Hello I am Ken From KP Carpentry. Can you tell me more about your built in project? Do you have a design in mind? How big is the area? Can you take a few pictures of where you would like it to go?
not sure about the product used in your home. we usually pack the joint with oakum. then we use hydrolic cement (water plug). followed by tar on the outside. hope this helps. email with any questions. ... read more