dmcutter
Contributor
We have a 9 ft diameter riser made out of precast sections with tongue and groove joints, with mastic and Hydrotite water stop in the joints. We lost the waterstop at a joint about 14 ft down and it's losing about 40 gpm. We need to seal the joint from the outside. The joint is about 1/2" high and 4" deep. We plan to stuff oakum into the joint and then seal around the circumference with some type of cementitious material. All the materials we have been looking at, e.g. Ram-Nek, need to be applied in the dry, which obviously won't happen 14 ft down. We are looking for something that can be mixed at the surface in a boat and then lowered to us, so it needs to have a working life of somewhere around 10 minutes and needs to be appliable by hand or hand tools. All the swimming pool repair product makers tell us their stuff won't work with 14 ft of head. Anyone have a specific hydraulic cement/plug/marine caulk that they can recommend?
Thanks
Thanks