Floor slab thickness

[C-Mac]

Anyone done a 2 story garage with drive in access to the 2nd floor? I'm curious what slab thickness and construction techniques were used. Any direction would be appreciated (I've tried the search function but can't find the right terms to narrow results)

 

[jkeyser14]

Anyone done a 2 story garage with drive in access to the 2nd floor? I'm curious what slab thickness and construction techniques were used. Any direction would be appreciated (I've tried the search function but can't find the right terms to narrow results)

5" concrete over steel decking set on steel i-beams. But each design will require engineering to determine the proper size decking and beam spacing.

 

[C-Mac]

What size beams on what centers? I have no intention of winging this, just curious what sort of budget I'm looking at.

 

[FullRaceMerc]

Not an engineer but I would think proper shear for the lower level would be critical. A car stopping while pulling into a garage seems like it could put a large lateral load on the building. Maybe it would come from anchoring the second floor deck into the adjacent hill.

Sounds like a good job for that engineer.

 

[C-Mac]

Agree completely on the engineer. I have a One ton truck and don't want it in the "basement". Like I said, just attempting a material take off to assist in budget generation.

 

[yeldogt]

It's expensive ... have to have a structural engineer. My architect farmed it out to a specialist.

 

[ssdave]

As an engineer, I've done a couple of these designs. You use specific steel decking made for this, and welded on studs that come up into the concrete to adhere the steel to the cured concrete. The steel becomes the tension reinforcing for the concrete slab, once it is placed and cured. The technique involves cribbing up the steel into position, welding the studs on, placing the concrete, letting it cure, and then removing the cribbing. You can span long distances; typically I've tried to design intermediate supports at about 12'o.c. to lessen deflection. The entire floor becomes a diaphragm, so the shear is transferred to the outside walls and usually that's not a problem, depending on house design, because it takes some pretty stout walls to hold up the weight of the floor. My preference is to have concrete walls; there's a lot of dead weight to hold up in a 4" or 6" thick garage sized slab, in addition to the live weight of cars and stuff.

 

[Northislander]

I'm planning on doing a post on my build when i get some time. I just poured my 5" suspended slab last Friday framing the garage now. Just came inside because the snow is coming down and its getting slippery out there. Anyways i have a budget of 75000 Canadian dollars for the build. Here are some pics.
garage dimensions are 21' x 24' x 9' ceiling studio underneath dimensions are 21' x 16' x 8'6"ceiling this was the maximum size i could build under local zoning

 

[C-Mac]

What kind of loads are you expecting on your second floor? I see you used the ICF system for the floor, was it easy to erect?
The garage I'm planning to build is a single car, maybe 14 x 28 or close to, depending on what the town will allow. I was hoping to have a "basement" with floor to ceiling shelving for storage, maybe setup a lathe down there. I'd have e a 4 x8 road plate in the middle of the floor and an exposed I beam as a ridge beam to run a winch and trolly. Besides pulling g the front of my truck in to pull the motor, I'd be for smaller projects only.

 

[Northislander]

We used the quad-deck icf floor system it was very easy to install the forms about an hour. The shoring underneath took a bit of time as we had to get "innovative" we have a large dam project going in our area and they have all the conventional shoring components from the rental yards.
450 rebar stirrups for the beams we had bent for us it then took two guys 8 hours to build the beams and lower them into the icf floor slots then another day for two of us to tie the rest of the rebar

 

[Firebrick43]

I built an icf house with a suspended composite steel slab with in floor heat. While not a garage it certainly would support a one ton truck as to get the stiffness I wanted it increased the load capacity.

The deck is 6" thick. The pan for the 28x50 floor was 3000$. The main beam was a 12" x 26# wide flange beam down the center on (3)4" steel tubing post.

Engineering was 500 dollars and floor ended up being right around 6$ a square foot.

 

[ard]

As an engineer, I've done a couple of these designs. You use specific steel decking made for this, and welded on studs that come up into the concrete to adhere the steel to the cured concrete. The steel becomes the tension reinforcing for the concrete slab, once it is placed and cured. The technique involves cribbing up the steel into position, welding the studs on, placing the concrete, letting it cure, and then removing the cribbing. You can span long distances; typically I've tried to design intermediate supports at about 12'o.c. to lessen deflection. The entire floor becomes a diaphragm, so the shear is transferred to the outside walls and usually that's not a problem, depending on house design, because it takes some pretty stout walls to hold up the weight of the floor. My preference is to have concrete walls; there's a lot of dead weight to hold up in a 4" or 6" thick garage sized slab, in addition to the live weight of cars and stuff.

You have a youtube video with a DIY I could follow??

Thanks!








(you KNOW I'm kidding...)