Ants coming up thru the floor?


My sister has a beautiful home with a large screened in patio room. The floor is wooden plants and the ants come up from under floor. Is there some type of spray foam or something to spray either under or on top to make the floor solid so the pesky ants can't come up? They love to eat on the patio, but fight ants. They have sprayed home defense, but they keep coming back. Thanks in advance

  17 answers
  • William William on Jun 12, 2020

    Simple solution would be to glue and screw plywood to the planks. To kill the ants you would need to go underneath and heavily spray hoping you get any ant hills.

  • Mogie Mogie on Jun 12, 2020

    Ants invade a porch for three reasons: there is food there, it is a path to food or it is near their colony.

    Sweep the porch and remove anything portable that's attracting the ants, such as a garbage can.

    Place ant baits near the colony or on the porch. The ants will carry the poison into the colony and kill off the population.

    Follow the ant trail to find the path they're using to invade the porch. Sprinkle black or cayenne pepper along the path. Also, sprinkle the black or cayenne pepper around the perimeter of the porch and on the ground surrounding the porch. Pepper agitates ants' senses, so they stay away from it.

    Spray glass cleaner on ants when you see them on the porch; this will instantly kill them.

  • If you have sprayed and they are still coming in, I would recommend a professional pest control guy. They have stronger chemicals. The other issue is the floor. How big are the gaps they are coming through. If they are not to big you could try and seal the gaps.

  • Redcatcec Redcatcec on Jun 12, 2020

    When we have ants coming in it is the worker ants looking for food, this happens every year about this time. We set up ant bait called Terro (available in diy stores) on small pieces of cardboard, the coated non-porous type. Place it in their parades or where you see some entering.The Terro box gives you some squares, but you can easily make your own. The ants take this back to the colony and it kills the colony.

    Another thing you can do is dust where they crawl with DE (diamateous earth), be sure to get the food grade, also at diy stores. This destroys their exoskeleton.

  • Anne Tyerman Anne Tyerman on Jun 12, 2020

    Sprinkle cinnamon where they are coming it works a treat.

  • Ants will find the tiniest crack to make their way in if there's food. Usually there is a source that needs to be eliminated. We've been able to keep them out with cornmeal. I didn't think it would work, but it's magic.

  • Em Em on Jun 12, 2020

    This is the best stuff on the market. A few dots in the path of the ants and they carry it back to the colony where it will kill the queen. If you use topical sprays it only kills the worker ants and the queen will just make more. You can get it on Amazon.

    Optigard Ant Bait Gel offers unparalleled control of a broad spectrum of ants, including Argentine, carpenter, ghost , and other nuisance ant species, by ingestion and transfer of the bait, providing efficacy against the entire colony, not just the workers. Optigard can be used for both clean-out and maintenance.

  • Hi Peggy - Those little buggers are relentless, aren't they?!? This is the most effective method and all-natural spray DIY that we use with ants. It's best indoors, but will also work outside with more frequent applications. It's even been featured on Hometalk! Hope this helps! Hugs, Holly

    PS - We have a FREE eBook with recipes for all of my homemade and all-natural cleaners. You can download it here -->

  • Cheryl A Cheryl A on Jun 12, 2020

    We live on a small lake and we have ants in all sizes that come onto the deck, screened in porch and house. I have found that Ortho Home Defense is the safest and best spray for ants. I use it all the time and it kills them instantly - follow instructions on the back and spray under the porch and on the porch and your ant problem will be solved. You can buy this at Home depot, Walmart, etc

  • Kmdreamer Kmdreamer on Jun 12, 2020

    You will have to spray every year but 2 years ago my husband had a bad batch of wine that turned to vinager so I told him to dump it around the whole foundation for bugs we have not seen a ant in 2 years and we had them coming in the house carpenter ants tini ants Not one this year eather this is year 3. So use white vinager spray a healthy amount all around the house and all under the deck

  • Kmdreamer Kmdreamer on Jun 12, 2020

    I’m sorry the doller store has large bottles of vinager for cleaning try that

  • Kathy Gunter Law Kathy Gunter Law on Jun 12, 2020

    I would spread diatomaceous earth underneath and around the edges of the floor. Sevin granules are good on mounds as well. Both of these products would be fine around eating areas as they have little to no scent. Diatomaceous earth is safe and is still effective if it gets wet, as long as it isn't washed away. It would be my first choice.

  • Vimarhonor Vimarhonor on Jun 12, 2020

    Hello. I highly recommend the commercial products made by Terro. If you look over at the reviews and QA on Amazon and see how highly rated the traps are.

    I have been using them both indoors and outdoors - and been very successful in my overall situation. Additionally- I sometimes do an exterior Home defense foundation perimeter type product as well for spiders. Hope this helps.

  • Joy Elizabeth Joy Elizabeth on Jun 13, 2020

    We have ants galore, as we live in the woods. Advion ant gel works absolute wonders at eradicating them! You just need a tiny bit wherever you see them coming in.

  • Betsy Betsy on Jun 15, 2020

    Hi Peggy: This is what I used for my ant problem, it may work for you, too.

    Make a mix of 1/2 baking soda and 1/2 powdered sugar. Mix well and put around the spots they are in your garden, or inside your home, it's harmless to people and pets. For outside use, you can put it in a bottle, like a pill bottle or something like that. Cut a hole on the edge of the cap, and lay the bottle on it's side so the ants can come in and get the mix. This way, it stays dry if it should rain. They will take it back to the nest and it should kill them. I'd keep it out there all season if you can. The mix makes a gas and the ants can't pass gas, so it kills them. Anything else that eats it will just taste the baking soda and say "Yuck" and walk off. It won't hurt anything that can pass gas, so it's completely safe. It helps to know what type of ant you are trying to get rid of, too. Try this site, scrolling down to see the different types of ants and how to deal with them. Good luck.

  • Christine Anne Pieper Christine Anne Pieper on Jun 19, 2020

    I use: 2 c distilled vinegar, 2 c water, 3 TBS. Dawn, 3 TBS salt and mix it all together and put in spray bottle. Good luck!