Abstract: A weep hole insect barrier is provided for existing and new construction that prevents insects from crawling into cavity walls in a typical house through weep holes. For existing construction, the insect barrier has a flap hinged to a frame. The frame is then secured to the outside of an existing weep hole. The flap contains a screen which prevents insects from crawling in while allowing moisture to escape from the cavity walls. For new construction, the insect barrier also has a flap hinged to a frame, but the frame has two portions, a first portion containing having a flap and a second portion containing a fixed screen. In this embodiment the frame can be secured within the weep hole.