Question 26

The joints between cementitious wood-fiber deck panels are required to be filled when the space between the panels exceeds 1/4 inch.

When the space between cementitious wood-fiber deck panels exceeds 1/4 inch, it is mandatory to fill the joints to ensure structural integrity and prevent moisture infiltration.

A) 1/16 inch.

This option is incorrect because filling joints at this gap is not required. A 1/16 inch space is generally considered too small to necessitate filling, as it does not significantly impact the structural performance or moisture control of the deck.

B) 1/8 inch.

Option B is also incorrect. While a gap of 1/8 inch may be noticeable, it is still within an acceptable range where filling the joints is not required according to standard practices for cementitious wood-fiber deck panels.

C) 1/4 inch.

This option is correct because it specifically identifies the threshold at which the joints must be filled. Gaps exceeding 1/4 inch can lead to potential issues such as water penetration and instability, thus making filling essential for maintaining the integrity of the deck.

D) 3/8 inch.

Option D is incorrect as it suggests a larger gap than what is required for filling. Filling joints at this size may be too late for effective moisture management and structural support, as the critical threshold is established at 1/4 inch.

Conclusion

The requirement to fill joints between cementitious wood-fiber deck panels when the gap exceeds 1/4 inch is crucial for ensuring the durability and performance of the deck. Options A and B do not meet the necessary criteria, while D exceeds the required threshold, making C the only correct choice that aligns with industry standards.