What is the fastening allowance for vinyl siding in terms of minimum fastener length?

The minimum fastener length for vinyl siding is specified as 1 1/4 inches. This length is essential to ensure that the siding is securely attached to the building structure, allowing for proper adherence and insulation performance while accommodating the material's expansion and contraction due to temperature changes. Using the correct fastener length helps prevent issues such as sagging, blowing off in adverse weather conditions, and other structural problems that could arise from inadequate fastening. Proper installation is crucial to maintaining the performance and longevity of the siding, and the 1 1/4 inches standard is set to provide the best balance between secure attachment and material integrity.