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ATS Termination | Canada

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.

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.

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Top Plate Detail Example
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Bridge Block Detail Example

Cripple Wall Studs Below Bridge Block for D.Fir-L

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Cripple Wall Studs Below Bridge Block

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  1. Capacities shown are based on perpendicular to grain values bearing below the bridge block.
  2. Fastening is limited to worse case capacity shown.
  3. Capacity has been increased by 15% for short term loading. No further increase is allowed.
  4. Assume boundary nailing does not contribute to the system capacity.
  5. Adjust fastening for other loading conditions and fastener types.
  6. Minimum spacing, end and edge distances shall be in accordance with 12.9.2.1 (nails) and 12.11.2.2 (Screws assuming screw diameter = 0.25") of CSA O86-14.
  1. Bridge block by designers. Bridge block member size and species may further limit this capacity.
  2. Cripple studs shall be nailed to full-height studs per evaluation drawings and details above. If (2) cripples are required on each side of rod, nail cripple adjacent to full-height stud with scheduled nails and nail inner cripple with 1/2 of the scheduled nails. If (3) cripples are required on each side of the rod, nail cripple adjacent to full-height stud with scheduled nails and the middle cripple with 2/3 of the scheduled nails and the innermost cripple with 1/3 of the scheduled nails.
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Strap Detail
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  1. Factored resistances shown are the lesser of the steel tensile strength (Tr ) or the lateral nail values (Nr ) for two straps.
  2. Use half of the required nails in each member being connected to achieve the listed capacities.
  3. See current Wood Construction Connectors – Canadian Limit States Design catalogue for other strap configurations.
  4. Values shown are for short-term load durations (KD = 1.15) only.
  5. A maximum clear span of 18" is permitted for MSTC40 and MSTC52. 6. Nails: 8d = 0.131" dia. x 2 1/2" long. 10d = 0.148" dia. x 3" long.
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Top Plate Detail
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Bridge Block Detail
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Strap Detail