How to raise a sagging floor using floor jack or screw jack and hydraulic jack

Old house renovation often involves sagging floors. There are a number of potential solutions to raise sagging floors that are no longer level.
To find actual level we used a laser level ( found on Amazon:
DEWALT Line Laser, Self-Leveling, Red, 3-Beam (DW089K)
by Dewalt

A similar less costly laser level is :
KAIWEETS Self-Leveling Green Laser Level, 360 Laser Line with 2 Plumb Dots, Cross Line 197ft with 7800mAh Rechargeable Batteries & Magnetic Rotating Stand for Construction and Picture Hanging
by KAIWEETS

In this case we opted to use screw jacks or floor jacks plus a hydraulic jack here and there to do the heavy lifting..
The floor jacks we used to raise the sagging floor were:
Akron Heavy Duty:
12 ton bottle jack:
OR
We also use a Stanley 6 foot level:
We built a temporary wall in the basement before removing the rusty screw jack and putting in a series of new floor jacks.
The jacks were raised 1-1.5 turns ( or about an eighth of an inch ) every other day or so till we had reach out desired height of around 1 inch.
Sagging floor repair requires professional consultation with a structural engineer to do it correctly and safely. It also requires patience. In our case this old house we are renovating took over 100 years to develop sagging and unlevel floors. So jacking up those beams to raise the sagging floor is a slow deliberate process.

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[Housebarons]

We can not stress enough the VALUE of having a laser level when doing this kind of work (or even checking the condition of the floors )!
If you are interested, check out the link :
DEWALT Line Laser, Self-Leveling, Red, 3-Beam (DW089K)
by Dewalt
It works well but this is NOT the most affordable version. We actually have 3 different brands and they ALL work great. If you are looking for more affordable options, check out the video description or our other floor leveling videos in the following playlist :
Just FYI. These Amazon links are affiliate links. They are free for you to use AND Amazon will pay us a small commission if you use them - Many thanks if you do. It helps us keep making videos!

[robertsonplantwalls]

This is awesome. Those posts are only meant to be temporary and emergency fixes. I believe you need at least 10" deep 20"x20" concrete pad under posts as well. Ground doesnt resist force as well as concrete does, so you need to spread that force out onto a wide footing or else these temporary posts will crack the original concrete floor and the sagging starts all over again.

[mattgrizz]

I just bought almost 100 year old house and this is exactly what my floors are doing. Best video on YouTube I’ve found yet! Thanks

[ragtie]

Just bought (stole it) an 1890 house and this video will guide us to leveling our 4 level home. Thank you, excellent work

[brendanking]

i always wondered how this was done. Good job guys.

[knowledgeuntamed]

Thank you. Video helped some. Really could use some Advice on jacking up the floor where the fridge pulled it down an inch.

[chitownbangin]

The "Yeauh" at 7:30...we all know that feeling boys, when you survived an entire house not falling on you.

[zetamale]

Good video.
My grandmothers house was built in the 1800's. It sagged bad in the center, probably 3" or so over a 10' span. The foundation was made of stones around 12" cemented together. That was a scary 2 story house. After it was sold, it sat empty for years then the owners tore it down. Just my 2 cents.

[firstmkb]

Thanks for posting this! I have a cracked joist due to a knothole, conveniently placed behind ductwork and wiring runs.

After seeing what you had going on, I feel blessed!

[alecharper]

I am doing a similar project in an 1830s house. Replacing rusted Lally poles with new "Big Mos" as I see you are using (now 4" vs. 3"; rated up to 38k lbs). Using a laser and worksheet from certain points. Also, poured 1/2" rebar-reinforced footers that are 2' square and 15" deep. Planning to lift floors slowly, adjusting all poles in sequence, once per week until level. Already see a difference. Much more work to do to remediate water intrusion through rubble stone foundation. Geez..., once this work in the cellar is complete, I can focus on the fun projects.

[anishamm]

Nice video. Verey detailed without becoming boring! Thanks (I'll try something similar but in my scrawl space)

[sergioecg]

leverage is a hell of a thing, get some big pipe round that wrench bro! so much easier! good luck with the project, thanks for the vid it was helpful.

[dgriffin]

"It needs a little work". Hahaha, ; and Joe B. Captain of the sinking Ship of State said, "Don't worry folks, we're just stopping for ice".

[stephanielacy]

this video has been real helpful to us and we will be referring to it when leveling our fixer. thanks.

[margiemarks]

Thank you so much I so appreciate your opinion. Your great!

[beardedgaming]

i just got a 125 year old house. my floors are not quite as bad as yours but previous contractors have cut through many of the joists in the basement. others are notched MANY inches to fit old Hvac ducting. the wood support pillars are rotted on the bottom from water and have collapsed. wood being so expensive right now i was considering welding some 2x3 3/8 channeling and using a bottle jack to start propping up. then using some 1/4 steel plate to weld gusset hangers onto the existing support beams and adding some new 4x4 wood to replace the old pillars.

[forrealtyler]

Great video! The music sounds like I'm in a crash bandicoot game🤣

[prettypurses]

This for responding so quickly..my problem I think is with the sisteted beam that is being push out of square on bottom that I can see.. I agree I probably need an engineer to diagnose problem but I'm kinda scared to deal with those people.. they seem to think you have a lot of money which I dont.. again thanks for your help...

[paperplatemask]

My current home is 100yrs old and this is what im going through. My next house will not have a basment.

[cwhite]

This was awesome to watch, great video! Thank you for sharing. Question, when you install these beams and use the hydraulic to lift the floor are there any risk of cracking the surrounding walls or trim?