Imagine you’re trying to keep out a very small, very determined ninja. Spiders can squeeze through gaps the width of a credit card, so check your doors, windows, and the sad gaps where pipes enter your walls. Use caulk or weather stripping like it’s your job—spiders don’t pay rent, so you owe them zero hospitality.
One study found that the common house spider can flatten its body to a tenth of its normal height. That’s not a spider; that’s a liquid arachnid. So yes, you need to seal those tiny cracks under baseboards too.
