Protect post-frame buildings from bird infestation with the BIRDBLOX Bird Deterrent System from ABC Advanced Bird Control. Roof trusses inside pole barns and other post-frame buildings provide easy roosting and nesting places for birds. BirdBlox copolymer plastic strip barriers are easily installed on the 2X wood framing (2X4, 2X8, etc.) used in post-frame construction. The BirdBlox System is affordable, environmentally safe, requires no power and is humane, according to the manufacturer.