How many joists should each segment of deck planking bear on at a minimum?

Each segment of deck planking should bear on a minimum of three joists. This guideline ensures that the load is evenly distributed across the supporting structure, providing adequate strength and stability to the deck. When three joists support each plank, it helps to minimize the risk of bending or sagging, which can occur if the planks are inadequately supported.

Furthermore, having at least three joists allows for better alignment and strength during structural loads, whether from activities on the deck or environmental factors like wind or snow. Improperly supported planking can lead to safety hazards and premature wear, making adherence to this minimum support requirement essential for lasting deck integrity.

Supporting segments of deck planking on two joists would not provide sufficient security, while four or five joists would offer excessive support, unnecessarily complicating the construction and adding material costs without tangible benefits.