Look at the box for the nail description. If it is not a common nail, ask questions. Take a few of the nails to the hardware store and compare them to a common nail. As soon as the sheathing nailing has been confirmed to be installed correctly, install the underlayment for the roof covering as soon as possible. The underlayment, which is typically black building paper, can protect the roof sheathing from rain.
Rain can cause the sheathing to delaminate or swell.
It is imperative that your contractor is aware of this, knows the steps that must be followed for good installation, and understands how deviating from code minimums or specifications can affect the performance of this critical connection. We cannot, however, guarantee the performance of all items demonstrated or described in all situations. Always consult an experienced contractor or other expert to determine the best application of these ideas or products in your home.