According to ASTM E1966, what type of test is required for horizontal and vertical joints?

The requirement for a hose stream test for horizontal and vertical joints ensures the components can withstand the impact of water from a fire hose, which simulates the conditions that may be present during actual firefighting efforts. This test assesses the integrity of the joint after exposure to high temperatures and the subsequent cooling, which is critical in confirming that the components maintain their functionality and continue to perform their intended fire protection role.

Under ASTM E1966, the hose stream test evaluates how well joints can endure the stresses caused by both fire and the application of water, which can cause thermal shock. This is particularly significant since the integrity of joints is vital for maintaining fire resistance ratings and preventing fire spread between compartments. By passing this test, the joints demonstrate that they can maintain their structural integrity when subjected to the conditions expected during a fire emergency.