I posted some related topics recently regarding my sewer line drainage, and
based on the responses and my own research I have decided on a repair
method. Now I need some advise on my next step.
My laundry drain pipe has a crack, the crack was determined by sending a
flexible tube with a video cam attachment down that pipe. Then we measured
the length of the tube and it was about 29" from the mouth of the standpipe
to the location of the crack. The crack caused sand to be pulled into the
pipe as we do laundry and water rushed into the pipe. This sand will piled
up downstream where the laundry line meet up into the main line around a
"bend" and clogs up the line occasionally.
The washer is located in the garage. On the opposite wall is the kitchen.
The location of the crack is about 10 inches to the kitchen side where the
cabinets are located. It is a single story house on a 8" concrete slab.
Breaking up the tile and breaking the concrete slab in the kitchen and
ripping out the cabinets will be too much work. The drain company who did
the video inspection (xxx Rooter) recommend handling from the outside.
This means digging a hole from the side, and a tunnel about 6 feet in length
to access the pipe, replace a section, then back fill.
I looked at the plans of the house, the concrete slab on the edge has a
footing 3 feet deeper than the rest of the 8" slab. This means they have to
dig three feet deep to get to the bottom, and another 4 to 5 feet for
someone to access horizontally unless they are going to crawl over. That
will be a 9' deep hole? I think this is lower than the water table. I
asked them and they said it's not a problem. The tunnel itself will be six
feet in length to get to the pipe. Also as they dig out the dirt (which is
mostly sand since we are in south Florida a mile from the beach), the dirt
below the slab and above the footing line will drop down, that seem like it
will be a hugh pile of dirt/sand to dig out. Once the pipe can be accessed,
it seems it will be straight forward to fix the actual pipe.
One question I have is after the pipe is fixed, how can they put the dirt
back in, especially the pocket of area above the footing, there is no way to
put that back right? I heard some time ago there are companies that will
inject concrete mix under a slab to fill out air pockets?
and finally, what type of professional do I need to do this job which
involve plumbing, trenching, excavation, tunneling, back filling... will it
be a plumber? a drain rooter company, a general contractor, or some other
specialists? The rooter company estimate for this is between $2500 and
$3500, so this will also require permitting.
Thanks in advance for any comments.