I have a concrete block basement, and about 3' below the outside finish
grade, I want a 3" pvc pipe to pass through the concrete block wall, to
bring power and water lines from inside the house to a 48" trench that
will carry them to an outbuilding and a yard hydrant. What is the
proper method of sealing the wall to the pipe so that it will not leak?
Where my well water pipe and conduit pass through the basement wall,
they just grouted around them and in a heavy rain, they will
occasionally drip. I was thinking something on the order of putting a
4" hole in the block wall, putting in the conduit, and then filling the
surrounding space with grout, and tarring on the outside. Will this
work, or is there a better method?
its most important the area directly outside the penetration is well
you will get a leak no matter what you do if water pools there.
a drain line with gravel should do the job.
the sewer authority caused a problem after replacing a main sewer
it flooded basements along the route:( turned yards into a swamp:(, so
they dug up the line and put a perforated pipe alongside the existing
sewer line draining to a convenient stream.
think of the slope and terrain of your new ditch you dont want to
direct water towards your home.
hydralic cement is a gpood sealer, just put in hole then cement PVC
line in place....
I would drill separate holes for sanitary, water, electric, low
volt. I would install a slightly oversized sleeve of PVC or steel
for the intended pipe/wire. Grout the sleeves into the existing
wall. Apply emulsified tar or pitch to the exterior using nylon
mesh reinforcement. Multiple coats don't hurt. Install utility
through sleeve. Pack the annular space with backer rod and cap
with NP1 or other polyurethane caulk. Drainage gravel lower than
the penetrations that went to daylight would be great, but
probably not feasible. Make sure surface grade drains away from
Keep the whole world singing . . . .
DanG (remove the sevens)
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