When installing poly underlayment beneath a slab, the seams should be overlapped by how many inches?

When installing poly underlayment beneath a slab, the seams should be overlapped by how many inches?

• A. 2 inches
• B. 4 inches
• C. 6 inches
• D. 8 inches

Answer: (C)

When installing poly underlayment beneath a slab, it is important that the seams are overlapped by 6 inches. This amount of overlap helps to ensure a proper moisture barrier, preventing moisture from the ground from penetrating through the seams and affecting the integrity of the slab and any flooring materials placed on top. Overlapping the seams sufficiently reduces the chances of gaps or breaks in the moisture barrier, which could lead to issues like mold growth, warping, or other damage due to moisture exposure. By adhering to the recommended overlap, you enhance the effectiveness of the underlayment and contribute to the longevity and durability of the flooring system.

When installing poly underlayment beneath a slab, it is important that the seams are overlapped by 6 inches. This amount of overlap helps to ensure a proper moisture barrier, preventing moisture from the ground from penetrating through the seams and affecting the integrity of the slab and any flooring materials placed on top. Overlapping the seams sufficiently reduces the chances of gaps or breaks in the moisture barrier, which could lead to issues like mold growth, warping, or other damage due to moisture exposure. By adhering to the recommended overlap, you enhance the effectiveness of the underlayment and contribute to the longevity and durability of the flooring system.