Where is the WRB (water resistive barrier) in Halo Exterra?
For creating a WRB when using Halo Exterra, you have two options:
Seal the joints and penetrations of the installed Halo Exterra panels. Then the front face of the Exterra panels combined with the sealed joints can function as the WRB.
Alternatively, a separate membrane classified as a WRB can be used in the wall assembly to function as the weather resistive barrier.