Stinky wood porch

Recently purchased our home. We recently tore some OLD outdoor carpet off the back porch. Home had been vacant approx. 5 years. Old! Musty! Cat pee! Stained!
Have powerwashed. Still smells. Will sealing it with a solid stain help get rid of the BAD smell? Ideas and any help is appreciated. Thank you
  16 answers
  • Janet Pizaro Janet Pizaro on Sep 15, 2016
    Maybe try using bleach first to aid in the removal of the odor.
    • Jill Jill on Dec 01, 2019

      Sorry for chiming in a bit late to the discussion mate, but I really feel like I need to add my 2 cents.

      Cats don't just pee on floors and beds because they're in pain - could be a multitude of other reasons! Most common is that male cats feel the need to mark their territory.

      As for myself, I finally found something that works for the cat pee smell in my home! A herbal mixture of sorts! I now recommend it to everyone because it works so freakin' well and we save SOO much money!

      You should definitely check it out, we don't even buy Odorban and the likes any longer :)

      What a relief to finally have gotten rid of the horrible cat pee smell, and for a decent price as well.

      Registered an account only to say this:

      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 :)

      To be honest, I don't know too much more about it so I did a quick Google search and here's a description of the spray with a long review as well:

      No I have not been paid for this post nor do I make any commissions off of it. I really just want to help you guys out. I hope you don't mind.

      I'm based in Sweden, by the way, so you should be able to get it too.

      Good luck with the odor! It really lowers your quality of life, doesn't it?

  • Susan Susan on Sep 15, 2016
    you must dry the area very well with a fan. Then apply a stain/odor blocker sealer like Zinsser Mold Killing Primer. It is expensive but it works!!! It stops odours, kills mold etc. If the porch boards have spaces inbetween you will have to try to use a smaller brush to coat the edge of the boards. Good luck
  • Cindy Hagemann Cindy Hagemann on Sep 15, 2016
    Concrete is porous and the cat urine penetrates it. I have seen a recipe that include hydrogen peroxide, baking soda and dish soap - but I don't know if it works. The best thing would be for the sun to help air it out, if possible.
  • Jpy11082745 Jpy11082745 on Sep 16, 2016
    Stain and use polyurathane
  • Julie M Julie M on Sep 16, 2016
    white vinegar
  • Lee Lee on Sep 16, 2016
    You must clean your wood really well, before doing any sealing or painting. The reason why, it that the mold, mildew, bacteria, etc, are the cause of wood rot. If you seal over them, they will just continue to happily munch away at the wood under the paint. A gallon of water to a cup of bleach, will kill most of the micro organisms in the wood. Mop it on and leave it to dry in the sun. You might want to do this a few times. Then power wash. For the cat pee, white vinegar, full strength, works miracles on any nasty smells. All this washing and scrubbing, might raise the wood grain and leave your wood a little rough. But, a light sanding will make it smooth again. Your porch should look almost new, and be ready for the finish of your choice. Good luck, it's going to look great.
  • Raquel Raquel on Sep 16, 2016
    Wash it with white vinegar for better results scrub it in with a broom and use baking soda on badly stained areas
  • The smell is coming from bacteria from the cat urine, I would use a strong solution of bleach water. Pour it on, scrub in with a brush or push broom and let it stand for at least an hour. Wash with clear water. This should get rid of the smell by killing the bacteria. Once that's done you can paint it, seal it or leave as is. Good luck.
  • R Walter R Walter on Sep 16, 2016
    Might also think about what is under the porch. If there is dirt the urine possibly soaked thru and that needs to be addressed also.
    • See 1 previous
    • Susan Susan on Sep 18, 2016
      I totally agree with R Walter. If your house was vacant for 5years and your porch is high enough, there's probably been lots of critters under there peeing and pooping.๐Ÿ˜Š Now that you're living there it won't be so inviting for them. Can you run a rake under the porch? Then with all the cleaning solutions going through the porch boards, that should help. Maybe even spraying ammonia under there might help.
  • Piper Klausmeyer Piper Klausmeyer on Sep 16, 2016
    White vinegar and baking soda. Scrub scrub scrub!!!
  • Felecia Hernandez Felecia Hernandez on Sep 17, 2016
    Use Zinsser B-i-n primer odor blocker .Expensive but well worth the price . Used it after moving into a older home and found a corner that cats had urinated in !!
  • Pat Zagami Pat Zagami on Sep 17, 2016
    Try Grease Light . You can find it at most home improvement store ( like Lowe's ). I love this stuff.
  • Jpy11082745 Jpy11082745 on Sep 17, 2016
    Stain or paint, the cover with polyurathane
  • Galen W. Yoder Galen W. Yoder on Sep 17, 2016
    I'd certainly check under the the floor in the crawl space 1st and remove any possible problems there, and then put a good 6ml vapor barrier down. Unfortunately the amount of time that has occurred with the carpet trapping the cat urine etc in place I would not be surprised that the wood flooring may need to be replaced. If you pressure washed it you probably inadvertently re-activated the cat urine in the wood. Once wood has had an opportunity to soak in contaminates or stains, or chemicals it can have lasting effects. In my remodeling business iv'e had to deal with this in other areas such as long-term leaking toilets , under the kitchen sink cabinets, and shower or laundry room leaks that have soaked into the floors. Believe me each one has it's own " Wonderful" Aroma!! You didn't mention what kind of flooring, whether it was, solid wood boards, plywood, chipboard. Each type will have it's own side effects and odor holding power!
  • Tina Tina on Sep 20, 2016
    The vinegar idea will help with some of the odor issues, and Zinsser primer is awesome...but since this house has sat vacant for some time and the urine has had time to be become part of the will notice that the urine smell will come and go with temperature and humidity changes. it would be best to remove the wood if possible and start fresh.
  • Pat Zagami Pat Zagami on Sep 21, 2016
    Marine Varnish the only thing that will stop the odor. My friend had this problem and this solved it.
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