiling


Thank you for that follow-up! I'm glad you figured it out with our help. For anyone reading, here is part 1: Scissor truss

Be safe, Gary
__________________
If any ads are present in my answer above, I do not condone/support/use the product or services listed, they are there against my permission.
Gary in WA is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
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
HELP! lighting question for vaulted ceiling pauls General DIY Discussions 5 07-03-2010 04:53 PM
Cutting rafter ties ?? scatkins Building & Construction 23 04-13-2010 03:20 PM
Vaulted Ceiling - (Pictures included) How to do it? peabodyn Remodeling 7 03-29-2009 11:18 AM
Vaulted Ceiling, faux wood beam, ceiling fan? zel Electrical 9 07-13-2007 05:30 PM
Rafter Thrust / Cathedral Ceiling sseeley Carpentry 8 10-06-2005 11:19 AM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.