There is a group of spiders we call common house spiders. In this group of spiders, there is one type of spider that bears the name common house spider, which makes it a little confusing when talking about them in the plural. This spider goes by other names too. It is known internationally as the American house spider and it is known scientifically as Parasteatoda tepidariorum. For the purposes of this article, we'll refer to it as the American house spider. Here are three reasons why you have American house spiders inside your American home.

1. You Let Them In.

There are many pests that can chew their way into your home. Spiders aren't one of them. They need to find an entry point in order to get in. Here are a few common entry points these common spiders use to get into Pittsburgh homes.

  • When a screen is damaged, an American house spider is likely to create a web between the screen and the window. When the window is open, the spider can crawl inside. It doesn't take much of a hole for one of these spiders to get past a screen. Male American house spiders can be as small as ⅛ of an inch and females can be as small as 3/16 of an inch.
  • When a sliding glass door screen is damaged, American house spiders develop webs in the corners of the interior, often near the corners of the frame, and crawl inside when the door is slid open.
  • When door sweeps or weatherstripping are damaged or missing on exterior doors,  American house spider can slip through. But these entry points are most often used by wolf spiders and other spiders that feed on ground-dwelling bugs.
  • When a foundation has a crack or there is a gap around pipes or wire conduit, American house spiders will take advantage of them. These tiny spiders often create webs in bushes and other vegetation in landscaping. This brings them close to foundation walls where they can spy a crack or gap and slip right through.
  • When wood-damaging pests chew holes in the sills of your home or in door and window frames, these spiders will be quick to take advantage of them.

2. There Is Another Infestation In Your Home.

All spiders that get into your home are looking for food. If you have spiders in your home, it usually means you have a food source. This could be a sudden and somewhat temporary infestation of fruit flies or it could be a long-term presence of several insects. The more insects and invertebrates you have in your home, the more spiders you're going to have. Numerous bugs around your home will also contribute to your interior spider populations. Reducing moisture and other factors that increase bug populations will help you reduce spider populations as well.

3. You Don't Have a Pest Plan.

Homes that have lots of spiders don't have a residential pest control plan because a good pest control plan works to keep spiders out by significantly reducing the bugs spiders feed on. Pest professionals also use direct methods to deter spiders, such as the removal of spider webs around the exterior. This lets spiders know that they're not welcome around your home. At Witt Pest Management, we use modern Integrated Pest Management (IPM) methods to control household pests before they get in. IPM uses smart, eco-friendly pest control strategies first and a targeted application of EPA-approved products only where necessary. When performed by a licensed and experienced professional, this process is highly effective at controlling pests in a way that is natural.  

If you don't have a residential pest control plan yet, we can help you get one in place. Witt Pest Management is Pittsburgh's oldest and most advanced pest control provider. The methods and products we use are field-tested and considered by experts to be the most reliable and effective way to control pests. Find out why Witt is trusted by over 10,000 Pittsburgh Homeowners. While American house spiders aren't dangerous to your health or property, there are many other pests that are. We can help you manage pest threats. Contact us anytime. We're standing by to help.