The following photo shows a typical termite rod used in the treatment of termites. The rod itself is hooked up to a spray rig which acts as a reservoir for the termiticide. Exterior areas require more chemical due to the fact that the soil from grade to the top of any footings needs to be fully treated.
Upon arrival a clients home I find she has rat droppings not mice. Downstairs I find a septic stack with a long elbow which is opened up on one end which used to service an abandoned toilet no longer in use. The end was capped and I even took a photo of the droppings inside with my snake scope camera. Rat issues can be simple or complex in this case her basement was open so that a quick observation could be made based on experience I could narrow the problem down quickly.
Back door flashing was removed and brown rub marks could be seen. This family had mice on and off for years because the mice simply squeezed through the loose material. It was screwed together and the gap in the wood cemented shut. The following example makes it clear how a different set of eyes on the same door resulted in this families successful rodent exclusion and prevention.
This hedge covers a window that even the new homeowner did not know existed because of the dense cedar. I knew there was a hole and found an old window. Not only was the hole stuffed with stainless steel wool I even double meshed it with deck screws and washers. I know its over kill but I never want to crawl in there again.
New home construction with this kind of overlapped notch are classic examples of mice entry points. I had to pull back vapour barrier and insulation untill I found it and matched the location to the pipe outside. Note the 2 droppings near the washer.
Once this hole was found and sealed the mice could no longer get in. I found it by noting the droppings from the basement notch out for the home framing.