Signs of a spider problem: false smoke alarms

Is your smoke alarm going off unexpectedly, even when there’s no smoke or fire? Some homeowners have discovered an unusual culprit lurking inside their alarms—spiders in smoke detectors. But can a spider really set off a smoke alarm? Let's take a closer look at how this might happen.

Can spiders set off smoke alarms?

Yes, there are cases of spiders setting off smoke alarms. But how can a spider set off a smoke detector? These small pests may crawl into the detector in search of shelter or be attracted to the warmth and light inside. When a spider moves across the ionization sensor in a smoke detector, the alarm can mistake this for smoke or a fire, causing a false alarm. Spider webs or debris left behind by spiders can also interfere with the sensor, causing the alarm to go off.

How to stop spiders setting off your smoke detector

If you have trouble with spiders setting off smoke alarms on your property, there are steps you can take to prevent it from happening again. Keeping your smoke detector clean and free from webs or dust can help reduce the chance of false alarms. Here’s what you can do to keep your alarm functioning properly.

1. Vacuum the spiders out with an attachment

Start by using a vacuum with a narrow attachment to remove them. Carefully vacuum inside the unit, focusing on corners where spiders or webs may be hiding. This is an easy way to get rid of the spiders and stop false alarms. Take the battery out first, and always check to see if the alarm still works afterward.

2. Use compressed air to blow out any remaining dust and webs

After vacuuming, use a can of compressed air to clean out any remaining debris. Spiders often leave behind silk threads or nests, which can interfere with the alarm's sensors. A quick blast of air will help clear out hidden webs.

3. Wipe down the outside of the unit

To further reduce the chances of spiders setting off your smoke alarms, wipe down the exterior of the detector with a dry or slightly damp cloth. This helps remove dust and potential attractants that could draw spiders inside.

How to get rid of a spider problem in your home

• Use a vacuum to suck up spider webs, spiders, and egg sacs. Spiders hate it when you disturb their home.
• Keep your landscaping manicured, mowed, weeded, and debris-free.
• Use screens on all windows, doors, and chimney vents.
• Eliminate their food source. If you have spiders in your home, other pests may be the source of attraction. Controlling other pests will encourage spiders to move elsewhere.
• Repel them with essential oils. Mix a few drops of essential peppermint, orange, or lemon oil in a spray bottle filled with water. Spray the solution wherever you see spiders, as well as around doorways and other spider entrances. However, note that these DIY methods may only work temporarily, if at all.

Spiders in smoke detectors are more than just a nuisance—they may indicate a larger problem. Common house spiders and many other spider species enter homes in search of shelter and prey, often feeding on other insects that have already invaded your space. Some species, like the brown recluse and black widow, are venomous and pose health risks due to their spider bites.

Contact a pest control technician to remove spiders

If you’re noticing signs of a spider infestation in your home or notice a dangerous spider, contact the spider control experts at Western. A technician will conduct a free inspection of hard-to-reach areas and entry points, like the attic and basement, and identify any issues. Set up your appointment today.