Rainscreen Attachment Exceeds ASHRAE 90.1 Prescriptive Requirements

Knight Wall Systems has announced the introduction of MFI-System, a second-generation, versatile rainscreen attachment system for use with mineral-fiber insulation that dramatically reduces thermal bridging and easily exceeds ASHRAE 90.1 prescriptive requirements.

ASHRAE’s prescriptive requirement for steel-frame walls is an effective R-value of 15.6 ft2 (U-Factor 0.064) – ºF – hr/btu (in Climate Zones 4-8). Knight’s MFI-System delivers an effective R-15.8 ft2 – ºF – hr/btu with 3.5 inches of exterior mineral fiber and R-17.3 ft2 – ºF – hr/btu with 4 inches.

MFI-System features a corrosive-resistant 55 AL-ZN AZ50 coating for a long service life. Knight’s S-Rail (static) or D-Rail (dynamic) may be attached to its thermally isolating ThermaBracket in a vertical or horizontal orientation for increased façade versatility. Exterior insulation fits tightly around brackets without trimming and the ThermaStop thermal isolation assembly is pre-assembled to the bracket. Nearly any cladding can be attached with easy and efficient installation and detailing. MFI-System also provides excellent ventilation with a minimum constant 3/4-inch continuous rainscreen cavity. Out-of-plumb existing walls can easily be straightened with an integrated adjustment feature or by the use of fitted shims designed to keep the ThermaBracket structurally sound over its service life.

Knight Wall Systems is a subsidiary of Knight Construction and Supply Inc., in business since 1968, serving commercial, industrial and institutional customers throughout the US. The firm has more than 100 employees at its eastern Washington headquarters and manufacturing facility.

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