
On older buildings or where the most discreet bird deterrent system is required to protect sills and ledges, pin and wire systems are the most appropriate. A series of stainless steel pins are attached to the ledge, either by being drilled into the stone using a 6mm rivet or by being glued using a purpose made base. Between the pins 0.8mm stainless steel wires are sprung. The sprung wires are set up in rows depending on the width of the ledge.

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