Bathtub drain traps

[Danny Castellano]

I have been running into a lot of tubs without drain traps, are they required? The one's I have not seen them on were on slab foundations with access panels. Could they possibly be located below the ground?

[Blaine Wiley]

If you can't see the drains, how do you know they aren't trapped? Yes they are required.

Most traps in a slab on grade installation will be below the surface of the slab unless the tub is installed on a platform.