QFI Roofline Specialists Bird Guard provides an effective barrier which prevents birds from entering your roof space and nesting thereby providing suitable ventilation. However, when installing bird combs, it is vital to ensure that it is done professionally to prevent any alignment problems. At QFI Roofline Specialists, we know how important it is to prevent birds from entering and nesting. Our Bird guard system ensures that an adequate barrier is created against birds and vermin.