We have been losing massive amounts of dirt over a known RCP drainage pipe. This pipe is 24" ID with typical tongue and groove joints as shown here:
here's the job and the question: I have excavated about 50 LF of overburden, exposing about 7 joints (more to go). What would you use to seal these joints?
Intentions at this point:
-Scrape, brush, and clean as best we can.
-6" wide heavy bed of plastic roof cement with reinforcing cloth imbedded.
-12" 22 gauge galvanized strip bound tight to protect the tarred joint during backfill.
Other thoughts:
9" Flashing tape. Either self adhered alone or as a cap over plastic roof cement. $2/LF - 10' /jointSonneborn HLM 5000 or similar. $70 / 5 gallon
Dollars for material have little meaning, just information.