I am thinking of installing some around my house. I have a crawl space and
for the most part it stays dry other than after a torrential rain, then one
side of it get water in it.
I have read conflicting things on where exactly they should be placed. Seve
ral say right up against the foundation. I read in one place however that t
he drain should be 4-6 feet away from the foundation and that you are actua
lly inviting more water by placing it against the foundation due to the hyd
rostatic action of the soil.
Was wonder which was right and will it make a big difference?
it depends a great deal upon the soils around your
foundation as to what will work and what is a waste of
time, effort and money.
where does the potential drain go? do you have a
sump pump in the crawl space or a natural slope away
from the house you can use?
dig outside the wall that has the water and put the
drain slightly below the level of the footing and run
the drain pipe to your sump pump. do the french drain
along the wall properly (slope it enough, fabric around
the pipe, pea gravel then sharp sand). the wall itself
could be cleaned and sealed (tar it and then stick a
thick mil plastic on it) while you've got it dug out.
leave an access to the drain so you can check it
for critters if there are further problems.
+1+ on the OUTSIDE of the wall. Much better to keep water from going
through the foundation in the first place.
Unless the water is definitely coming up from below the basement
floor, and not from outside the perimeter, an internal french drain is
total stupidity in mnost cases.. Keep the water away from the
foundation (proper grading and gutters), then remove any water that
does get to the foundation level with an external drain, and
waterproof the OUTSIDE of the foundation with a drainage membrane -
and you won't ever have water trouble in the basement.
Ignore the rest and install an internal french drain, and water coming
through the foundation will progressively damage the
(there's a reason it's called a "french" drain)
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