Backing for welded-wire fabric lath must meet which requirements?

Backing for welded-wire fabric lath must meet which requirements?

• A. Comply with federal specifications for building paper No. UU-B-790
• B. Be made of other waterproofing or insulating material exceeding federal specifications
• C. Be securely attached
• D. All of the above

Answer: (D)

Backing for welded-wire fabric lath must provide a reliable, stable base that controls moisture and supports plaster adhesion. This means the backing material should meet the federal specification for building paper UU-B-790, or be some other waterproofing or insulating material that exceeds those specifications to ensure adequate performance. In addition, the backing must be securely attached to the substructure to prevent movement or detachment during plaster application and over time. When these conditions are all satisfied, the system will resist moisture-related issues and maintain a sound bond, so the correct choice is all of the above.

Backing for welded-wire fabric lath must provide a reliable, stable base that controls moisture and supports plaster adhesion. This means the backing material should meet the federal specification for building paper UU-B-790, or be some other waterproofing or insulating material that exceeds those specifications to ensure adequate performance. In addition, the backing must be securely attached to the substructure to prevent movement or detachment during plaster application and over time. When these conditions are all satisfied, the system will resist moisture-related issues and maintain a sound bond, so the correct choice is all of the above.