Jacking Main Beam/floor Joists - Building & Construction - DIY Chatroom Home Improvement Forum


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

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

Reply
 
Thread Tools Display Modes
Old 05-30-2007, 08:14 AM   #1
Mechanical Engineer
 
Join Date: May 2007
Location: Akron, OH
Posts: 102
Rewards Points: 75
Default

Jacking main beam/floor joists


Hi Guys, newbie (to the forum) here, and I'm working on renovating an older house (1920). The main beam was built to span a 25'x30' foundation lengthwise (roughly). Floor joists were cut with a tonge on the end where they tied into the main beam, and they rest on a rough cut 2x4 ledge. Floor joists have cracked along the tongue and caused the floor to sag. I'm in the process of gutting all the walls (plaster and lath). Once complete, I plan to support the main beam with lally columns and jack each joist back into place, then support with joist hangers. Currently the main beam has jack-posts supporting it. Any suggestions for the best way to make footings for the lally colums? Also, any pitfalls I should look out for in supporting the floor joists? Thanks.

Advertisement

gshock is offline   Reply With Quote
Old 05-30-2007, 09:17 AM   #2
Lic. Builder/GC/Remodeler
 
AtlanticWBConst.'s Avatar
 
Join Date: May 2006
Location: New England
Posts: 7,556
Rewards Points: 2,000
Default

Jacking main beam/floor joists


Quote:
Originally Posted by gshock View Post
.... Any suggestions for the best way to make footings for the lally colums?
Hi,
The kind of soil that is under the area has an impact on the size and depth of your footings. Thus, you could go minimum size of 1'-0" down x 2'-0" square or you could go 3'-0" x 3'-0" square or more. You should look into this and check with your town or a soil engineer.

Quote:
Originally Posted by gshock View Post
....Also, any pitfalls I should look out for in supporting the floor joists? Thanks.
None, off the top of my head. This is really factored by what can be visually seen and inspected - on site.
Tips: When jacking, go S-L-O-W-L-Y and listen for any unusual noises; cracks, pops, etc. You are not just jacking up that floor, you will be jacking up everything above that beam, including the 2nd/3rd floors if you have these. If you have any ceramic tile floors above the area, they will end up cracking as you raise the beam and the joists attached to it. If the joists are attached onto the sides of the main carrying beam (as opposed to sitting on top of it) I would advise that you attach your joist hangers prior to jacking as the joists WILL pull away from the beam once you start jacking it up.

Ultimately, I would suggest that you have someone knowledgable about structural design out to your house to inspect the area and review what your plan is....just to make sure that you are not missing something.

FWIW-If we are in a complex remodel or need to make a complex design change, I ALWAYS get a 2nd or 3rd review from an experienced fellow GC or engineer, before undertaking any major structural mods/changes.

Advertisement

__________________
- Build Well -

Last edited by AtlanticWBConst.; 05-30-2007 at 09:20 AM. Reason: spelling
AtlanticWBConst. is offline   Reply With Quote
Reply


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
This doesnt seem right. JoulesWinfield Electrical 27 07-26-2009 08:40 PM
Main Service Panel Full bobo Electrical 5 09-24-2007 08:13 PM
Main disconnect breaker coyote556 Electrical 9 08-01-2007 05:52 AM
Sewer gas smell in basement when doing laundry on main floor Bornintc Plumbing 1 01-17-2007 12:04 PM
Arced main lug in service panel burgeke Electrical 4 11-02-2006 12:28 PM




Top of Page | View New Posts