plumbing rough in questions

[thammel]

Hi,

Working on plans for the new 32 x 28. Before the floor pour, I know that's when the plumbing rough-in need to be done, especially for the toilet. Planning a sink also, means that should be tied into the drain. I got a ridiculous estimate from a local plumber of 8k$ to do this, do the rough-in for a new laundry room in the new mud room and relocate a powder room plumbing.

Here are my questions:
1)I'm in Maryland - how do you deal with inspection and do you need a licensed plumber to do rough-in work?
2) Can anyone give me key tips on the garage rough-on work?
3) Have any of you done this yourself?

I've done lots of copper, pvc and cpvc work, so am not a novice. I've installed utility tubs, well tanks, well neutralizers, etc.

I'd appreciate any guidance and help!

Thanks,
Tom

 

[boiler7904]

Your first question needs to be answered by the local building department

#2 - Buy the toilet you plan to use now and store it for a while. You don't want to do a 12 1/2" rough in only to find out you have a 10 1/2" toilet or vice versa.

Check and double check all pipe locations against your wall layout before you start installing the vapor barrier and mesh. I was checking a few items on a building last week before a slab pour and noticed that the utility sink rough in was off by a few inches which doesn't seem like much but because of the layout of the space, it had to be perfect.

Make sure you get good compaction of the backfill around the pipes. The slab will crack later if you don't.

Create an as-built drawing showing where everything is for future reference. You never know what might come up.

Think about adding a shower.

Add a floor drain in the bathroom in case the toilet ever backs up

#3 - Never done it myself but I'm around it all the time on my commercial job sites.

 

[kbs2244]

I don't know about the need for a license. Some jurisdictions let a homeowner do it for them selves, even with an "expert helper" as long as no money changes hands. Other are more strict.
The biggest thing for in slab drains is slope. I believe 1/4 inch per 10 feet is pretty standard. But check.
Next is no interior obstructions. All fitting have to have the pipe seated all the way home with a smooth, square cut so there is no place for something to snag on as it goes through.
Third is nothing organic under the slab. That means no wood supports for your pipe. Plastic, metal, brick, but no wood.