What is the required fastening method for wood decking in exterior applications?

The required fastening method for wood decking in exterior applications emphasizes both secure attachment and durability. Using two No. 8 woodscrews or two 8d nails provides the necessary strength to keep the decking securely in place as it withstands various weather conditions and potential stress factors such as foot traffic and changes in temperature.

Woodscrews are advantageous because they offer better holding power than nails, reducing the risk of loosening over time. Additionally, using two fasteners ensures that each board is sufficiently anchored to the underlying structure, which is crucial in outdoor settings where movement and expansion can occur due to moisture and temperature fluctuations.

While the options involving single nails or a combination of nails and screws do not provide the same level of security or reliability, the selected method covers the requirements for both adherence to code and practical application in a way that maximizes the lifespan of the decking materials.