To Waterproof or Not Before Finishing Basement
I live in Northern Virginia. My house is on a small hill with one basement wall (front wall) totally below grade, 2 side walls partially below grade,back wall totally above grade. The foundation is poured concrete. House was built in 1990. I have a sump pump and it appears to be operating properly.
When I removed existing builders insulation from walls, I found 2 vertical cracks in the foundation, one in the back wall and one in a side wall starting from the edge of a basement window. The side wall crack has oozed a small amount of water during recent heavy rains.
I am going to improve the grading around the house and put in some extended downspouts to get the water further away from the wall sides. In addition, I plan on sealing the cracks with poly injection foam.
I am debating whether to expend the effort to dampproof/waterproof the interior basement walls and floor since there appears to be a debate about effectiveness of such treatments. Other than the water periodically oozing through the crack in heavy rains, I don't have any wetspots on any of the foundation walls. Assuming that I can improve the drainage on the exterior, is it worth the effort to use a product like Dry Lok, RadonSeal or Sani-tred to waterproof the interior walls? If so, which product would be easiest to apply and most effective?
I also have both hairline and larger (1/16") settlement cracks in areas of the basement floor that have not let in any water (all are in the portion of the basement totally above grade)...should I seal the floor and those cracks also? If so, which product would be best?
At present my insulation plan for the basement is to glue XPS sheets on the concrete foundation, use metal studs to build the stud wall with fiber batts in between the studs. I am contemplating whether to use dry wall or Dens Armor Plus product to finish.
I'd really love to be able to use a product that allows you to remove the wall panels but haven't found one yet (would be nice if Owens Corning sold their basement finishing system to DIYers). If anyone knows of such a product, would love to hear about it.