The lath in stucco, applied on a stud wall, must be backed by a water resistant layer-typically two layers of No. 15 roofing felt or one layer of No. 30 roofing felt. The assembly also requires an air- weather barrier (AWB). Explain why the roofing felt cannot function as an AWB in addition to providing water resistance. Which material is used as an AWB with stucco?
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