basement tub rough in

Folks,

I'm nearly finished my basement bathroom rough in. The last thing( I hope!) is the rough in for the tub (was never a tub there). What i've done so far is run a 2" drain to the edge of a hole 12"x12"x12" . Do I hook up a 1 1/2" 'p' trap to my 2" drain now or do I wait until I get the tub?. I'm planning on a standard size tub (if there is one). I'm concerned about the exact placement of the 'p' trap to take the tub drain, any tips?

Thanks for looking and hopefully you can help me out.

Your tub will use a 1.5" drain, so since you roughed in for a 2" drain, you may as well use a 2" p-trap and adapt to the tub drain with a reducing coupling or right at the p-trap with a bushing. And yes you do have to wait to install the p-trap...you can't use a union p-trap (atleast not where I am) in a closed off area like underneath a tub. I suggest you plan what you are doing because plumbing a tub drain in reverse is not a task for the inexperienced.

There doesn't appear to be any real standard for drain location for a tub, so wait until you buy the tub to make the final connection.

Thanks for both those replys folks

Will do Grumpy!

gp

You mean you do not run EVERY tub drain in 2"? I do.

hj said:

You mean you do not run EVERY tub drain in 2"? I do.

Click to expand...

No...and I don't know of a plumber in my state that does.
For that matter...here, right outta my code book:
Plumbing Fixture Trap Size in Inches
Bathtub (with or without overhead shower) 1½
Bidet 1½
Clothes washer (domestic) 1½
Combination sink and wash tray 1½
Combination sink and wash tray with food waste grinder unit 1½
Dental unit or cuspidor 1½
Dental Lavatory 1½
Drinking fountain 1½
Dishwasher, commercial 2
Dishwasher, domestic 1½
Floor drain 2
Food waste grinder 1½
Kitchen sink, domestic, with food waste grinder unit 1½
Kitchen sink (two compartments) 1½
Kitchen sink, domestic 1½
Lavatory, common 1½
Lavatory (barber shop, beauty parlor or surgeon's) 1½
Lavatory, (multiple type) (wash fountain or wash sink) 1½
Laundry sink (one or two compartments) 1½
Shower stall 2
Sink (surgeon's) 1½
Sink (flushing rim type, flush valve supplies) 3
Sink (service type with floor outlet trap standard) 3
Sink (service trap with P trap) 2
Sink, commercial (pot, scullery, or similar type) 2
Sink, commercial (with food grinder unit) 2