Most Meridian homeowners don’t go into the attic often, so spiders up there tend to go unnoticed until someone pulls down the ladder to get the holiday boxes and walks into a web. Attics give spiders what they need: quiet, shelter, few disturbances and a steady supply of insects that come in through vents and gaps. A few spiders aren’t a problem, but heavy webbing and lots of egg sacs usually point to a bigger insect problem or gaps that need sealing.
Here’s why spiders settle in Meridian attics, which ones you’re likely to find and what keeps them out.
Why Spiders End Up in the Attic
- Food. Boxelder bugs, stink bugs and other insects crawl into attics in fall to spend the winter. Spiders follow the food. Our post on insulation bugs in roof cavities covers the insects that end up there.
- Access. Gaps at soffits, gable vents with torn screens, roof returns, plumbing vents and where the roofline meets the siding all let spiders and insects in.
- Shelter. Rafters, insulation, stored boxes and seldom-disturbed corners make good web sites.
- Seasons. Spiders move up in late summer and fall as nights cool, and attic spaces stay mild enough on sunny winter days for them to stay active.
Spiders Commonly Found in Meridian Attics
- Common house spiders build tangled cobwebs in corners and along rafters. Harmless to people.
- Cellar spiders have very long, thin legs and loose webs. Harmless.
- Giant house spiders and hobo spiders build funnel-shaped webs and are more often found in lower parts of the house, but can turn up in attics.
- Western black widows prefer undisturbed, sheltered spots and can be found in attics, especially around stored items. A bite needs medical attention.
Brown recluse spiders aren’t established in Idaho, though they’re often mentioned. Our spider identification guide can help you sort out what you’re seeing.
Signs of a Spider Problem in the Attic
- Webs across rafters, around vents and over stored boxes
- Round, papery egg sacs tucked in corners or along beams
- Lots of dead insects in the insulation or on window sills below the attic
- Spiders showing up in upstairs bedrooms or closets near the attic hatch
Keeping Spiders Out
Seal entry points
- Check and repair screens on gable, soffit and ridge vents.
- Seal gaps around plumbing vents, exhaust fans and wiring that pass through the attic.
- Close gaps where the roofline meets siding and at fascia boards.
- Weatherstrip the attic hatch or pull-down stairs.
Change the conditions
- Seal the outside of the house before fall invaders move in, which cuts off the spiders’ food.
- Store items in sealed plastic bins rather than cardboard.
- Check ventilation so the attic doesn’t hold moisture.
- Vacuum webs and egg sacs when you’re up there, wearing gloves and a dust mask.
A Quick Attic Check Each Fall
Once a year, ideally in late summer, take a flashlight up and look along the soffits, around each vent and at the base of the roof deck for daylight coming through. Check vent screens for tears, look for dead insects piled near the vents and note any droppings or nesting material, which point to mice rather than spiders. Fixing what you find before October keeps both insects and spiders from settling in for the winter.
DIY vs. Professional Help
Store-bought sprays kill the spiders they hit but do little about egg sacs or the insects that keep bringing spiders back. Foggers don’t reach into insulation and crevices well and aren’t a good fit for attics. Working in an attic also brings its own risks: stepping between joists, heat in summer and disturbed insulation.
A technician will look at how spiders and insects are getting into the attic, treat entry points and the outside of the house, and focus interior work on the cracks and corners where spiders hide. Sealing and seasonal treatment of the exterior go a long way toward keeping attics clear. Our posts on keeping spiders out of attics and spiders in attic insulation go into more detail.
Common Questions
How quickly can spiders come back after treatment?
If insects can still get in, spiders will follow within weeks to months. That’s why sealing and treating the outside matters as much as treating the attic itself.
Are attic spiders dangerous?
Most aren’t. Black widows are the exception, so wear gloves when moving stored items and don’t reach blindly into dark corners.
Do spiders damage insulation?
No, but heavy spider activity usually means there are a lot of insects in the attic, and gaps that also let in other pests, including mice.
Spider Control in Meridian
Spiders are part of our regular residential pest control plans, along with ants, wasps and hornets, mice, rats and fall invaders. We offer quarterly, bi-annual and one-time service. Quarterly service plan customers get free return visits. No contracts; cancel with 30 days’ notice. Rodent service is included at no extra cost with quarterly service plans; traps and materials are billed separately. We also service commercial properties, including offices and multifamily buildings.
ProGuard is based in Eagle and serves homes and businesses in Meridian, Boise, Nampa, Star, Caldwell, Middleton, Emmett and Garden City. Call (208) 352-2062 or contact us to schedule an inspection.