Slab thickness for bus or truck

**DaveVman** · 16th March 2022, 12:39 PM

For standard steel portal frame shed on concrete slab. 70% of slab is on fill and thus will be built with piers into natural ground. If one day I want to store a bus or truck in my shed. I.e. to convert a bus to a motorhome. Then is the currently planned 100mm thick slab going to cut the mustard?

The current plan is to have a standard 100mm thick slab. Ignoring the piers and the bits where the steel posts are, the rest will be 100mm. There will also be a 1m wide strip 150mm thick along the 10m width positioned about 3m in from the front doors. This thicker strip is to give me options for a 2 post car hoist. (not to lift up a truck - just a car or ute).

The main use in the shed will be woodworking and other stuff but I'd like to have the option to one day DIY convert a bus or truck to a motorhome in there. And if I ever do that we'd have to park the motorhome in there most of the time.

**Beardy** · 16th March 2022, 01:07 PM

It really depends on how good the sub base is.
When we build factories and car parks for trucks the standard speciation is 100mm of DGB compacted to 98% on virgin material and a 150mm slab with one layer of F82 as top steel. The concrete is 32mpa not so much for strength but the added abrasion resistance
If there was filled sections there would be reinforcement mesh top and bottom plus some additional Y16 across the span

A bus or light truck is going to be lighter than what the trucks the above is designed for

**BooY** · 16th March 2022, 01:15 PM

When I ddi mine, I asked for slab to support light forklift/truck usage so prolly a little overkill for you intended use but it might give an idea.
They quoted me for
f82 bar work
125mm thick
32mPa for the main pour
250mm x 300mm edge beams
Pier under each portal
This was on a 100% cut for the entire shed area

**tonzeyd** · 16th March 2022, 11:23 PM

Just out of curiosity, what dimensions was the slab and cost?

**DaveVman** · 17th March 2022, 07:55 AM

Originally Posted by tonzeyd

Just out of curiosity, what dimensions was the slab and cost?

I have various quotes but the short answer is: 100mm thick 225m2 $21,720 + $380 for 10m2 at 150mm. However that might go up slightly once their engineer designs the piers for our soil and fill.

**Sam** · 17th March 2022, 11:12 AM

Beardy is on the money. Almost all warehouses I’ve done are the same.

**truckjohn** · 17th March 2022, 11:48 PM

Most commercial truck and bus drivers refuse to drive on a standard residential driveway, which is 4"/100mm. You're looking at crack city. Same for forklifts. If you want to bring trucks in, make sure the sub-base is properly compacted and a suitable bed of gravel is installed as well.

As you see on the price - the extra thickness is peanuts compared to the total price. You're only talking 1.5% increase.

**riverbuilder** · 18th March 2022, 09:30 AM

A bloke at a place I looked at to buy recently had a big shed with a couple of buses in there he was converting, he’s done a few of them apparently. The slab was as perfect as the day it was poured. When I asked about it, he showed me a photo of the reinforcement, he’s cast in several lengths of railway line, under the mesh, along where he drives the vehicles in and they sit. Cheap, and works perfectly well.

**Pulse** · 18th March 2022, 09:45 PM

Second what the others said, my shed was 125mm 32mpa with sl82 mesh, bored piers in the guts , 2m centres and wall around the edge as it was on 700mm of fill, no cracks at 2 years

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