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KWS™ ThermaZee® Cladding Attachment

Something familiar…reinvented. Simple, thermally isolated Z-furring: exceeds code

KWS™ ThermaZee® gives installers and designers the simplicity of what they know: Z-furring; with what they need: code compliant thermal performance. With reduced thermal bridging that rivals modern thermally isolated clip and rail systems, the thermally improved ThermaZee dramatically increases the rainscreen wall assembly’s performance.

Being primarily comprised of steel, ThermaZee offers a resilient, durable and non-combustible option to meet today’s high demand.

ThermaZee employs a specially designed, hollow, thermal isolation strip complimenting other performance enhancements at the web of the girt. The webs unique punch pattern has a substantial reduction in metal penetrating the insulation – about 75% – which decreases heat-flow through the girt. Additionally, the girt’s notched bends and flared punches add extra strength.

Like traditional Z-furring, ThermaZee can be installed either vertically or horizontally, attached to a variety of substrates such as steel studs, wood studs, CMU and concrete. Also, like traditional furring, a variety of claddings can be attached directly or with secondary rails. These include fiber cement, metal panels, HPL panels or aluminum composite material (ACM), among others.

ThermaZee can be specified and purchased as a standalone girt, with or without thermally isolated wall anchors by KWS™. Additionally, KWS™ can provide project-specific engineering if requested.

Advantages to the KWS ThermaZee®

  • Typical installation – installs just like traditional Z-furring
  • Highly perforated for increased drainage
  • Primary load supporting element is non-combustible – similar to a shimmed rail or girt – but with superior thermal and structural properties.
  • Wall anchors can be supplied by KWS or others*
  • ThermaZee can be spaced up to 48” O.C. when used horizontally, or up to a 32” O.C. (every other stud) when used vertically*
  • No trimming of mineral wool insulation required for a snug fit
  • Pre-punched wall anchor holes for easy installation – especially over wood and CMU/concrete substrates
  • Highly corrosive-resistant Zn-Al-Mg ZM40 (ASTM A1046) coated steel for long service life vs. typical G90 galvanized steel
  • Black PVDF finish and stainless-steel options are available
  • Delivered with preassembled thermal isolation strip – ready to install
  • Easily installed over many substrates – steel studs, wood studs, CMU, concrete
  • Engineering calculations can be provided per project for design load compliance (optional)
  • Can be supplied as a full attachment solution – thermally isolated furring, fasteners, secondary rails and engineering (optional)
  • Limited extended labor and material warranty available (optional)


  • AVAILABLE DEPTHS: 1 ½ in · 2 in · 2 ½ in · 3 in · 3 ½ in · 4 in · 4 ½ in · 5 in
  • AVAILABLE LENGTHS: 120 in Standard (96 in Available)

*Spacing of components varies by project based on project specific conditions. Maximum allowable spacing and dead load (weight of cladding) is based on the total load (dead + live) acting on the assembly and connections. Depending on the system, insulation thickness will influence the systems capacities.

Wall anchors must be specified and supplied by KWS for an extended written limited warranty. KWS will specify the exact anchor type, embedment depth and spacing for anchors in project specific engineering packages. ThermaStop thermal isolation washers must be used on all types of wall anchors with the HCI or CI System, regardless of the substrate.

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, MFI, ThermaZee, ThermaBracket, TermGirt and PanelRail are registered trademarks controlled by Knight Wall Systems, Inc. ThermaStop is a trademark of Knight Wall Systems, Inc. Patents US 11,299,891; 11,286,676; 9,856,655; 9,732,518; 9,677,268; 8,429,866 and others pending. This list is not exhaustive and Knight Wall Systems does not waive its rights in regard to other patents or trademarks that are not listed.