Cat urine odor from encapsulated crawlspace- what can I do?

Michael clark
by Michael clark
three years ago I had my crawlspace encapsulated because of moisture and mold problems. After a year, a cat urine, chemical smell started coming up into the living area and the smell was and is now quite unbearable. The people who did the encapsulation said they have done hundreds and have not had any complaints. They claim it has nothing to do with their material since no one else has had a problem. My hvac system is not in my crawlspace. I have read where others have had this problem, but there seems to be no solution that I could see. Does anyone have any solutions or suggestions as the smell is not only troublesome but I believe can affect my families health as well. I live in Morehead, ky. thanks.
  6 answers
  • Janet Pizaro Janet Pizaro on Apr 24, 2017

    Not to sound rude but have you checked to make sure there are no critters in the crawlspace?

    • Jane Gito Jane Gito on Oct 15, 2019

      One of my 2 cats (both neutered males) had taken to painting all of my walls, furniture, and anything else he could reach. I was horrified when I got a UV light. He never did that in all of the 9 years I've had him and didn't when I got him a buddy (they love each other and did so right away) but when a strange black cat started showing up outside both of my cats went nuts and the older one (9) started his wall painting, as well as the curtains out in the kitty room. I couldn't keep up with it.

      My cats are indoor cats so it's not like the stray is actually going to get in here but they both hate him (and he is neighbor's cats hate him too). I've tried cleaning with a pet urine enzyme and then spraying some "No More Spraying" but that hasn't worked. He's a sneaky little bugger too; he waits until he thinks I'm not looking and then does it. He's learned that the minute I see him backing his butt up to something he gets yelled at.

      It wasn't until I found "Cat Spraying No More" that I was able to finally get rid of this tiresome behavior.

      Now my house doesn't smell like a litter box anymore :)

      Here's a link the their site if you're interested in checking it out:

      I hope you guys don't mind me sharing this. Have a wonderful day!

  • Michael clark Michael clark on Apr 24, 2017
    I haven't even had a mouse. as far as I can tell, there aren't even any bugs or spiders. I have a sani-dry dehu, as well as two sump pumps. the humidity stays around 49 or 50%.
  • Angela Ley Angela Ley on Apr 24, 2017

    I know this sounds like a strange question but do you have a front loading washing machine and is there a floor drain in the area ? We had a similar problem and found out it was caused from our front loading washing machine. A small amount of water seemed to stay in the machine and every time we did laundry we would get this strange urine type smell. Turns out is was from the left over water in the machine and the smell was coming through the floor drain. We would start a fresh load of laundry and the machine would cycle this small amount of water out at the beginning of the cycle and the smell appeared. Took us a long time to figure this out.

    • See 1 previous
    • Angela Ley Angela Ley on Apr 24, 2017

      Good luck with resolving your problem, I hope you find the answer. Try putting a box of baking soda in the area to help remove the odor perhaps ?

  • Zest it Up Zest it Up on Apr 24, 2017

    We are firm believers in using household products! Try distilled white vinegar and baking soda to remove the smell!

  • Beverly Walls Polito Beverly Walls Polito on Aug 10, 2017

    I have done a ton of research on this, it is probably coming from gas trapped under the plastic or the material itself. The only remedy I have read is to install a radon remediation system under the plastic to remove the gas and odors from the crawlspace, or remove it all together.

  • Tracy Woolery Tracy Woolery on Jun 17, 2019

    Call Crawl Space Ninja and ask Michael Church 865-659-0390