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Multi-Ply Wood Trusses Applications: Strong-DriveĀ® Screws (SDS) For Two-Ply 4X2 Parallel Chord Trusses

Thank you for choosing Simpson Strong-Tie for your uplift connectors!

Steps to Choose an Uplift Connector

  1. Determine roof uplift capacity required.
  2. Determine species of wood being connected.
  3. Enter table below and choose connector.
  4. Determine if lateral loads are required in addition to uplift loads. If so, lateral loads are listed here. See below for reducing capacity for loading in multiple directions.
  5. Install connectors using number and size of fasteners shown in this table.
  6. For more options for selection of connectors, see here.
  7. Install additional connectors to provide a continuous load path to the foundation. See here for more information on the continuous load path.
Selecting Connectors For Roof-to-Wall Connection
Lumber Species Uplift Required Connector
Both members Southern Pine or Douglas Fir-Larch lumber 480 or less H2.5A
481 - 745 H8
746 - 1000 MTS12
1001 -1340 H10A
1341 -1450 HTS20
One or both members Spruce-Pine-Fir or Hem-Fir Lumber 480 or less H2.5A
481 - 565 H8
566 - 860 MTS12
861 - 1015 H10A
1016 - 1245 HTS20

For other multi-ply applications, see SDS for Girder Trusses and SDW Strong-Drive Structural Wood Screws.


Installation Method 1
Installation Method 1
- Top Chord Other web configurations may be used -
Installation Method 2
Installation Method 2
- Vertical Web Other web configurations may be used -
Screw position in the truss
Screw position in the truss

Load Table

Load Table
  1. Allowable loads are based on a CD = 1.00. Increases are allowed for other durations per code to a maximum CD = 1.60.
  2. Method 1 - To be considered effective all Strong-Drive screws shall be installed within 12" of the applied concentrated load.
  3. Method 1 and Method 2 screws can be combined as required to transfer half of the applied load to the supporting truss.
  4. For uniform top chord loads, space Strong-Drive screws as required to transfer half of the applied load to the supporting truss.
  5. Web configurations other than those shown above may be used as allowed by the Truss Designer.