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?
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Just read the brochure, its all in there.
on-grade floor drains are for use in ground-level applications, or where a waterproofing membrane is not needed.
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