SigmaStud® Web Reinforcement

SigmaStud Web RFT provides reinforcement of holes added to the stud web during construction, when holes larger than the standard knockout are introduced into the web of the member. It ensures that the load capacity of the stud is not compromised when these types of oversized holes are present.

Any larger holes cut into SigmaStud® require a review by the engineer, as load capacity is based on the existence of standard punchout sizes.

  • No loss of stud strength when using the SigmaStud Web RFT with up to a 3″ hole.
  • Each SigmaStud Web RFT contains 12 pre-drilled guide holes in the center section and 12 in the outside flanges, 6 per side, to ensure proper placement of the (24) #12 self-drilling self-tapping screws required.
  • Contact TSN’s Project Management Team at (888) 474-4876 for more recommendations.

SigmaStud® Web RFT is available in 54 or 97 mil thicknesses, and is designed for use with 550 & greater sized SigmaStud.

Designate: SG Web RFT-54 or SG Web RFT-97

* Use SG Web RFT-54 for SigmaStud 54mil and lower. Use SG Web RFT-97 for SigmaStud 68mil and higher.
** Contact TSN Engineering for specific recommendations.
*** Each SigmaStud Web RFT contains 12 pre-drilled guide holes in the center section, 12 additional screws are required in the outside flanges, 6 per side.
**** Non standard holes may not exceed half of stud depth. All modifications to SigmaStud must be reviewed by a structural engineer.

Material Composition
ASTM A1003/A1003M or ASTM A653/A653M, G-60 (Z180) minimum hot-dipped galvanized coating; or equivalent. Grade 50 (340), 50ksi (340 MPa) minimum yield strength, 65ksi (450 MPa) minimum tensile strength.

TSN’s Product Catalogs are an essential resource for the design of cold formed steel. Developed by Engineers, the catalogs contain design data for members, connectors, and fasteners. SigmaStud® Web RFT can be found in the following Catalogs:

TSN Cold-Formed Steel Framing Loadbearing Order Catalog

TSN Loadbearing Technical Catalog

TSN Cold-Formed Steel Framing Loadbearing Technical Catalog

TSN Loadbearing Order Catalog

For a full list of our product catalogs, specification sections, inspection checklists, and research reports please click here.

SigmaStud® Web Reinforcement Downloads

SigmaStud® Web Reinforcement Application

SigmaStud Web RFT Application

Hole Reinforcement in a SigmaStud

SigmaStud Web RFT - Application Top View

Hole Reinforcement in a SigmaStud - Top View

Installation Instructions

  1. Cut SigmaStud® web punch out to specified size
  2. Align SigmaStud Web RFT with SigmaStud punch-out
  3. Install (24) #12 self-drilling screws through guide holes.
  4. When access to guide holes is limited, install screws BETWEEN guide holes from the opposite side.

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