Leveling Joists In Crawl Space - Building & Construction - DIY Chatroom Home Improvement Forum

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


Thread Tools Display Modes
Old 03-15-2014, 07:25 PM   #1
Join Date: Jan 2014
Location: Indiana - US
Posts: 32
Rewards Points: 29

Leveling joists in crawl space

Currently are living room floor has a slight sag near the wall. After having a structural engineer look at the problem its deflection on the joist do to load. Based on specs from the SE I built 3 2/12 to make a big beam to put in the middle of the sag to hopefully eliminate it. My question is what the best way to level the floor in crawl space? I was thinking about pulling string across all joist get that level then measure up from the string to the joist to find the on even joist. Thoughts or suggestions ?


zero80 is offline   Reply With Quote
Old 03-16-2014, 07:52 AM   #2
Join Date: Apr 2012
Location: UK
Posts: 714
Rewards Points: 502

If the SE has sized you a beam, he should at least advise on a method of levelling the joists - if that is actually possible.
If it's an older house, and the sag has been caused by the long-term loading of a wall, it's possible the joists may be permanently bowed because timber undergoes long-term creep deformation under load. If you then try to level it - eg by jacking - it may lift or put stress on other parts.


tony.g is offline   Reply With Quote
The Following User Says Thank You to tony.g For This Useful Post:
JustinK (03-16-2014)
Old 03-16-2014, 09:37 AM   #3
Join Date: Jan 2012
Location: Pacific North west
Posts: 1,311
Rewards Points: 626

the best way I can think of it place that beam use a steel I beam and place it. when you jack it up slowly look for day light between the joists and beam shim accordingly so that it is equally distributed. also you may have to shim between the floor and the joists as well. given that you have a reverse action going on. so go slow take your time it should come out just fine.
Nailbags is offline   Reply With Quote
Old 03-17-2014, 02:39 AM   #4
Join Date: Jun 2009
Location: atl & hilton head
Posts: 4,607
Rewards Points: 4,796

screw jacks ONLY,,, hydraulics are too fast & uncontrollable imn-s-hfo so what if it takes a while to fix it ? it probably took longer for the damage to occur
stadry is offline   Reply With Quote
Old 03-17-2014, 07:56 AM   #5
Join Date: Jan 2014
Location: Indiana - US
Posts: 32
Rewards Points: 29

The beam already in place. I am using screw jacks three feet apart sitting on top of 2ft 2/12. I am guessing the string idea is the best to go with.
zero80 is offline   Reply With Quote
Old 03-18-2014, 09:57 PM   #6
Registered User
Join Date: Mar 2009
Posts: 11,730
Rewards Points: 526

The string line will sag, unless nylon and pulled extremely tight. When stringing for level, I add a second nail in front/diagonally across the string nail because I reef so hard on the string- one nail can pull out. Optimum; rent a laser level, second choice- string line. Even with nylon and a good pull, it will sag 1/8" in 25'. After attaching one end, make a loop for the other nail head by twisting the loop 3-4 times before putting it over the nail. With one hand pulling the string slack while other is pulling the slack end (past the nail)-- the string will tighten and stay there because of the twists you put in (with a little movement of hand/string back toward the nail- at right angle from- while keeping the tension). Add a final couple of winds around the string at the head to keep it there-- when tight enough (when you grab the taut string and it won't pull any tighter without hurting your hand).



If any ads are present below my answer or words underlined/colored, I do not condone/support/use the product or services listed/linked to, they are there without my consent.
17,000 dryer fires a year, when did you last clean the inside of the dryer near motor or the exhaust ducting?
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
Insulating my crawl space jimmyfloyd Insulation 2 11-10-2012 04:17 PM
Crawl Space Insulation in NWT Canada too-cold Insulation 3 11-10-2012 02:11 PM
Air Barrier in crawl space biglurr54 Insulation 6 01-15-2012 08:50 AM
Crawl Space Questions mark2741 Building & Construction 1 12-23-2011 11:20 PM
Open crawl space to heated basement benjamincall HVAC 1 03-04-2011 07:52 PM

Top of Page | View New Posts


Search Engine Friendly URLs by vBSEO 3.6.1