The holes are often located between bricks where mortar has fallen out under lap siding or in cracks in stucco.
Ants behind vinyl siding.
As most of the posters said water or moisture is the reason they are there.
Ants nesting in dead branches use the limbs as a bridge to the house.
If winged ants come out of crevices around your home this is a strong sign that you have a serious ant problem.
If you frequently see ants in the same area on the siding there s probably a nest in there.
Trim trees and bushes that touch a home s roofing and siding.
If you have a serious carpenter ant problem you may find wood shavings underneath your siding.
No animal insect or bacteria likes bleach.
If it can t be found once you pull the siding you ll need to find some other way to locate it and get the dust in there.
If you notice the ants carting off their eggs then they are moving out.
Unlike termites carpenter ants do not actually eat wood.
But with carpenter ants you really need to find the nest which is probably in wood somewhere underneath that siding.
Examine your foundation for cracks and tightly seal.
Unfortunately it also gave cover and safe harborage to many pests.
The problem with treating pests that lodge behind this shielding is that it gives you very little access to inject anything meaningful.
How to get rid of ants begin with looking for holes in the siding where ants are crawling in and out.
They burrow into it to make their nests so they leave behind a wood dust.