ACT Mud Walls Practice Questions - ACT Mortar (Mud) Walls Exam

Why is a cleavage membrane installed behind metal lath in TCNA Method W201?

To bond the mortar bed to the structural wall To isolate the mortar bed from substrate movement and protect the backing from moisture To replace the need for a separate vapor barrier To increase the strength of the mortar bed

Correct Answer:

To isolate the mortar bed from substrate movement and protect the backing from moisture

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