Aspire uses polyethylene bird netting (which is effective on building frontages) for proofing light wells, roof spaces, eaves, canopies and other areas used by pigeons, starlings, gulls and house sparrows. The tensioned system is made up of 2mm wire with anchors and intermediate fixings. The main anchor fixings are attached to barrel strainers which in turn are tensioned. The net is then tensioned using stainless hog rings. Systems like this can last up to 10 years.