This control program is based on the exclusion of the bird through a plastic or stainless steel spiked device, installed and designed to occupy the current perching/roosting locations. Anti-roosting spikes are best suited for ledges, window sills, peaks of roof, horizontal beams, and signs.
Installed properly, the spikes occupy the space normally used for perching and roosting by the birds.
The anti-roosting spikes do NOT hurt the bird. It only prevents the birds from landing on your rooftops.
Simple in scope, the size of the spike must be matched to the species of bird.