ACS’s Clips with PROLOFT™ have a very low conductivity that reduces thermal bridging considerably, as well as meeting the Building Codes with ASHRAE 90.1 2010 requirements. Our “A-Clip, combined with PROLOFT™ in Wall Systems 1 and 2, greatly reduces the effects of thermal bridging. Therefore, the insulation value can be fully realized for higher thermal performance.
The A-Clip is an adjustable component of an exterior thermal break/rain-screen cladding system. It consists of a two-piece stainless steel clip attached to the exterior of the structure with two fasteners, and has PROLOFT™ insulation adhered to the inner and outer flanges. The A-Clip adjustability allows the installer to create an accurate plane for attaching cladding, compensating for the reality that most current cladding support systems have little allowance for uneven structural support. With most other cladding support systems, the lack of adjustability either requires extremely accurate structural framing that typically isn’t delivered in practice, or requires labour-intensive shimming by the installer. A major advantage of the A-Clip in addition to its adjustability and meeting the ASHRAE 90.1 U-Factor Requirement is meeting the Continuous Insulation Requirement of ASHRAE 90.1. This is achieved using PROLOFT™ high performance insulation on both flanges. Since PROLOFT™ insulation is a semi-rigid material, the stress in the PROLOFT™ between the inner clip flange and the structure should be designed to limit the amount of self-weight deflection in the cladding assembly. The initial ACS design had limited the compressive strain to an allowable value of 15 psi in the Proloft™, but subsequent testing by Intertek Testing Services Ltd. found that the clips could resist higher loads and result in less deflection with the PROLOFT™ compressed about 1/8” per 3/8” thickness. This small preload allows the space between clips to be increased, reducing the overall number of A-Clips required for a given cladding area. Intertek has also confirmed that the small amount of compression is not detrimental to the insulation RSI value, due to the thermal characteristics of the PROLOFT™. After attaching the inner component to the building, the A-Clips are adjusted by sliding the outer component in/out, and then terminating the A-Clip by installing at least two stainless steel #10 self-drilling/self-tapping screws through the web of the inner and outer sections. The outer A-Clip flange can support vertical or horizontal continuous sub-girts, depending on requirements of the cladding installation.