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LDSS Light Diaphragm Spline Strap for Mass Timber

Model: LDSS48 installed with QD WSV75SA Collated Screws

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The LDSS light diaphragm spline strap is designed to be placed directly on top of CLT (cross-laminated timber) and other mass timber panels to connect them together. Unlike plywood splines, the LDSS does not require routing. As part of the Simpson Strong-Tie® complete LDSS spline solution, the steel strap installs easily and safely using our PRO300SG2A Quik Drive® tool and collated Strong-Drive® WSV Subfloor screws. The LDSS features an innovative embossed hole design that helps guide the installation tool and increase fastener capacity.

Material

1.5mm Carbon Steel

Finish

Z275 Galvanised

Features & Benefits
  • No routing required; the strap can be placed directly on top of mass timber panels, reducing manufacturing time and cost
  • Less susceptible to moisture damage than plywood splines, reducing need for expensive repairs
  • Embossed hole helps guide the installation tool into the hold and increases capacity per fastener
  • Tested for in-plane shear values
  • Can be used as part of a complete spline solution throughout a project for faster installation and to save on the total cost of spline connections
  • Can be installed in standing position when used with Quik Drive® and optional nose clip
Installation
  1. Place the strap on the surface of the panels with the centerline notches aligned with joint between adjacent panels.
  2. From a standing position, hold tool perpendicular to the face of the strap and place the noseclip over the embossed feature. Drive the screw. Repeat.
  3. Use all specified fasteners.
Applications
  • CLT Floor or Wall Panel Joint
  • Floor-to-Floor Tie Down
  • Diaphragm Tension Strap
 
 
Model No. Table

Model No.

Size (mm)

Material & Finish

Box Qty

LDSS48

95 (W) x 1207 (L) x 1.5 (H)

Carbon Steel 
Z275 Galvanised

10
 
Partner Products

Model No.

Description

Box Qty.

QDPRO300SG2A

PRO300 Attachment. Includes carry case (Excludes Tool)

1

PNOSECLIP-LDSS

Quik Drive Locator Nose Clip for LDSS48 Spline Strap (Suits PRO300 only)

1

WSV75SA

Strong-Drive® WSV 10G x 75mm SUBFLOOR Screw (Collated)

1,000

N10DHDGPT500

Strong-Drive 33° SCN SMOOTH-SHANK CONNECTOR Nail - 64mm x 3.75mm HDG

500

N10DHDGPT2500

2,500

CCN64

CCN64 Collated Connector Nailer - suits 38-64mm 33° SCN and SCNR CONNECTOR Nails

1
 
Technical Data

Model No.

Thickness (mm)

CLT Layup (min.)

Fasteners

Fastener Spacing (mm)

Shear Design Capacity per 1200mm Strap (kN)

LDSS48

1.5

Three-ply

WSV75SA
(10G x 75mm)

100

7.0

50

13.3

N10DHDGPT
(64mm x 3.75mm)

100

19.6

50

35.6
  1. Design capacity is based on the use of cross-laminated timber (CLT) with a density greater than 380kg/m3.
  2. Design capacity is for wind or seismic loading combination with no further increase allowed; reduce apply where other load combination are required.
  3. Design capacity is based on lesser of calculations per AS1720.1 and AS/NZS 4600:2018.
  4. Nails: 3.75mm dia x 64mm Strong-Drive SCN Connector nails; Screws: 10G x 75mm WSV = model WSV75SA.
  5. CLT panel minimum thickness is three-ply = 105mm
  6. The component of diaphragm deflection due to fastener slip at panel-to-panel joints calculated as δf = CLen, where,
    C = (1/PL+1/Pw )/2
    PL = Length of individual CLT panel
    Pw = Width of individual CLT panel
    L = Overall length of diaphragm
    en = Design load per fastener / Slip Modulus, Y
    (Reference — Applied Technology Council. 1981. Guidelines for the design of horizontal wood diaphragms. Redwood City, CA)
  7. There is a European methodology for determining the integrity rating of CLT butt joints The European formula is below and assumes the gaps in the joint are always less than 2mm throughout. D is the depth of panel (mm) and βo = 0.65mm/min. For a butt joint, the factor is Kj = 0.2. 
    tintegrity = Kj x D/βo
 

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