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Turning a dirt floor building into a concrete slab workshop

BRUGG13

New member
Joined
Aug 1, 2024
Messages
1
Hello everyone, this is my first post and I have a pile of questions so please hang with me.

My parents still live at my childhood home in Louisiana. On the property, there is a building the previous homeowner built there to make some sort of shop for himself. One "room" of this building is about 16'x16' and has an existing unlevel** dirt floor. My dads mentioned renovating that building into a workshop to get his projects out of their garage. We went over and looked at the project and got a game plan on what needed to be done. Where this building is at, we wouldn't be able to get a truck back there to pour so we're planning on renting a mixer and concrete bags. I've researched how to DIY pour a slab but want to give a rundown of what 'i think I know'.

Starting off, there's a spot that looks like it has some water draining on the floor from the outside, maybe from under the building over the years. I plan to line the room with cinderblocks before I pour the slab. Should I do anything else as far as the drainage spot is concerned, put a layer of gravel or anything?? Also, the dirt is extremely hard so what is the best way to break it up and level the dirt with it being so hard? Would you recommend a tiller or some sort of aeration or something else? After that, I know we want a 4" slab. Should I use rebar or mesh or nothing for the supports? Nothing heavier than an SxS would ever be on this slab due to the location so I'm not sure what type of reinforcement if any. I plan on cutting the joist in the concrete after everything is set and cured. Second off I've read of vapor barriers, do I need one, and what's the purpose? I don't really have any concrete tools so any recommendations on that? Other than that I know it's going to be a pile of hard work which doesn't scare me. I just want to make sure it's not going to be completely screwed up if I go this route..

I know there are people in this thread with so much more experience in doing this type of project so I wanted to see if there was any insight I could get from anyone with similar experience.
 
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mcj115

Well-known member
Joined
Dec 4, 2018
Messages
297
Location
Hershey PA
What is the foundation of the shop? What is the grade? How does the roof drain? What is the local water table?
 
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ConCretin

Well-known member
Joined
Jan 20, 2011
Messages
3,379
Location
Central Maine
Take a look at my Guide to Floor Slabs in the link below for some thoughts on constructing a slab on grade. It should answer most of your questions.

When it comes to leveling the sub grade, I'd be inclined add crushed stone to bring the low spots up rather than level the high spots. The stone would have the added benefit of providing a capillary break and a stable surface.

I'd also caution you that the advertised strength of bagged concrete mix is based on minimal mix water, which will be very difficult to place. Adding more water will make the concrete easier to work with but it will reduce strength, In addition, a 16'x16'x4" slab will require just over 3 cy of concrete, which is about 145, eighty pound bags. It's doable but it's a lot of work.
 

drmarkr

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Joined
Feb 5, 2006
Messages
4,232
Location
Tucson
Is it too big to try this? This worked pretty damn well for me...

 
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