Generally, an application located in the upper and lower corners of the different parts is sufficient. When the population is larger, a liquid insecticide should be sprayed on the exterior surfaces of the house. Nevertheless, spiders are useful organisms because they destroy a large number of insect pests. It is therefore better not to destroy them unless they become too numerous, and consequently embarrassing.
Keep windows, doors, cornices etc. outside contours sealed as possible.
Use incandescent yellow lamps instead of soft white (blue) light on the outside.
Do an insecticide spot treatment inside.
Apply an insecticide to the outside perimeter of the house as well as to the outlines of the doors and windows, if there is a lot of infiltration inside.