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What is the difference between an "on-grade" drain and a "flashing" drain? What situations call for which? If installing a basement floor drain, which should I use?

In case it's not clear, here are the items I'm researching:

On-Grade Drains

On-Grade Drain


Flashing Drains

Flashing Drain

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Just read the brochure, its all in there.

On-Grade Drains

on-grade floor drains are for use in ground-level applications, or where a waterproofing membrane is not needed.

Flashing Drains

Flashing drains are typically installed when a waterproofing membrane is used to protect finished areas under the drain.

you are going to want an on grade drain for almost all basement slab applications

  • Any idea what it means when the pipe width is quoted as 3" x 4" instead of a single number? I would think this implies a coupling that converts from one size to another, but I don't see that on these drains... – bubbleking Apr 7 '16 at 5:06
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    Like toilet flanges, they will fit on the outside of a 3" pipe and on the inside of a 4" pipe. – ArchonOSX Apr 7 '16 at 11:49

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