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LDSS Light Diaphragm Spline Strap for Mass Timber

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Product Details
LDSS48 installed with QD WSV75SA Collated Screws
LDSS48 installed with QD WSV75SA Collated Screws
LDSS48
LDSS48
LDSS48 Illustration
LDSS48 Illustration
LDSS48 Installation Set
LDSS48 Installation Set
LDSS48 Installation Side View
LDSS48 Installation Side View

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
 
Brochures & Catalogues

Brochures and Catalogues

PDF icon Flyer - LDSS Light Diaphragm Spline Strap for Mass TimberPDF icon Catalogue - Mass Timber Construction
Technical Data & Docs

Technical Data Sheets

PDF icon Technical Data Sheet - LDSS

Report Links

ESR-2105

Warranty

Warranty

CAD Library

Download

jpg: 
Image icon LDSS48_Detail_Mass_Timber_Floor_Panel_Joint_Installation.jpg
dxf: 
Binary Data LDSS48_Detail_Mass_Timber_Floor_Panel_Joint_Installation.dxf
dwg: 
File LDSS48_Detail_Mass_Timber_Floor_Panel_Joint_Installation.dwg
PDF: 
PDF icon LDSS48_Detail_Mass_Timber_Floor_Panel_Joint_Installation.pdf

Download

jpg: 
Image icon LDSS48_Detail_Installatoin_with_WSV75SA_Side_View.jpg
dxf: 
Binary Data LDSS48_Detail_Mass_Timber_Floor_Panel_Joint_Installation.dxf
dwg: 
File LDSS48_Detail_Installatoin_with_WSV75SA_Side_View.dwg
PDF: 
PDF icon LDSS48_Detail_Installatoin_with_WSV75SA_Side_View.pdf

Download

jpg: 
Image icon LDSS48_Detail_Mass_Timber_Wall_Panel_Splice_Installation.jpg
dxf: 
Binary Data LDSS48_Detail_Mass_Timber_Wall_Panel_Splice_Installation.dxf
dwg: 
File LDSS48_Detail_Mass_Timber_Wall_Panel_Splice_Installation.dwg
PDF: 
PDF icon LDSS48_Detail_Mass_Timber_Wall_Panel_Splice_Installation.pdf

Download

jpg: 
Image icon LDSS48_3D.jpg
RFA: 
Binary Data LDSS48_3D_CAD.rfa
Package icon Download Full Set (6.88 MB)
Alternative Products

Alternative Products

MSTC78 Installation

MSTC Diaphragm Tension Strap

The MSTC is designed to resist tension loads in timber-to-timber applications. This diaphragm tension strap tie utilizes a staggered nail pattern to help minimize timber splitting.

MDCST48 Installation

MDCST Diaphragm Tension Strap

Simpson Strong-Tie tested and load-rated tension straps and fasteners are designed to minimize cost and maximize speed and precision — while providing the strength, versatility and reliability you depend on.

Inspiration

Inspiration

LDSS_Application_01.jpg

LDSS48_Installation.jpg

LDSS48_Installation_2.jpg

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Experience the innovation of Simpson Strong-Tie products and how we can help you build safer, stronger structures. Please fill out your details and submit the form below. We’ll be in touch to provide you a demo and/or send you samples*.

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Structural Connections

 

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With nearly 60 years of field and R&D experience, Simpson Strong-Tie® timber connectors are manufactured to the industry's highest standards. From framing angles to straps to heavy-duty joist hangers, we offer the most diverse product line so that you have the right product for the job.

Simpson Strong-Tie® connectors offer unmatched quality with laboratory and field testing, and are backed by our uncompromising commitment to customer service. As the company that built the connector industry, you can count on Simpson Strong-Tie® to work closely with builders, engineers and building officials to deliver innovative, building code-compliant solutions to help build safer, stronger structures economically. Download the Structural Connectors Overview Flyer.

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From testing to service to availability, everything we do is engineered to ensure your project's success. With every product, you know you are getting the quality, value, service and on-time delivery that we have built our reputation on for the past 60 years.

From straps and ties to joist hangers and much more, Simpson Strong-Tie® structural connectors increase the strength and safety of timber-frame structures. Each connector is unique to Simpson Strong-Tie and is designed for specific applications without the need to adapt metal plating to suit a connection. Download the Timber Construction Connectors Catalogue (2016-2018).