There should be no holes punched in the vapor retarder.

There should be no holes punched in the vapor retarder.

• A. True
• B. False
• C. Not Specified
• D. Only With Margin

Answer: (A)

A vapor retarder is meant to be a continuous barrier under the slab to prevent moisture from migrating from the ground into the concrete and floor finishes. Punching holes in it creates pathways for vapor, compromising its function and allowing moisture to move upward, which can cause curing issues, staining, efflorescence, and poor adhesion of toppings. Therefore, there should be no holes punched in the vapor retarder. If there are penetrations for conduits or pipes, they must be detail-sealed around the openings with approved materials to maintain the barrier’s integrity, rather than creating holes.

A vapor retarder is meant to be a continuous barrier under the slab to prevent moisture from migrating from the ground into the concrete and floor finishes. Punching holes in it creates pathways for vapor, compromising its function and allowing moisture to move upward, which can cause curing issues, staining, efflorescence, and poor adhesion of toppings. Therefore, there should be no holes punched in the vapor retarder. If there are penetrations for conduits or pipes, they must be detail-sealed around the openings with approved materials to maintain the barrier’s integrity, rather than creating holes.