building code in my area calls for a
floor drain in the laundry room. But the laundry room in my house is on a
standard wooden floor above the crawl space, not on concrete. So here's the
problem. The only floor drain you can buy is for flush mounting to the floor.
And when the water softener and furnace condensate drain lines flow into the
drain, there will invariably be water running onto, and ruining, the finished
floor. It'll also seep under the drain and eventually rot out the subfloor
underneath the finished floor.
invented a solution—a recessed drain using standard PVC plumbing fittings—but
in an unconventional way.
First I traced around the 4-in. sewer and drain
adapter and cut out the opening, just a little larger than the fitting. Then I
glued it to the sides of the opening, flush to the floor with construction
adhesive. (Wedges made from small shims held it in place while the glue dried.)
Then I glued on a 4-in. coupling and then a 2-in. reducer and slipped in the
2-in. PVC pipe to hook it up to the trap down in the crawl space. The 2-in.
floor drain just drops into the opening; there's no need to glue it because the
whole contraption is sealed perfectly. Now the drain lines flow into the deep
recess, so there's no need to worry about errant water wrecking the floor. It
— Travis Larson, Senior
some basics on working with PVC pipe, check out:
- Modify a Floor Drain to Prevent Flooding
- Tricks for Splicing Plastic Drain Pipe
- How to Connect a PVC Pipe to ABS Pipe