Installing floor drains in yet to be poured slab?

[deepstuff]

I'm installing two floor drains in my 32 x 44' thickened edge slab. Slab is still not poured and I still need to add 5-6" of stone inside my forms before I'm ready to pour. Should I wait until stone is in place before I install drains or try and add them first?

I know I'd have to dig part of a trench in the stone but stone trench would also help hold everything in place.

 

[krandrew]

Definitely put your stone in first then trench for the drain lines. It allows you to easily grade the lines and also provides protection working around them

 

[BuilderFrank]

By stone Im assuming you mean gravel.
Lay pipe drains to what ever elevations you need before grave. It'll save you the headache later. Just steel stake the pipes to hold them in place, once your all graded just knock the stakes loose and pull them out.

 

[Rookie2]

Digging in loose gravel ***** ! Do them first.


Compact that stone till you run out of fuel (rent a plate compactor or small roller.

 

[Firebird 1]

If your using linear drains, put them in to elevation first. Then use some sakrete under them in a few locations to hold them solid before and during the pour. I have installed a mile of these in firehouses and we do it this way. They always turn out correct.

 

[Leaflessshadetree]

Digging in loose gravel ***** ! Do them first.


Compact that stone till you run out of fuel (rent a plate compactor or small roller.

Digging in compacted gravel ***** as well.

I agree with doing everything needed under the gravel first.

 

[Rookie2]

I always **** when I leave quick replies ! lol

 

[theoldwizard1]

Check your local codes ! Many places do NOT allow floor drains AT ALL. Or they require expensive/complicated water/oil separators.

 

[RossABQ]

Check your local codes ! Many places do NOT allow floor drains AT ALL. Ot they require expensive/complicated water/oil separators.

That's usually when they are connected to a city sewage or storm system from a residential garage.

 

[sixty4]

That's usually when they are connected to a city sewage or storm system from a residential garage.

That's what I argued with plan review before I built mine. Guy said even if I run it outside to an open area (that I had a spot to do so), what's to say I won't tie it into the sewer or storm after inspection.

I was like well why would I do that septic is on other side of my property and I am over 400' from the road with no storm sewer? Guy still insisted I could not have them in my detached garage. I just pitched the floor instead.

 

[James-W]

That's usually when they are connected to a city sewage or storm system from a residential garage.

It isn't just the sewer system they don't want the drain going into, the idea is that the drain doesn't put hazardous materials into the ground either. Around here you can have a drain in the garage, but it needs to go into a holding tank where it gets periodically pumped out.

 

[ct03911]

No floor drain allowed in my garage either in CT. Sloped the floor extra.

I installed a septic for the shop sink to drain into and drain grates in the apron outside the doors will handle car washing runoff etc with the garage doors up an inch.