Why Do I Keep Finding Spiders in My House Even Though I Spray Every Month?

You’ve been spraying. Maybe you bought a can of something from the hardware store, or you’ve been using one of those bug barrier sprays around the perimeter, and you do it pretty regularly. And yet every few days you’re finding another spider somewhere in the house, on the wall, in the corner of the bathroom, running across the floor at night. So either the spray isn’t working or there’s something else going on that you don’t know about.

Spraying kills what it touches, not what comes in later

This is the core of why store bought spray feels like it’s not doing anything. Most consumer spider sprays work on contact, meaning the spider has to actually walk through or be hit by the spray for it to do anything. Once it dries on a surface, it loses most of its effectiveness pretty quickly, especially in Florida where the humidity and heat break down the residual faster than it would in a drier climate. So the spider you find a week after you sprayed probably walked in after the spray had already worn off, not because it survived the treatment.

Spiders are following their food source

Here’s the thing about spiders that most people don’t think about when they’re trying to get rid of them. Spiders don’t come into your house because they like your house. They come in because there are bugs in your house, and bugs are what they eat. If you’ve got ants, roaches, silverfish, flies, or any other insects getting in, you’ve essentially set up a buffet that spiders are going to follow. Spraying for spiders without addressing the bugs drawing them in is kind of like mopping the floor while the faucet is still running. You can keep doing it but the problem doesn’t actually go away.

Where are they actually coming in?

Spiders can squeeze through gaps that most people wouldn’t think twice about. The gap under a door that isn’t sealed well, a torn window screen, a small crack around a pipe where it comes through the wall, spaces around utility lines. They’re also excellent hitchhikers and can come in on boxes, bags, firewood, plants brought in from outside, or anything else you carry through the door. If you’re finding spiders in one specific part of the house consistently, that area is usually near a gap they’re using to get in.

What about the webs you keep knocking down?

If spiders are rebuilding webs in the same spots over and over, that tells you two things. First, that spot is comfortable for a spider, meaning it’s sheltered and near enough to a light source or air movement that bugs pass through it regularly. Second, knocking down the web doesn’t do anything to the spider itself, it just makes it rebuild somewhere nearby, usually in the same general area because the conditions that made that spot attractive haven’t changed.

Does spraying the inside even make sense for spiders?

For most spiders you’re finding inside, the better approach is treating the outside perimeter and addressing whatever is drawing them in from out there. Spiders tend to live and hunt near the exterior of a house before working their way in, so a barrier treatment on the outside that actually has some residual staying power is more effective than spraying corners inside the house after the fact. The inside spray might knock out what’s already in there, but it doesn’t stop the next wave from coming in.

Why does it seem worse in certain seasons?

Around here spiders don’t really have an off season the way they do up north, but activity does tend to pick up at certain times of year. When it’s been particularly wet, bug populations spike outside, which means spider populations follow. When temperatures shift even slightly, spiders start moving around more looking for stable conditions, and that movement often takes them indoors. So you might notice more activity after a stretch of heavy rain or during certain times of year without it having anything to do with whether you’ve been spraying or not.

Is there a point where this becomes more than just a nuisance?

For most of the spiders people find inside Spring Hill homes, the answer is no. House spiders, cellar spiders, jumping spiders, the big huntsman spiders that look terrifying but are harmless, none of those are a real danger. The ones worth paying attention to are black widows and brown widows, which do show up around here and which you’d want to deal with promptly if you’re finding them regularly. If what you’re finding looks like it has an hourglass marking on the underside or you’re consistently finding them in the garage or shed, that’s worth a closer look.

So what actually gets rid of them?

A combination of things done together tends to work better than just spraying. Addressing the bugs they’re feeding on, sealing up the obvious gaps they’re using to get in, knocking down webs consistently so they don’t have established hunting spots, and using a professional treatment that has actual residual staying power on the outside perimeter. Doing just one of those things usually produces limited results because the other factors are still in place.

If you’ve been spraying and still finding spiders regularly, our spider control service takes a look at what’s drawing them in, where they’re getting in from, and puts together a treatment that addresses more than just the ones you can see right now.