Which ASTM standard requires a hose stream test on horizontal and vertical joints?

The correct answer is ASTM E1966, which outlines the testing procedures for firestop systems, specifically requiring a hose stream test to evaluate the performance of firestop joints in both horizontal and vertical applications. This standard is critical as it simulates the conditions that a firestop system may face during an actual fire situation. The hose stream test assesses the durability and the ability of the firestop material to withstand the mechanical impacts caused by a water stream, thereby ensuring that the fire barrier continues to function effectively even under such stress.

The inclusion of horizontal and vertical joints in the testing criteria is essential because these joints are common points in construction where structural elements meet, and their integrity is vital in preventing the spread of fire and smoke. ASTM E119-UL 263 primarily focuses on the fire resistance of building assemblies, while ASTM E84 is concerned with surface burning characteristics of building materials. ASTM D7080, on the other hand, deals with fire tests for the evaluation of firestop and through-penetration firestop systems, but does not specifically mandate the hose stream test across orientations. Thus, ASTM E1966 stands out as the standard that directly addresses the requirement in question.