The design of the cladding attachment system

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Some examples of thermally-efficient cladding attachments currently available in the industry include clip and rail, aluminum t-clips, and long screws (Figure 1). Each of these can have its own unique attachment method, with varying potential effects on air and water tightness and the overall thermal performance to be considered, understood, and addressed by design and construction professionals.

can be developed by an engineer working for the architect, contractor, or cladding manufacturer. As a part of these efforts, the spacing of the supports is analyzed to make the best use of the exterior insulation and thermal rcs data performance, as well as to meet the needed structural requirements. This information can then be incorporated into the overall enclosure design. However, the impact these cladding attachments may have on the effectiveness of the AWB regarding air and water control can easily be overlooked (Figure 2).

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Figure 1: Close-up of z-girts and pins at air and water barriers (AWB).
Product evaluation
Presently, ASTM D1970, Standard Specification for Self-Adhering Polymer Modified Bituminous Sheet Materials Used as Steep Roofing Underlayment for Ice Dam Protection, is frequently referenced in specifications and manufacturers’ literature to demonstrate a membrane’s “self-sealability” characteristics.