Hey everyone! I'm in Minnesota and currently applying Kilz to my basement walls before I insulate. I've been on quite a journey dealing with mold in this space, including demolition, a drain tile and sump installation, regrading, and gutter work. I'm hoping those improvements will tackle about 98% of my moisture concerns, but I'm treating the Kilz as an insurance policy. My initial issue was a slow leak over the years due to hydrostatic pressure, which wet the studs and led to mold creeping down to the carpet. Now, with new framing in place, I'm wondering: should I paint the backs of the studs and sill plates with Kilz while I'm already doing the concrete? Is it a waste of time, or could it provide extra protection? Are there any downsides to this?
3 Answers
Kilz isn't a waterproofing solution, so if water seeps in, it can still affect the framing. It might give you a little peace of mind, but it won’t stop water damage. Keeping your sill plates off the masonry is crucial—using pressure-treated wood or some gaskets can help. There are best practices available online, especially from EPA and EnergyStar, that can guide you on insulation and moisture control better than older methods some contractors might suggest.
Definitely smart to follow modern guidelines. I had similar issues, and knowing the latest practices really helped me out!
Honestly, applying Kilz on the concrete might trap moisture, which is what you don't want. If your walls are open, it's better for airflow. That said, if you're set on using it, it won't hurt much, but just understand it won't block moisture infiltration effectively either.
That makes sense, but just remember that any paint will let moisture through, so it’s not a foolproof solution. Make sure your drainage is solid!
I get that concern! I'm applying Kilz on the blocks to kill any lingering mold spores and ease any future moisture buildup, especially since I have systems in place to manage water.
Kilz is overkill for what's needed! Since your walls are closed off, it's really more about moisture management. You want to ensure effective drainage rather than relying on a paint. If there’s any way water could seep in, you might be better off focusing on proper sealing and a membrane on the walls instead of painting over them.
What do you mean by 'inferior way'? I’ve done a lot of work on grading and gutters to manage water flow. Are you suggesting I switch my approach?
Yes, please explain! I've been following best practices and I'm curious about your take. Any tips you have would help!
Right! I really want to make sure I'm doing things right since I've had mold issues before. I'm using the mildew-resistant Kilz, so I'm hoping it can slow down any potential rot.