I have found Carpenter Ants on & near my sliding door in my 2nd floor bedroom. I have an outside deck off the bedroom & support beams are cemented into the home’s brick wall. On the underside of the deck flooring (outside from the ground) closest to the brick wall & the sliding door, the edge of my 3/4″ plywood flooring is visible. Also, the Deck Railings need to be completely replaced. There are places where they have rotted out. I have sprayed Carpenter Ant/Termite Insecticide repeatedly inside & outside. I have dead Carpenter Ants showing up near the sliding door inside. I am sure the Nest is either in the wall or in my 3/4″ sub floor. Would it be best for me to Dust with “Drione Dust” using a Crusader Duster w/a Long nozzle and drill a 1/8th” small hole in my sub floor to apply the Drione?

From the description you’ve provided, there is no doubt in my mind the DRIONE DUST is the way to go. In my experience, aerosol products can kill some of the ants active in the area which you’re no doubt seeing now as a result of your treating. But it won’t last long and has a tendency to get absorbed by the wood making it less than effective. This can happen quickly and in the end, leave the nest ready to rebound. Additionally, aerosols won’t penetrate deep enough compared to Drione and when it wears off too soon, offspring from the nest will enable it to continue on.

Drione, on the other hand, will both penetrate better and last longer. In many cases it can take care of the problem in no time. A good dusting with the CRUSADER should do the job. I don’t think you’ll need any kind of extension; the natural floating action of the Drione should get it deep into any of these voids where it needs to be.

Here are direct links to the information and products listed above:

Drione Dust:  http://www.bugspraycart.com/insecticide/dust/drione-dust

Crusader: http://www.bugspraycart.com/equipment/dusters/crusader