streetdaddy
Well-known member
I'm going to be pouring a slab early next week. I want to make sure water doesn't get into my garage. How high does the concrete floor sit above the bottom block?
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Help me with slab height
- Thread starter streetdaddy
- Start date
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streetdaddy
Well-known member
I have seen water come down that back alley about 4 inches high. I just want to make sure that no water gets into my garage. I hate water issues!
Well if you're pouring right now it's too late. But I would have rebar doweled every third cell vertically then bent back horizontal into my slab and capped the block. Even though you're obviously not using bar in your slab I would have then also tied a length across the entire width of the opening and doweled the stem wall on both sides. That would keep the entrance from shifting when it aventually cracks.
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streetdaddy
Well-known member
Well they're not ready to pour just yet. I hope and think they will put some rebar in there and fill it with gravel. I'm just talking about how much higher with the slab be then the lowest blocks now. I want there to be a good fall to the alley. Since it's the weekend I can't get a hold of the foundation guy. And I work a 24 tomorrow .i'm just trying to figure out how high do you guys think the concrete will be above that Lowest block. If it's gonna be level with that block I need to shut down this whole thing and maybe add another block.I don't want to be worried about water issues every time it rains
Bud that's an impossible answer to provide without knowing your grade and fall to the street. Also knowing how deep water can back up in and around that area. Normally the cap over that last course would be 3.5" if you're going with a 4" slab. You can always go with a half course too if you only need another 4" of rise, nothing says you have to use a full block. Rule of thumb to shed water is 1/8" of fall per foot. But realize that might be more angle then you're looking for depending upon your intentions for the area.
So what's the deal with the footing. Looks like you're going with a double wide door at the street and a single in the rear?. And if so is this to be able to pull all the way through or just great ventilation?
So what's the deal with the footing. Looks like you're going with a double wide door at the street and a single in the rear?. And if so is this to be able to pull all the way through or just great ventilation?
the height of the floor to the top of the stepped down blocks is irrelevant. place the floor at the level you want. either to top of blocks or stepped down a few inches.
where the block steps down, you just pour the slab deeper until it reaches the block.
the big question is what is the height of the top of the block wall in relation to the alley? you say it floods 4", so you have to be up from there a bit.
where the block steps down, you just pour the slab deeper until it reaches the block.
the big question is what is the height of the top of the block wall in relation to the alley? you say it floods 4", so you have to be up from there a bit.
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streetdaddy
Well-known member
I've got an 18 foot door back in the alley. From the house it will be a 4 door sliding glass.
Good to know. I was assuming it would be flush to the lowest block which freaked me out because i have seen water 6" deep across my back yard a few times. I am at a low spot and during heavy rains the Nashville storm drains pop off and dump water down the alley.
Good to know. I was assuming it would be flush to the lowest block which freaked me out because i have seen water 6" deep across my back yard a few times. I am at a low spot and during heavy rains the Nashville storm drains pop off and dump water down the alley.
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streetdaddy
Well-known member
Or instance… I've seen water is high is this crate before in my backyard. So I just want to make sure it doesn't get into my garage . So the slab/ door needs to be a few inches above this? My foundation guy says he is confident water wont get in but he will be long gone if it does!
hh76
Well-known member
There's a drain in the alley? You will never have standing water above that drain, baring major flooding.
Figure the driveway should have a slope down to that level. Probably 1/4" per foot, so measure from there.
Your concrete guy should know all this and will probably have a laser to measure.
Figure the driveway should have a slope down to that level. Probably 1/4" per foot, so measure from there.
Your concrete guy should know all this and will probably have a laser to measure.
OP
streetdaddy
Well-known member
They are getting ready to pour my slab now. They poured footers, laid the block and added gravel and tamped it down. They will be adding a moisture barrier,too.
Should they be adding rebar or wire mesh?
Should they be adding rebar or wire mesh?