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Old 12-10-2018, 05:44 PM   #1
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Driveway thickness for RV

Our builder is just about ready to start constructing a driveway to support our DS4018. I have told him it needs to handle 50,000 lbs.

Any engineers out there or concrete contractors that can
share specs. to handle this kind of
weight. We live in the Texas Hill Country, very rocky soil conditions.
Interested in thoughts on base,
rerod size, placement and concrete depth?

Appreciate if anyone has experience with this.
Thanks!
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Old 12-10-2018, 05:48 PM   #2
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Why don't you ask the sub who is going to pour your driveway?
He should know all the weight capacities of the various mixes of concrete.
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Old 12-10-2018, 05:56 PM   #3
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I will not know the sub. till they show up. I just want to make sure
they spec. it right.
I asked they builder for the engineering companies spec’s and waiting for them.
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Old 12-10-2018, 06:00 PM   #4
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Quote:
Originally Posted by Granite17 View Post
Our builder is just about ready to start constructing a driveway to support our DS4018. I have told him it needs to handle 50,000 lbs.

Any engineers out there or concrete contractors that can
share specs. to handle this kind of
weight. We live in the Texas Hill Country, very rocky soil conditions.
Interested in thoughts on base,
rerod size, placement and concrete depth?

Appreciate if anyone has experience with this.
Thanks!
There are several factors to be considered; soil characteristics and compaction under the slab, concrete mix type, reinforcing material and slab thickness, primarily. Our RV resort pad was constructed to support 45' luxury coaches (aka "heavy rigs"). The parking slab is 8" thick and the approach to it is 6" thick. These measurements are actual slab thickness, not the result of using 2X6 or 2X8 forms that measure about a half-inch shorter. It also has a reinforcing rebar grid embedded in it.

I believe a 3,500 psi mix was specified. A 12" base layer of road base material underlies the slab and was compacted several times with resting periods of several days in between.

TJ
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Old 12-10-2018, 06:04 PM   #5
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If you look on the web concerning concrete paving you should be able to determine what you need.
If it was my driveway, I would spec 3000 psi mix regular rock with fiber, 4 inches thick. The sub base needs to must be compacted to provide a firm base with provisions to handle any water from drainage from sides of the driveway.
This can be expensive. Asphalt paving is less expensive but still needs a robust sub base and paving thickness.
Concrete is the best.
Regards.
JimB

25 years in the concrete business
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Old 12-10-2018, 06:07 PM   #6
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The post by Tranquil
Is way over needed.
Is you are paving a highway, maybe.
JimB
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Old 12-10-2018, 06:13 PM   #7
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Quote:
Originally Posted by JBDISCOVERY View Post
The post by Tranquil
Is way over needed.
Is you are paving a highway, maybe.
JimB
You may well be right. The parking slabs were designed to support even the heaviest coaches. From my perspective, I'd rather be over engineered than under engineered and have to do it over again.

TJ
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Old 12-10-2018, 06:19 PM   #8
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In Texas, the subcontractor is not the key person. The guy you really want to make sure knows the requirements is the Professional Engineer (PE) who designs or approves the foundation design.

We used 6" of concrete in a post tension slab. The engineer added a layer of wire mesh when he found out there would be a motorcoach parked in the big garage.


Make sure you you have a 14X14 (minimum) door and 16 foot (min) ceiling

Good luck!
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Old 12-10-2018, 06:20 PM   #9
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Driveway thickness for RV

My pole barn has 1 ft of dusty 53 stone compacted every 4”. When done, it is flat and hard enough to bounce a basketball on it. Then 5” of 5000 psi concrete. Good enough for my 45’ MADP and my two post lift. I did my first one 10 years ago and it still doesn’t have a single crack. I did not use rebar.
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Old 12-10-2018, 06:34 PM   #10
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5 1/2 inches

We just poured a slab for our Coach (see details below) and our very experienced contractor said that 5 1/2 inches with rebar and fiber would do. He said that all concrete will eventually crack but the thickness and additional reinforcement should keep us in good shape for a good while.

He poured the other side of the slab at only 4 1/2 inches as we were only putting a pontoon on trailer and our pickup truck on that side. The sand mold was interesting looking.
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Old 12-10-2018, 06:50 PM   #11
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I would agree with JBDISCOVERY. 4 inches is sufficient, assuming the base compacted properly. It’s not like a highway that has constant traffic at high mph 24/7. Control cuts and a good approach/entry are a must.
Seems to me (self included) most MH owners are perfectionists and tend to over do or over build stuff. Nothing wrong with it, if I had the extra cash, would probably Go the extra also.
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Old 12-10-2018, 06:54 PM   #12
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Quote:
Originally Posted by heathtx View Post
In Texas, the subcontractor is not the key person. The guy you really want to make sure knows the requirements is the Professional Engineer (PE) who designs or approves the foundation design.



We used 6" of concrete in a post tension slab. The engineer added a layer of wire mesh when he found out there would be a motorcoach parked in the big garage.





Make sure you you have a 14X14 (minimum) door and 16 foot (min) ceiling



Good luck!


Garage is done and we had a PE
spec just as you detailed. We did
a 22x53 with a 14x15 door and a
16’ interior ceiling.

We just want to make sure they do
the drive right. Its about 225’ long
so a major investment.
Thanks !
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Old 12-10-2018, 06:54 PM   #13
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We built our driveway with 4” compacted road base, 4-5” 4000 psi concrete. The key is to make sure you can support “the contact area” of the weight you are supporting. Ok to simplify if all your 40000 lbs exerts its force on one inch you need to carry 40000 on that one inch spot. If you carry the 40000 lbs evenly on 600 sq in (100 sq in tire (10X10”pad) contact x 6 tires) then your pressure per sq in is 40000/600 or 66.66...lbs per sq inch.

Ok engineers, I know this over simplifies this. I.e. tread does not allow for 100% contact and distribution of weight is not equal. But my point is, just because your RV is heavy does not mean the weight can’t be carried on even modest strata. Next time you drive your rig down a dirt road try to figure out how the road is carrying your weight .
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Old 12-10-2018, 06:56 PM   #14
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Oh by the way our concrete is inset with rebar on 12” centers. You should look at doing this to keep cracks down.
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