Will my garage floor hold a motorhome ?help

[luberhill]

Ok my pole barn has a 4” slab, 4000 psi concrete with fiber and wire mesh,,,it compacted bankrun gravel and crusher under it
How much does a 29 ft class a or c weigh ??
And is this floor sufficient ?

[joshuajim]

The concrete is 4000 PSI, your tires exert approx 100 PSI. Do the math.

[Cummins12V98]

"compacted bankrun gravel and crusher under it"

^^^^^ This is the key to the concrete supporting even a Class A Motorhome with 4" of concrete.

[westend]

bid_time wrote:
It's not the compressive strength you need to worry about, it's the flexural strength and bearing strength below the slab. Then add in W/C ratio, expansive soils, improper curing, segregation, air content, inadequate compaction, etc. Long and short of it, there is no one here that knows the answer but it sounds like you did everything right; If the installer held up his end you should be ok.

And the bottom line is that it's guaranteed to crack (eventually). I place slab just like you've stated, wire and fiber added to 4K psi. I also use rod if I sense a problem with the fill. Rods tend to keep everything together longer. No one has reported any problems. For a big truck, bus, or RV, I would place it with 5" depth. That doesn't void that original warranty, either.

Good luck with your Class C and the slab, you shouldn't have any probs.

[luberhill]

Not sure, how thick are they ?? And I’m sure they are not on 4 ft of fill

[Bobbo]

Look at the parking pads at any campground. Do you think they are any better?

[WTP-GC]

As a licensed general contractor....I say you're OK. This is not ever something I'd even consider worrying about.

[doxiemom11]

Doesn't seem like the cement slabs you park on in an RV park are thicker than 4". Don't know for sure though.

[luberhill]

Yes the pad was bank run gravel compacted with a big plate compactor everyb10””
It then sat for 5months in rain, snow etc,, there was about 40” of fill in the back.
Then the barn was built and it sat for 3 more months... then graded inside and 2” of crusher and compacted again with plate compactor
Then concrete trucks pulled into my 14 ft overhead door and 4” plus the poly and wire mesh and fiber in the 4000 psi mix,,
I stayed off it for 10 days and then put my car in there. It’s been a month now since piuring

[Dennis12]

Your concrete is only as good as the base under it. By what you are saying you will be OK. I've worked concrete for the past 42 years

[Pangaea_Ron]

Most building codes only allow 1,500 PSF soil bearing without testing.

Assuming an 8"x8" footprint for each tire, which would equate to 16"x16" bearing on the compacted sub-grade, or 1.77 SF for a 4" thick reinforced concrete slab. That would allow for 2,655 pounds per tire, or 15,930 pounds for the motorhome with 6 tires down.

Those numbers are pretty simplistic and include lots of safety factors. Your Class C should be fine.

[Grit_dog]

I'm guessing the barn/slab is pretty new since you know all the details about the slab and guessing it's for the RV to live in?
It is fine. Are you afraid of parking it on the driveway in front of the barn? If it doesn't sink there, it won't sink in the barn.

[DougE]

The concrete is rarely the problem. Concrete fails because the underlying structure is not adequate. It looks like your substructure is good. BTW, the base concrete from a plant is usually 2500 psi. Your MH is probably putting 100 psi to the ground.

[Bill_S_1]

luberhill wrote:
Humm mixed answers ,, curious as how many are parking on 4” slabs

Even if everyone here parked on a 4" slab, with some saying it's fine and others saying it's not, the poll doesn't tell what we need to know. How was the base prepared, and how tight is it? That's what matters.

I have a friend who owns a business where heavy tractor-trailer tankers and flat-beds with equipment on them, come in and out of his gate, every day. The entrance was 20' wide and probably 50' or more feet in, before it met a paved lot. The trucks kicked up a lot of dust, all day every day. So he decided to concrete that area, and I was there when they did it. They poured 2" over the stone. Yes, that's all. I asked him how long he thought that was going to last, since the truck weight would break it up into pieces, in no time. And that's when he told me what I am telling you.

That stone base he poured over, was so tight that it never rutted, even in the rain, with all the heavy truck traffic. I watched for cracks in that concrete for years. It didn't.

If YOUR pad is prepped right, and is properly compacted, your floor will hold whatever you park on it. If it wasn't, it will probably crack from the weight of your car. Either way, if it's already there, I wouldn't worry about it now. Just use it.

[midnightsadie]

me, no problem third rv on this slab. inside a pole bldg.

[luberhill]

Humm mixed answers ,, curious as how many are parking on 4” slabs