Adding a garage addition using treated lumber for the floor?

[fred d]

I have 2-20'x24' garages. 1attached and 1 detached
i want to get all my tools and equipment in to the detached garage so i can build a office/extra bedroom in my attached garage

I would like to build a 14x18 addition on my garage and trying to do it on a budget

Getting concrete behind the garage to pour a slab is going to be a challenge.

Looking for advice about using treated lumber for the floor.

The floor will be elevated about 2"-3" above the ground

The addition will basically house my roll around tool boxes(4), shelves, nuts/bolts bins & fastener storage mig welder, stick welder
And my woodworking tools-lathe, table saw, jointer, Thickness planner, drill press and assembly/outfeed table (lots of weight)

Basically freeing my 20x24 garage up to work in with only my main work bench, solvent tank/parts washer, bench grinder, sandblast cabinet, oxy-acetylene torches & 80 gal compressor to work around (small enough amout of items to cover to be able to paint a vehicle.)

Is this do-able?

All opinions welcome

 

[jkwilson]

You couldn't vent something like that. I wouldn't even think about it for anything but a temporary structure.

You can pump the concrete, carry it in a Bobcat bucket or even mix it in the backyard to get a slab or footer poured.

 

[Mustang51js]

I don't see a problem, basically it's a shed

 

[CharlestonJoe]

You could get away with an all treated wood floor and floor system. However, by the time you beef it up to hold the weight and lug all that heavy azz treated plywood around you'll be wishing you just bit the bullet and did a concrete floor.
I would have it pumped around. If your not familiar with pumping concrete. A concrete pump man is hired, price varies $250-500, he backs the pumper up to the concrete truck, it dumps into his pumper, then it runs through a 4 inch hose around to your backyard location where a man wrestles the hose and directs it around your in your formed area. He will need to clean the hose out when he is done. So set up a spill spot for the excess and clean up.

 

[bczygan]

Either way is possible. Pump and use concrete or frame a wood floor.

A wood floor won't allow you to use the space for any kind of vehicles, even yard machines, unless you install a ramp.

Inside the garage, it will get real old, real quick, stepping up onto the wood floor from the concrete slab in the existing garage. And to keep the step low enough, you will need many footing blocks so that the spans for joists are small and the joists can be shallow.

For the cost difference of pumping the concrete or finding another way to get it there, it seems the wood floor is just a jury rigged solution.

 

[Kevin54]

To get concrete around to the backyard, just rent a concrete buggy. Easy enough and it won't tear you your yard.

As far as building an addition with a treated floor, someone else may know the members name, but he has a large pole building, and he has a wood floor in it. It houses his woodworking shop.

 

[Woody610nb]

I had a wood floor in my last pole barn wood shop and loved it. Wood workings hate concrete floors. 2 X 6 treated joists, 12" oc with piers every 8'. I am planning a new one in my new house and will do it the same way.

 

[CharlestonJoe]

I didn't think about the concrete buggy. If you have a soft yard it could tear it up a little. They are a lot of fun though. Here they call them Georgia buggies.
The OP said it was an addition on to his garage, so I'm thinking he is going through his garage into it, so might not need a ramp Which makes concrete a more sensible floor, concrete to concrete instead of concrete to wood. IMHO.
Here those buggies are like $250 a day though.

 

[ozyborn]

Throw down some osb on the ground , get a few friends and wheelbarrows. I helped pout a 20x30 slab that way last year. Also gives a great excuse for a cookout

 

[mikefromme]

Cut a hole through the wall where the addition is going to be. Back the concrete truck up to the garage door and wheel barrow it the 5 feet the chute won't reach.

 

[NUTTSGT]

Is the floor (of the addition) the same height as the older concrete garage floor ?

 

[woodrail]

Click the link in my signature. My shop is about 22'x22' "pole barn" construction over an old smaller garage. The original floor still remains under the wood floor. It is busted up asphalt. My floor has treated 2x4's laid on the flat and leveled at 16" oc. The floor is 3/4" standard plywood.

It's been down 2 or 3 years now . I've had no issues even under the leaky skylight, just some raised grain.

I LOVE working on it. It just seems the right choice for woodworking. I think it's a "Spirit" thing?

I'm not sure I would do this without some kind of protection such as at least a gravel and a mud slab. Too many creatures of the night around here.