The open-valley valley lining standards apply to which of the following?

The open-valley valley lining standards apply to which of the following?

• A. ASTM D 3909 or ASTM D 6380
• B. ASTM D 6380 only
• C. ASTM D 3909 only
• D. No standard

Answer: (A)

Open-valley valley lining standards come from established ASTM guides that define how valley linings should perform and be installed. Both ASTM D 3909 and ASTM D 6380 cover open-valley linings, so the standards for this area can be drawn from either document depending on the context. That makes the option listing both standards the best choice, since it acknowledges the applicability of either standard. Relying on a single standard would omit coverage provided by the other, and there is indeed a standard framework for these valley linings, not none.

Open-valley valley lining standards come from established ASTM guides that define how valley linings should perform and be installed. Both ASTM D 3909 and ASTM D 6380 cover open-valley linings, so the standards for this area can be drawn from either document depending on the context. That makes the option listing both standards the best choice, since it acknowledges the applicability of either standard. Relying on a single standard would omit coverage provided by the other, and there is indeed a standard framework for these valley linings, not none.