This is an ongoing saga ... I'm getting closer and closer ... :-)
I inhabit a small brick bungalow, built in 1954, poured-concrete foundation, about 800 square feet. Perhaps twice a year we get hard/fast rains (i.e. 3" in 12 hours) which cause a hydrostatic water problem in the basement. The water "pushes up" from underneath the basement floor.
I need to specify/install both a sump pit and a sump pump. I am modestly competent (not expert) at such DIY projects.
The sump pit will be about 24" in diameter and about 26" deep. I will place the edge of the pit about 15" from a wall. I've drilled 2 holes thru the basement floor: it appears to be (surprisingly) only about 2" thick. I currently *hope* to be able to cut the hole with a 'diamond' blade on a standard-duty circular saw.
I'd love to be able to bevel-cut a square hole so the bevels would support the pad (with the sump basin in the middle) I'm going to pour. Not practical?
What kind/grade of concrete should I use? I *hope* to be able to walk on the .5+ " (thick) lid that I will cut. Strength and adherence are the highest priorities.
What should I backfill with and where can I commonly get it? "Crushed stone"? Gravel? From Home Depot or ?
The basin tapers from 22" diameter at the top to about 16" at the bottom, and is 23" hi. I'm thinking of drilling 3 rows of .5" holes starting about 1" above the top of the pump. I have some waterproof wood glue that _might_ be suitable for gluing fine nylon mesh outside the holes (to keep larger particles out). Other suggestions are welcome.
I'm looking at a 1/3 hp Flotec submersible pump with a vertical-float switch (instead of "the ball"), and an in-line Flotec hose-type check valve. I've heard the hose-type connection reduces vibrations.
Right next to what will be the sump pit is a washing machine, discharge from which is routed to a floor drain with 1.5 " PVC. I hope to integrate the discharge from the pump (this conforms to local code). Any reason not to do this?
I am still uncomfortable re mounting of the pump. Folks say put 3" of gravel or a couple bricks in the bottom of the sump basin and rest the pump on top of that. I need to be able to remove the pump easily for maintenance /repair. Should I just cut the PVC coming out of the basin and use a small hose section and clamps to make it removable? Are there issues with stability, vibration, etc??
Any/all info/suggestions are welcome.
Muchas Gracias, Puddin'