Attachment System

Definition

An attachment system refers to vertically mounted members attached directly to the exterior wall sheathing or insulation. These members serve as the connection points for the rainscreen veneer and can include batten strips, metal furring, hat channels, or similar strapping. The system creates an air gap between the veneer and the weather barrier, enhancing ventilation and drainage.

Purpose

The purpose of an attachment system is to:

• Secure the rainscreen veneer to the building structure while maintaining an essential air gap for ventilation.
• Protect the underlying wall sheathing and insulation by facilitating drainage and reducing moisture buildup.
• Improve the durability and longevity of the exterior wall by preventing water infiltration and allowing the wall assembly to breathe.
• Provide a stable and reliable framework for installing various types of exterior cladding materials.

Examples of Use

1. Residential Buildings:
   • In homes, an attachment system might be used to install wood, fiber cement, or composite siding, creating a rainscreen that protects against moisture and improves energy efficiency.
   • Retrofits of older homes may include attachment systems to add new cladding without compromising the existing structure.
2. Commercial Buildings:
   • Office buildings and retail spaces often use attachment systems to install metal panels or other durable veneers, ensuring the facade remains protected and aesthetically pleasing.
   • Large-scale commercial projects may incorporate advanced attachment systems to manage the weight and alignment of heavy cladding materials.
3. Institutional Buildings:
   • Schools, hospitals, and government buildings use attachment systems to install exterior cladding that meets stringent durability and safety standards.
   • These systems support materials like brick, stone veneer, or high-pressure laminates, providing long-lasting protection and a professional appearance.

Related Terms

1. Rainscreen: An exterior cladding system designed to shed rain and control moisture, typically installed over an attachment system.
2. Weather Barrier: A layer that prevents water infiltration and air leakage, often positioned behind the attachment system.
3. Sheathing: The layer of boards or panels that forms the base of a wall, roof, or floor, to which the attachment system is mounted.
4. Ventilated Facade: A wall assembly that includes an air gap to facilitate ventilation and moisture control, often involving an attachment system.
5. Cladding: The exterior material applied to a building's structure, supported by the attachment system, which provides aesthetic and protective functions.

Notes

• The choice of materials for the attachment system, such as wood battens or metal furring, depends on factors like the weight of the veneer, local climate conditions, and the building’s design specifications.
• Proper installation of the attachment system is crucial to ensure effective moisture management and structural integrity of the rainscreen assembly.
• The air gap created by the attachment system not only aids in moisture control but also enhances the thermal performance of the building envelope by allowing air circulation.
• Regular inspection and maintenance of the attachment system are necessary to ensure its long-term performance and to address any potential issues caused by environmental exposure or mechanical stress.