Description
CMSTC provides coined nail slots for lower profile when installed with 0.148" x 3 1/4" sinkers; it can be cut to length. CS are continuous utility straps which can be cut to length on the jobsite. Packaged in lightweight (about 40 lb.) cartons.
Key Features
- Gauge stamped on part for easy identification
Finish
- Galvanized. Some products available in ZMAX® coating. See Corrosion Information.
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 obtain them. Fewer nails may be used; reduce the allowable load as shown in the General Notes for Straps and Ties.
- For lap splice and alternate 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.
- CMST only — use every other round hole if the wood tends to split. Use round and triangle holes for comparable MST loads, providing wood does not tend 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 alternative nailing applications to meet their design loads.
Options
- CS straps are available in 25' lengths; order CS14-R, CS16-R or CS20-R
- For stainless steel, order CS16SS-R
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.
For stainless-steel fasteners, see Fastener Types and Sizes Specified for Simpson Strong-Tie Connectors.
Many of these products are approved for installation with Strong-Drive® SD Connector screws.
- See General Notes for Straps and Ties.
- 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)
- See table below for alternate nailing and lap splice information.
- 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
- See General Notes for Straps and Ties.
- 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.
- Refer to the applicable code for minimum edge distance and minimum end distance.
- 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
- See General Notes for Straps and Ties.
- 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.
