Final answer:
For attaching wood shingles to a roof, it is commonly recommended to use two fasteners per shingle. This ensures both secure attachment and allows for the wood's natural movement.
Step-by-step explanation:
The number of fasteners required per wood shingle for proper attachment to the roof can vary depending on the building code and the type of shingle used. However, generally, it is recommended to use two fasteners per shingle. These fasteners should be long enough to penetrate at least ¾ inch into the roof decking or battens. It is essential to place the fasteners in such a way that the shingle is securely attached to the roof but also allows for some natural expansion and contraction of the wood due to changes in moisture and temperature.