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CMST Coiled Medium Strap Tie

CMST

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Coiled Straps

This product's information may differ depending on the category of use. You are currently viewing details related to Coiled Straps. You can also view product information related to the category: Lateral Connectors, Ties and Straps for Cold-Formed Steel Construction

The CMST is a continuous utility strap designed to resist tension and uplift loads. This coiled strap can be cut to length on the jobsite and used in a double 2x stud or post application. The CMST is ideal for many applications including resisting uplift in a floor-to-floor application and also resisting tension in a horizontal application.

Key Features

  • CMSTC option available, which comes with countersunk nail slots for lower profile when installed with 0.148" x 3 1/4" sinkers
  • Used for roof uplift and shearwall overturning resistance
  • A cost-effective alternative to pre-cut straps

Material

  • See table

Finish

  • Galvanized (G90)

Installation

  • Use all specified fasteners; see General Notes.
  • Wood shrinkage after strap installation across horizontal wood members may cause strap to buckle outward.
  • Refer to the applicable code for minimum nail penetration and minimum wood edge and end distances.
  • The table shows the maximum allowable loads and the nails required to attain them. Fewer nails may be used; reduce the allowable load as shown in the General Notes for Straps and Ties.
  • For lap splice and alternative nailing information, see tables below.
  • The cut length of the strap shall be equal to twice the “End Length” noted in the table plus the clear span dimension.
  • Use only every other round hole if the wood tends to split.

Lap Splicing

Lap splicing of coiled straps can be used to extend standard CMST12, CMST14 and CMSTC16 strap lengths longer than 40', 52 1/2' and 54' respectively, for designing continuous drag elements and diaphragm chord members. The Strap Lap Splices table below provides the minimum splice length (Lsp) and fasteners, within the splice length, to achieve the highest allowable capacity of the strap.

The allowable loads table provides allowable loads for coiled straps when installed with different nailing schedules. The highest allowable load given for each model is limited by the steel capacity.

The Engineer/Designer of Record must evaluate and determine the adequacy of the coiled strap’s lap splice and the alternative nailing applications to meet their design loads.

Related Literature

Load Tables

    These products are available with additional corrosion protection. Additional products on this page may also be available with this option. Contact Simpson Strong-Tie for details.

    Many of these products are approved for installation with Strong-Drive® SD Connector screws.

CMST Coiled Straps Load Table
  1. See General Notes for Straps and Ties.
  2. Calculate the connector value for a reduced number of nails as follows:

    Example: CMSTC16 in DF/SP with 40 nails total.
    (Half of the nails in each member being connected)
  3. See table below for alternate nailing and lap splice information.
  4. Fasteners: Nail dimensions in the table are listed diameter by length. For additional information, see Fastener Types and Sizes Specified for Simpson Strong-Tie Connectors.

Strap Lap Splices

CMST Coiled Straps — Strap Lap Splices
  1. See General Notes for Straps and Ties.
  2. 0.148" x 2 1/2" nails can be replaced by 0.148" x 3 1/4" nails. No other nail substitution is allowed for lap splices.
  3. Refer to the applicable code for minimum edge distance and minimum end distance.
  4. No strap modification is allowed and the splice must meet both the minimum number of fasteners and the minimum splice length.

Allowable Loads for Alternative Nailing

CMSTCoiled Straps — Allowable Loads for Alternative Nailing
  1. See General Notes for Straps and Ties.
  2. Fasteners: Nail dimensions in the table are listed diameter x length. For additional information, see Fastener Types and Sizes Specified for Simpson Strong-Tie Connectors.

Code Reports & Compliance

Drawings

PDF DWG DXF RFA IFC SAT