It can be puzzling when spiders start getting into your home, especially if you see large wolf spiders. How on earth does a big spider like that get into your home? The reality is that your home can have many entry points that you don't know about—even entry points that are large enough to allow a wolf spider in. These entry points are difficult for you to see but easy for a spider to find. Spiders have no problem crawling underneath your back deck, scaling your foundation walls, and finding a rotted hole or gap to squeeze in through. They can also get in through openings that might be in clear view. If you make it dark in your home, examine an exterior door and see if you can see the light shining in. Those are gaps that a spider might be able to use to get inside your home. The secret to keeping Merrimac spiders out begins with addressing these potential entry points.

spider in basement
spider on spider web

Address Entry Points Spiders Use

Some spiders get in through low entry points. Some spiders get in through high entry points. There are the rare few that use both. It isn't easy to get high entry points sealed, but we mention them so that you are aware of them.


If you have gaps around your doors, there are a few solutions. 

  • Old weatherstripping can be taken out and replaced. This isn't too difficult for most doors.

  • If you have a gap at the bottom of your door, you need to replace the door sweep—or install one if you don't have one.

  • If you have holes in your door frames, a caulking gun can give you a temporary fix.

  • That caulking gun will also help with gaps around the outside of the door frame.

  • If there are holes or rips in your screens, those should be repaired.

  • Check for gaps between your screens and your doors and seal those gaps.

  • If you have a sliding glass door with a damaged pane, make sure no cracks are large enough for a spider to infiltrate.


The same methods used to fix your doors will apply to your windows as well. Typically, windows are a more difficult entry point for spiders to use. They don't have as many vulnerabilities. But windows are often opened and left open. Even with a screen, this can increase your chances of having a spider slip in.

Rotted Wood Holes

There are many areas of your home that can be rotted. A caulking gun or some expanding foam can temporarily patch many of these problem spots. 

Closely examine and evaluate areas of your home where the ground stays damp. In these spots, you could have rotting wood just under some siding or under a structure.

Do a thorough examination of your exterior deck or porch if you have either of these. If these structures are damaged by wood rot and wood-destroying pests have further damaged them, you could have entry points a spider can use.

Get into your crawl space if you have one. This area of a home is notorious for high humidity, wood rot, and entry points.

Exterior Penetrations

If you have any objects that penetrate your foundation walls or exterior walls, these can provide pathways for spiders. Apply a seal around pipes, PVC wire conduits, and utilities. If you have an air conditioning unit, make sure there are no gaps around it.

Vents and Exhaust

If you don't have adequate protective screens or covers for your vents and exhaust, these will be perfect entry points for spiders. Also, consider getting protectors for your weep holes if you live in a brick home.

General Spider Maintenance

Once you've done your best to address entry points, there are a few ways you can reduce spiders around your home.

  • Remove webs as soon as you detect them. A spider's egg sac on a web can have 300 spider eggs in it.

  • Remove objects that are near your home. Spiders like to hide under these.

  • Remove leaves, wood, and sticks.

  • Make sure your trash is bagged and in sealed containers. This reduces flying insects, which are an important food source for spiders.

  • Address conditions that cause standing water. Puddles and containers provide water for spiders.

Roof Penetrations And High Points Of Entry

Skylights, exhaust, chimneys, and other roof penetrations can provide ways for spiders to enter your home. They can also get in through gaps in your roofline, soffits, and fascia. A caulking gun and some expanding foam can seal most openings, but it might be difficult to get up onto your roof and do a thorough job.

Targeted Pest Control

Once you've done what you can do, or even before you've rolled up your sleeves to do the hard work of keeping spiders out, consider investing in residential pest control. A year-round pest plan can reduce the food sources that attract spiders and help to keep outside pests from becoming inside pests.

Spider Management In Merrimac

If you live in Merrimac and you'd like to get started with a pest control plan, reach out to us. The service team here at Freedom Pest Control looks forward to helping you find the right solution for your Massachusetts home.


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