I’ve been seeing large black carpenter ants in my garage. It’s a free standing garage and has open walls inside so there isn’t any place to hide. But I’m not seeing on those walls. Instead I’m seeing them climbing on the outside roofline and on the gutters. I think they might be nesting under the roofing. What would be the best product if they’re up under the rooffing?
Carpenter ants like to live in any protected space they can find. Roofing shingles offer a great place for them to nest. Typically moist with a lot of seams and cracks, they’ll easily get up under the shingles and from there can find spaces where they’ll create thriving nests.
The best product to use for this area is the Drione Dust. It will penetrate and reach all the voids up under the roofing when applied with a Duster. Liquid sprays won’t be too effective since they’re readily absorbed by the asphalt shingles and since this area is typically out in the open, the sunlight will quickly break the chemical down. Treat with the Drione as explained in our article about Carpenter Ant Control and you’ll be able to kill the nest immediately.