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mattorrell 05-29-2013 06:34 PM

Shower Pan & Above Floor Waste Line
I am currently renovating the bathroom in my condo. It has a traditional 30" by 60" tub/shower combo utilizing an above floor waste line.

I am considering converting the tub/shower into a shower only, using either an acrylic shower pan or the Schluter system for a tile shower pan. However, in order to use either option I would need to build a false floor above the waste line, then set the shower pan on the false floor. False floor would be made of 2 x 4 and 3/4" plywood.

Interested to know if I am thinking about this correctly and if people have experience with shower pans and above floor wast lines?

Thanks in advance.

oh'mike 05-29-2013 06:40 PM

Could you describe the waste line? I've never seen an above floor drain without a sewage pit and pump.

mattorrell 05-29-2013 10:13 PM

It's a 1.5" pvc pipe that branches off the main trunk that runs between floors. It runs underneath the tub, where it joins with the tub drain.

The current tub is steel and was made to accommodate an above floor waste line. I started out considering just tub replacement, but the choices are very limited given that it is an above floor waste line.

oh'mike 05-30-2013 05:04 AM

Showers need a 2" drain---and a P-trap right below the shower drain--How can that be done?

mae-ling 05-30-2013 09:25 AM

Just out of curiosity because I have never heard of such a tub or drain system, where are you from?

mattorrell 05-30-2013 10:57 AM

I am in Boston. I agree it should be a 2" line, but there is no changing from the 1.5" line given how it is joined with the main trunk running between floors. It would mean a reducer to join from the 2" drain to the 1.5" line.

The false floor would be used to accommodate the the above floor waste line.

HandyAndyRR 05-30-2013 10:00 PM

Look into the shower systems from Aker by Maxx. They offer some of their shower and tub bases with an 'above the floor rough' option. This sounds like it would fit what your needs are unless I am understanding your situation wrong. This would eliminate the need for the false floor.

mae-ling 05-30-2013 11:40 PM

A 1.5" line may not cut it, have to look into your code. Gonna need a permit too.

mattorrell 05-31-2013 12:27 PM

I had a plumber provide an estimate and he advised that the building code requires at least 1 tub in a dwelling. So, conversion to shower only won't happen. I will just do a tub replacement or he recommended I look into Bath Fitters which makes an acrylic liner.

Does anybody have experience with Bath Fitters acrylic tub liners?

TarheelTerp 06-02-2013 05:19 PM


Originally Posted by mattorrell (Post 1192010)
...he advised that the building code requires at least 1 tub in a dwelling.

I've heard this before and believe it's an erroneous reading of code text
that has been copied over and over again from the early days.

Ask him to show you the code section.

mattorrell 07-29-2013 06:22 PM

It's an improper interpretation of code. The requirement is to have a tub or shower according to the building inspector.

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