Design KLH® – CLT to CSA O86

KLH (KLH Massivholz GmbH, Austria) manufactures Massivholzplatten cross-laminated timber. In Canada it is designed to CSA O86, using KLH’s Canadian structural design data and rated to ANSI/APA PRG-320. SPEC Toolbox designs the panels to CSA O86, in limit states design.

The integration covers KLH Massivholzplatten CLT, crosswise-glued spruce laminations face-bonded with a formaldehyde-free polyurethane structural adhesive, in the CV1M1 grade.

• 3-, 5-, 7- and 8-ply layups, in TL (floor and roof) and TT (wall) orientations, 60 to 320 mm thick.
• Panels up to 3.5 m wide and 16.5 m long.
• Non-visual, industrial-visual and domestic-visual surface qualities; PEFC and FSC certified.

At a glance, in the Canadian scope the KLH panels support:

• Load-bearing floors, roofs and walls.
• Limit states design (LSD).
• Dry service (in-service equilibrium consistent with a 12 percent delivery moisture content).

• An extensive layup range in two orientations. 3-, 5-, 7- and 8-ply build-ups in both TL (floor/roof) and TT (wall) orientations, to 320 mm thick, each with factored moment and shear resistances and effective stiffness in the major and minor directions.
• Large panels. Panels reach 3.5 m wide and 16.5 m long, for wide floor and roof plates and full-storey walls with fewer joints.
• Full LSD design data. KLH publishes Canadian unfactored LSD capacities and preliminary-design span tables for floors and roofs, with deflection, vibration and fire checks to CSA O86.
• Fire design to CSA O86 Annex B. Fire is designed by the residual-cross-section method of CSA O86 Annex B, with ASTM E119-tested assemblies to 2 hours and a Class B flame-spread classification.

The KLH panels are available across the SPEC Toolbox CLT modules, worked to CSA O86:

• CLT floor and CLT wall.

and in the connection modules:

• the screw connection module and the panel-to-panel connection details (spline, butt joint and half-lap);
• CLT floor-to-glulam beam, CLT floor-to-floor and CLT wall-to-wall connections.

Panel behaviour is taken from the integrated database with KLH’s Canadian LSD design values.

Design follows CSA O86 (CSA O86:24, Engineering Design in Wood, limit states design) under the National Building Code of Canada. KLH’s Canadian structural design data, rated to ANSI/APA PRG-320, provides unfactored LSD capacities for the CV1M1 grade: factored moment and shear resistances, effective bending and shear stiffness, and edgewise (in-plane) shear, in the major and minor directions. Factored resistances are obtained with the CSA O86 modification factors, with the load-duration factor applied for the governing load combination and the size factor not applied; a creep factor of 2.0 is used for long-term deflection. The evaluation is for dry service; fire is designed by the residual-cross-section method of CSA O86 Annex B. Connection design is completed by the engineer using the fastener manufacturer’s data.