A weather-resistant barrier and metal lath are essential behind stone veneer to protect the wall structure and provide a stable base for installation. This layered system prevents moisture from reaching the wall sheathing and framing underneath.
The typical layers behind stone veneer include:
- A water-resistive barrier, like building paper or house wrap, to block moisture
- Metal lath, which provides a surface for the mortar scratch coat to bond to
- A scratch coat of mortar, creating the base layer the stone will be set into
- Proper flashing around windows, doors, and other openings to direct water away from the wall
Skipping or improperly installing any of these layers is one of the most common causes of moisture damage and stone veneer failure down the road. This is especially important in Utah’s climate, where freeze-thaw cycles can worsen hidden moisture problems.
Because these layers are critical to the long-term performance of stone veneer, this installation is best handled by an experienced contractor who follows manufacturer specifications closely.