What generally causes buckling in horizontal vinyl siding?

Buckling in horizontal vinyl siding is primarily caused by improper fastening. When vinyl siding is not fastened correctly, it can create tension and restrict the natural expansion and contraction that occurs with temperature changes. Vinyl siding is designed to move slightly as it heats and cools, and if it is secured too tightly or inappropriately, it will not have the freedom to expand, leading to buckling.

Fastening methods must allow the siding to float slightly within the nail slots to accommodate thermal movement. If the nails are overdriven or if the siding is installed too snugly at the top or sides, it can result in deformation, particularly during times of heat. This understanding of thermal expansion and proper fastening techniques is crucial for preventing issues such as buckling.

While harsh weather conditions, poor installation materials, and excessive weight can contribute to various siding issues, the specific cause of buckling directly relates to how the siding is installed and secured to the structure.