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underground pipe question - Page 5

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Posted by wp on January 13, 2006, 2:38 pm
As I mentioned earlier, I had been doing a bunch of trenching for
drainage this past year, hoping to get the last bit by the house this
Spring.  I've got about six inches of soil and nothing but clay below
that, so I've been making sure that the bottom of the trench tips
towards my daylight opening and just to make sure, I installed 4"
perf. pipe surrounded by 12" of 2" stone.  This was wrapped in filter
fabric and then I backfilled with gravel and sand.  After doing a
bunch of research and talking to several local contractors this seemed
to be the best way to get good drainage.  I would think that with the
insulated pipe (whichever way I go) it would be much the same except I
probably would use a 3" - 4" layer of 2" stone under the pipe assembly
with a layer of sand for protection, then the pipe assembly wrapped in
a double layer of 6 mil poly and then sand over and around that.
After that I would probably backfill with some decent gravel or sand.
My idea would be that keeping the water from just sitting in the
trench (as it will drain to a daylight opening) will help protect from
rotting and also minimize the movement due to freezing soil in case
the frost went fairly deep.  I'm no expert, but it seems logical to
me.  Anyone with more experience might have some different insights.

On Thu, 12 Jan 2006 19:37:13 -0500, "SolarFlaire"

Posted by Anthony Matonak on January 13, 2006, 5:23 pm
wp wrote:

I'm no expert but your plan seems reasonable to me. I'll make the
suggestion that with 100 feet of pipe you may want to explore using
a contractor that does spray foam rather than paying $ a foot for
something off ebay.


Posted by wp on January 14, 2006, 12:57 am
 That sounds like a good idea Anthony.  There's not much call for that
type of work around here as it's mostly rural, but one of the local
insulation companies might be able to do it.  I'll check it out and
compare prices.  Thanks!

On Fri, 13 Jan 2006 09:23:05 -0800, Anthony Matonak

Posted by Gary on January 14, 2006, 1:54 am
 Anthony Matonak wrote:

I think that sounds like a good idea, but one thing to check on might be weather
the spray in place foam will hold up to what could be a continuously moist
environment.  I decided on the XPS extruded foam because it has a history or
working for insulating foundations and under slabs.  I don't know that the foam
in placy polyurethane won't work, but worth checking on.



"Build It Yourself" Solar Projects

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