install drain tile and floor drain

[BirksToyBox]

Finally started my garage Waiting on my inspector to bless my plans. Anyone know if you can tie a drain tile (4" perforated)(in green) into a yard catch basin drain? Will a 3 inch floor drain piping work? or will he request 4?

 

[HoosierBuddy]

I think it is pretty likely that your inspector will quash any plans for your floor drain.

Where I've seen garage drains that had to meet inspection criteria (code), it involved a sump in the garage with a stand pipe to prevent any oil spill from going into the drain. The sump had to be so large that it rendered the floor drain useless. If you washed a car with that setup, the 20 gallons of water left in the sump would stagnate and quickly stink up the whole garage.

However....if he doesn't tell you "no way"....what I would do is run it out to a catch basin with a grated lid lower than the garage floor and run a "french drain" from that catch basin to allow water to dissipate into the ground normally, but be able to overflow into the yard if too much for the french drain to handle. I'd use 4-inch.

I can't imagine that will pass the inspector though.

The standards are all about keeping you from having a spill that ends up in groundwater.

 

[Fav Onefour]

Garage floor drain and connections are dependent on local code. Around here it is common to do daylight drains. They are ok for residential up to specific size garage. If you are over the size spec, things change a lot. Separator setups are spendy. Going that route also puts you into a whole new set of code requirements. Bla, bla, bla. It's a bunch of details we don't need for the discussion.

First thing, look up local code. They probably default to another building standards code unless you're in a fancy city with fancy rule makers.
Looks like you are going to be around 1,000 sq ft with space. That may be a factor. Look up the code.

The questions about pipe size will probably not be covered in code. I can give some personal perspective.
You mention three inch drain piping. What kind of drain are you planning? The diagram shows a trap drain. I do not like trap assemblies. Around here they need to be in a conditioned space for freeze protection. They plug way too easy no matter where you live. I'd verify if that is needed.
Sounds like you are using smooth wall perf for at least part of the line. Definitely better than corrugated anywhere on the line. I would plan on non perf past the footing. Draining to a yard basin might be tricky. Over time sediment adds up. That option also goes back to the first point. In fact, most of the discussion goes back to what is required before we can talk about real options.

 

[BirksToyBox]

I’m hoping that the inspector won’t mind that I tie in my 4 inch perforated drain tile into my smooth 4 inch yard basin drain. I definitely want to put a drain tile in but I don’t want a sump pump pit. Thanks. Hoping to find out Monday and get the washed stone delivered soon.

 

[BirksToyBox]

Here’s my slab detail

 

[Jackfre]

From your drawing it looks like everything is funneling to the garage or close to it. Could this area drain back up to fill your garage? I have seen area drains fail. Do not use the thin wall piping for it. Go with Sch 40. I think before I put in a floor drain I’d build up the base elevating the garage so the drain isn’t needed/wanted. FD’s are a pita, in my opinion. Welcome, by the way. As you are getting started on this and will likely be asking other questions you might consider adding a general geographic location as advise varies by latitude.

 

[BirksToyBox]

Thanks. Yes schedule 40. Elevation is set.

 

[Fav Onefour]

Wow, hand dug?
It doesn't look like you have a lot of elevation to use for drainage. It does look like you have a sandy mix. Have you had standing water in the area with the catch basin? Your other building is already funneled to the spot. Adding another building will load the drainage capacity.

Proper catch basins can work. If you already had water in that spot, it will not do the job.

 

[BirksToyBox]

Yep me my shovel n a wheelbarrow. 2 weeks.. bout 2 hours a day. I don't like arguing w contractors. You want it perfect and the way you want it done.... do it yourself.

Never standing water at that lowest spot where I put the basin. I don't want a swale either. Slope .25"/ft Will add cleanable screens at both ends. Also thinking bout heat tracing it.

What you guys think about adding my "slab perimeter drain tile" to my yard catch basin drain. The perforated drain tile will be 4 inches above my yard basin drain where it connects. Then .25 inch per foot out to daylight. You think the inspector will even care? Its my next step. I'm calling him soon, Its been 7 business days without a word. Don't want to bug (annoy) him though.

 

[Viper98912]

I've always thought it was neat idea to have a drain pipe in the garage where you can wash off or squee-gee any cars and snow/salt, etc. But it does bring up a good point, what if the inspector asks, how do you confirm that you're not putting down oil into the ground?

 

[BirksToyBox]

Floor drain is a different concern at this time. Hoping he lets me cap it for the time being with the understanding of a future holding tank.

 

[Fav Onefour]

Slab perimeter drain tile?
I was under the impression that you already have exterior perforated tile. Are you asking about doing another round inside the footing?
I get the idea of putting in the drain and going with hope. I wouldn't count on that around here. I'd find out if a daylight drain will pass.