Upstate NY, new construction.
Working to install 4″ drain line from house to septic tank, approx total run of 60′. All the pipe is in, discovered after the fact that 2 lengths (20′ total) are foam core pipe. Helper picked it up at Lowes and apparently that’s all they carry now. I din’t notice it until after installed.
Is there a big enough difference in crush resistance to warrant tearing it out and replacing? Foam core sections are below grade 70″. Probably 2 hour job to replace.
My own house, I don’t want to ever have to dig it back up.
Thanks for any help.
Replies
bump
70" below grade?? What are you planning on backfilling with, and what might you drive over it? Doesn't seem like even a slight problem to me, but you could probably look up the crush resistance of both materials online pretty easily. Harvel Plastics has some pretty good product info charts on their site.
Not a problem. I did a scientifkally kontroled test on some 4" scraps laying around. Schedule 35 green and 35 white perfed.
Layed a 2x6 ramp on them and drove the front of My Toyota PU up on top.
Both pieces flattened out on top about an inch, then returned to round, mostly, when I backed off.
SamT
Praise the Corporation, for the Corporations' highest concern is the well being of the public.
If you properly bedded it, it won't be a problem at all. Once it is in place and bedded, pipe is hard to crush, once you have five or six diameters worth of cover over it, it becomes virtually impossible to crush.
But the key here is proper bedding. If the bedding is good and tight, to above the spring line, the sides can't go out, and thus the top can't go down.
There is a pretty good explanation at:
http://www.vinidex.com.au/VINIDEX/LIVE/RESOURCES/IMAGES/technotes/TN-12H.0.2000FlexiblePipeinRoadways.pdf
Thanks all.