Top-Storey Termination Types
Three top-storey run termination options are provided to tailor the solution to the project’s specific needs. The option chosen will depend on construction preference or structure conditions, such as sloped top plates, truss/rafter locations that may conflict with top-plate termination and available space above top plates for the take-up device assembly.
General Instructions for the Installer
These general instructions for the installer are provided to ensure proper selection and installation of Simpson Strong‑Tie Company Inc. products and must be followed carefully. These general instructions are in addition to the specific installation instructions and notes provided for each particular product, all of which should be consulted prior to and during installation of Simpson Strong‑Tie Company Inc. products.
The traditional termination is the top-plate termination. However, run stops below the top plate using the bridge block or strap detail are often necessary or preferred. The bridge block detail accommodates high loads with installation from the inside of the structure. Where loads are lower and straps are preferred, the strap detail can be used. With the design support services we offer, Simpson Strong-Tie will also verify each specified run application and recommend the best termination method for the given project. Consider these variables when specifying run terminations.
Bridge Block Detail Example
Top Plate Detail Example
Cripple Wall Studs Below Bridge Block
- Capacities shown are based on perpendicular-to-grain values bearing below the bridge block.
- Fastening is limited to worse-case capacity shown.
- Capacity has been increased by 15% for short-term loading. No further increase is allowed.
- Assume boundary nailing does not contribute to the system capacity.
- Adjust fastening for other loading conditions and fastener types.
- Minimum spacing, end and edge distances shall be in accordance with 188.8.131.52 (nails) and 184.108.40.206 (screws assuming screw diameter = 0.30") of CSA O86-14.
- Bridge block by Designer. Bridge block member size and species may further limit this capacity.
- SCL refers to Structural Composite Lumber onto SPF studs. The SCL is assumed as Parallam® PSL, LSL, or LVL with ΦFcp of 1,092 psi or 7.53 MPa, and Specific Gravity of 0.50.
- Nails: 16d = 0.162" dia. x 3 1/2" long.
- Factored resistances shown are the lesser of the steel tensile strength (Tr) or the lateral nail values (Nr) for two straps.
- Use half of the required nails in each member being connected to achieve the listed capacities.
- See current Wood Construction Connectors – Canadian Limit States Design catalogue for other strap configurations.
- Values shown are for short-term load durations (KD = 1.15) only.
- A maximum clear span of 18" is permitted for MSTC40 and MSTC52.
- Nails: 8d = 0.131" dia. x 2 1/2" long. 10d = 0.148" dia. x 3" long.
Top Plate Detail
Bridge Block Detail