How many had to cut floor for lift

[ymurf]

When I had my garage build they did a fiber pour instead of rebar steel. So I am going to have to cut out and re pour it with rebar. How many of you have done this? Some threads I have seen cut out two 4x4 cut outs and repoured and some say cut out 4x12 and pour one section. Whats the best way I can get by with?

 

[machsnell]

How thick is your slab?

I haven't had to but i guided a friend to. I would cut out 4 x 4 and excavate min of 12" and excavate under existing slab 12 inches back and dowel into existing slab every 12 inches and throw a few bars in the bottom at 12 to 18 on center and pour it w 3500. Basically double mat rebar.

Overbuilt a bit but won't go anywhere.

Sent from my SM-G900V using Tapatalk

 

[ymurf]

How thick is your slab?

I haven't had to but i guided a friend to. I would cut out 4 x 4 and excavate min of 12" and excavate under existing slab 12 inches back and dowel into existing slab every 12 inches and throw a few bars in the bottom at 12 to 18 on center and pour it w 3500. Basically double mat rebar.

Overbuilt a bit but won't go anywhere.

Sent from my SM-G900V using Tapatalk

It was a 4" pour.

 

[matt_i]

Personally, I think the extra thickness is not because the lift unit pads are going to crush a hole in the concrete.

Its so enough tensile is developed in the anchor bolts' pullout strength so the thing doesn't tip over when loaded non-centrically.

 

[lakeroadster]

Did the manufacturer of your lift specify that rebar was needed in the concrete if you are installing a lift?

 

[ymurf]

Did the manufacturer of your lift specify that rebar was needed in the concrete if you are installing a lift?

I am leaning toward the Maxjax and I do believe it says that.

 

[lakeroadster]

Hmm... you sure? I don't see rebar in their spec's.

http://maxjaxlift.com/faqs/installation.html

Do I need a special floor or foundation to support my lift?

Most residential or commercial foundations are strong enough to support a MaxJax™ lift. The minimum requirements are 2500-3000 PSI 4" thick concrete. Be sure to check your floor on the possibility of it being a post tension slab. In this case contact the building architect before drilling. Visually inspect the site where the lift is to be installed and verify the concrete is in good condition. If your concrete has cracks or other defects, please consult with a certified contractor before proceeding to install the MaxJax™ lift.

 

[USAFpj]

So I am going to have to cut out and re pour it with rebar

Look at what the lift manufacturer requires. 4in, 3000psi, with fiber is adequate in 9 out of 10 installs- depending on the weight rating of the lift, of course.

 

[wantacoe]

I take it you are going with Maxjax because of the height? If you can go with a high lift with the cross brace on top I would think the 4"floor would hold up fine.

 

[dbabicky]

I've got a 9K 2 post lift on 4" 4000 psi fiber with never any problems.

 

[James-W]

I take it you are talking about a 2 post lift as opposed to a 4 post lift.

 

[larry4406]

I hope that those of you cutting slabs are doing so on a "slab on grade" where the sub soil has adequate bearing capacity. Many times structural slabs are poured due to grade issues, poor soils, etc. With a structural slab, the soil underneath is lose, non-compacted, and not suitable for bearing (its only purpose is to be a form for the concrete).

I have built many houses where the garage is backfilled with 7-8' of loose fill with the structural slab on top.

 

[astroracer]

No where do I see rebar is required for a 9 or 10K 2 post hoist. 4", 3000 to 4000 psi concrete is adequate in most instructions.
My 2 post is on 4" 3000psi and has had an Astro Van sitting on it for over two years with no issues.
You are making it too difficult for some reason.
Mark