Apply Secondary Moisture Barrier (Black Underlayment)

What happens here

After installing the primary weather barrier, apply a secondary moisture barrier over it. This typically consists of asphalt-saturated felt paper (often called tar paper) or a specialized non-permeable membrane. This additional layer provides enhanced protection against moisture penetration, which is crucial for stone veneer installations. Ensure all seams are properly lapped in a shingle-style fashion, starting from the bottom and working your way up, securing with staples.

Goal: Provide additional moisture protection for the wall.