Where sheathing protects piping that penetrates concrete or masonry walls or floors, the sheathing must be installed in a manner that allows _____.

The correct answer emphasizes the importance of allowing movement of the piping within the sheathing. This is essential because pipes may expand and contract due to changes in temperature, pressure, and the fluid passing through them. If the sheathing were to be rigidly fixed, it could restrict this movement, potentially leading to stress on the pipe joints, leaks, or even breaking. Therefore, proper installation of sheathing that permits this movement is crucial for maintaining the integrity and durability of the plumbing system.

Other options, while they may sound plausible, do not address the fundamental concern of thermal expansion and contraction. For instance, secure attachment and accessibility for maintenance are important but secondary to ensuring that the piping can move freely as required. Insulation from heat may be necessary in certain contexts, but it does not take precedence over the need for accommodating movement in this case. Ultimately, the correct installation of sheathing must prioritize the allowance for movement to ensure the longevity and reliability of the plumbing.