Plastic Headed Nails
You should generally allow for 2 nails or pins at 600mm centres (400mm for woodgrain fascia and soffit). This means that you will need 18 per board for white products, and 26 per board for woodgrain products.
We advise that you use 65mm Nails for Standard Fascia, 50mm Nails for Cover Boards, 40mm Pins for Plain & Vented Soffit and 30mm Cladding Nails for all External Cladding and Hollow Soffit.