Cost to replace main drain pipe?

Question

Just looking for an estimate for replacing the main cast iron drain pipe. Current pipe just developed a leak and the entire pipe is rusty. The pipe is fully accessible from the basement, but does run through the basement concrete block wall to the septic system. Does this sound like a $500 or $2000 repair? Can we replace the leaky section with PVC to lessen the cost?

Answer 1

Surface rust is nothing on a iron pipe with 1/4 inch walls. Is it leaking at a hub, where 2 sections meet? Leaking at the hub can be repaired with new lead packing at the joint. Do you suspect water backing up in the pipe from a clogged septic system, that would be a worse problem. You can replace a section with pvc, iron can be more difficult to fit in. A 4-5 foot section should cost much less than $500 to replace,more like $300- $400. First check the septic to be sure it isn't backing up.  Don't get ripped off by a plumber!!!

Answer 2

PVC pipe is the choice for most people.  If you are replacing the whole system, $2000 sounds appropriate.  If you are just replacing one section, be advised that PVC pipe has a different outer diameter, as opposed to cast iron.  You need special adapters to mate the two dissimiliar pipes to each other, so that there won't be any leaks.  A rubber boot, or FERNCO coupling, is not an approved connection, inside a structure.  Good luck