Materials:(Universal) Knudson KR-12

Jump to: navigation, search

Materials:(Universal) Knudson KR-12

Division C - Accepted Materials

Knudson KR-12
by Universal Sheet Metal Ltd.

The metal panel listed and described below is accepted for use in the RoofStar Guarantee Program.
Universal Sheet Metal Ltd.
Contact Address
See the current Membership list and contact information at
Product Group - Standing Seam Metal Roof System
Panel Machine
Knudson KR-12
Panel Name
Universal) Knudson KR-12 Standing Seam panel
Seam Type
Standing Seam: 38 mm (1-1/2")

The roofing assembly / material information published below and in the RCABC Roofing Practices Manual DOES NOT represent a complete set of the manufacturer's published data, nor does it represent a detailed specification. The preparation of a detailed specification is the responsibility of the design authority. For more information about this product or system, consult the manufacturer.


The Knudson KR-12 is an on-site continuous panel metal roofing machine. Panel profiles vary from 300 mm (12") to 500 mm (20") wide with a seam height of 38 mm (1 1/2").

On-site roll forming provides for the elimination of end laps with continuous panel forming capabilities in lengths up to nominal 46 m (150').


  1. General: Standing seam panels employ a hidden fastening system for securement to a solid substrate. Panels are seamed together with a mechanical seamer.
  2. Range of application: on wood or metal sloped roofs; in commercial, institutional, industrial and residential construction; for re-roofing or new construction.
  3. Fasteners (Screws):
    1. For panel clip to steel attachment to be No. 12-16 by 22 mm (1") long self- drilling, self-tapping, hex-washer head plated steel screws used without sealing washers. Two fasteners per panel clip used, inserted into panel clip guide holes.
  4. Clips:
    1. Two part assembly consisting of a No. 16 MSG min thick coated steel base approximately 47.6 mm (1-7/8") wide and 40.9 mm (1-5/8") long and a No. 22 MSG min thick coated steel upper tab section. Fastened 600 mm (24") on centre. Height 61 mm (2-7/16") min, 75 mm (3") max, width 108 mm (4-5/16"); Knudson Manufacturing Inc. KR-24 Low-Floating Clip, KR-24 High-Floating Clip, or
    2. One part assembly, No. 22 MSG min coated steel. Height, 59 mm (2-3/8") min, 75 mm (3") max, width 75 mm (3"); Knudson Manufacturing Inc. KR-24 Low-Fixed Clip, KR-24 High-Fixed Clip, fastened 600 mm (24") on centre.
  5. Deck Requirements: in keeping with the Standard for Architectural Sheet Metal (ASM) Systems






  1. Minimum roof slope is 1:6 (2" in 12"). Severe conditions (heavy snow or ice) minimum slope is 1:1.5 (8" in 12").


  1. Wind Uplift Resistance: Panel securement shall conform to the requirements in Part 3 of the Standard for Architectural Sheet Metal (ASM) Systems.
  2. Materials:RoofStar (RGC) accepted metal panel systems shall be formed of steel conforming to the requirements published in Section 9.2. of the Standard.

Back to Site-Formed Metal Roofing Systems

Back to Accepted Materials