Knight MFI® System Rainscreen Attachment - Knight Wall Systems

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Knight MFI® System Rainscreen Attachment



  • Wall assembly:
    • 4″ mineral fiber insulation exterior: R-4.2/in,
    • A/W barrier
    • exterior gypsum board
    • empty steel stud cavity (16” O.C.)
    • interior gypsum board:
      • Add a fiberglass clip with 4 inches of mineral fiber insulation:
        Effective R-value = 16.8 (U-value = 0.0595 – 16% R-Value degradation)
      • Add KNIGHT’S MFI® System with 4 inches of mineral fiber insulation (brackets at 24″ O.C.):
        Effective R-value = 17.2 (U-value = 0.058 – only 14% R-Value degradation)!


  • Brackets can be spaced to 48″ O.C.*
  • Rails may be attached to ThermaBracket™ in a vertical or horizontal orientation
  • Project specific engineering available
  • Limited 10-year warranty available
  • High corrosive-resistant Zn-Al-Mg ZM40 coating for a long service life vs. typical G90 Galvanized steel
  • ThermaStop™ assembly arrives onsite attached to ThermaBracket – No pre-assembly required
  • Exterior insulation fits tight around ThermaBrackets without trimming
  • Attach nearly any cladding with easy and efficient installation and detailing
  • Wall anchors included (typically stainless steel TEK screws)
  • Minimal thermal bridging
  • Accommodates up to 6″ of outboard insulation
  • Faster installation: Built-in adjustability easily plumbs old and new walls equating to labor cost-savings
  • Pre-engineered and tested (substrate connection detailed per project)
  • Ideal for renovations
  • Extremely cost competitive compared to typical means of exterior insulation
Knight Wall Systems’ MFI® System rain screen provides room for up to 6” of insulation on the exterior of the wall. Combined with Knight’s patented ThermaStop thermal isolation system (the only isolation system of it’s kind), it will dramatically increase the effectiveness of the insulation and overall energy efficiency of the building. This is achieved due to the minimal thermal bridging introduced by the metal brackets penetrating the insulation, thereby slowing heat loss (or gain) through the wall assembly, without sacrificing the structural integrity of the attachment system.

The MFI System is available in two iterations: S-Series and D-Series. Both systems offer the same versatility and thermal performance!



  • S-Rail may be attached to ThermaBracket-S in a vertical or horizontal orientation
  • Drained/ventilated cavity created by vented S-Rail and uninterrupted by obstructions: 3/4″
  • Additional layer of rails may be attached to the S-Rail for freedom of layout independent of stud layout or expanded panel compatibility (see typical details and specifications)
  • S: Static – the S-Rail to ThermaBracket connection is fixed with about 1/8″ built-in adjustability
  • Adjustments made on an out-of-plumb or out-of-plane substrates are made by Knight’s supplied isolator shim without sacrificing thermal performance
  • Isolator shim fits square, straight and flat to the back of the ThermaStop system by means of raised lips that securely lock the shim in-place for maximum structural integrity
  • Knight’s isolator shim is included with every S-Series MFI System shipped



  • D-Rail may be attached to ThermaBracket-D in a vertical or horizontal orientation
  • Drained/ventilated cavity created by vented D-Rail and uninterrupted by obstructions: 1.5″
  • Additional layer of rails may be attached to the D-Rail for freedom of layout independent of stud layout or expanded panel compatibility (see typical details and specifications)
  • D: Dynamic – the D-Rail to ThermaBracket-D connection has built in adjustability of 7/8″ for a quick, simple and precise installation


*Spacing is dictated by design wind pressure, cladding weight, deflection requirements and substrate type. Contact KWS for project specific spacing recommendations.

NOTICE: No freedom from any patent owned by Knight Wall Systems or others is to be inferred. Because use conditions and applicable laws may differ from one location to another and may change with time, Customer is responsible for determining whether products and the information in this document are appropriate for Customer’s use. NO EXPRESS WARRANTIES ARE GIVEN EXCEPT FOR ANY APPLICABLE WRITTEN WARRANTIES SPECIFICALLY PROVIDED BY KNIGHT WALL SYSTEMS. ALL IMPLIED WARRANTIES INCLUDING THOSE OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE EXPRESSLY EXCLUDED.

CI, CI-Girt and MFI are registered trademarks controlled by Knight Wall Systems, Inc. CI-System, HCI-System, MFI-System, HCI-Girt, PanelRail, RevealRail, Reveal-Girt, ThermaBracket, ThermaStop, PanelTek & SidingRail are trademarks of Knight Wall Systems, Inc. Patent US 8,429,866 B2 and others pending.

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