PLT Panel Specifications

Technical specifications for Woodspan PLT Panels:

  • Timber species: NZ grown Radiata pine
  • Panel size: Maximum 7200mm × 890mm
  • Panel depths: 90mm, 117mm, 140mm
  • Adhesive: Purbond clear polyurethane
  • Appearance: Visual & Non-visual
  • Treatment: Untreated, or preservative treated to hazard class H3.1 or H3.2
  • Surface protection: Factory-applied water-based surface sealer

Design & Install Guide

Woodspan PLT have published a design and install guide to aid with the specification, engineering, and design of floors and roofs constructed using the PLT system. This includes but is not limited to information on span capacity and material properties of Woodspan PLT panels, connections and dynamics.

Woodspan PASS™

A PASS™ is a Product Assurance Supplier Statement.

A PASS™ makes a clear, rigorous statement that Woodspan PLT panels comply with all the necessary regulations and legislation. It also summarises Woodspan PLT panels scope of use and any limitations. Download here.

Quality Assurance

Manufactured by Taranakipine, Woodspan PLT has stringent quality assurance processes in place to monitor the structural and visual requirements of its products:

  • Woodspan PLT is manufactured from renewable plantation Radiata pine grown in New Zealand.
  • Woodspan PLT is independently audited by Grade Right (NZ) Ltd under the Grade Verified QA Programme for SG8 and SG10 structural timber and under the Treat Right QA Programme for LOSP and CCA treatment.
  • Woodspan PLT is independently third party audited by AsureQuality for Compliance with Finger Jointing and Glue Laminated Standards.


Woodspan PLT does not recommend the use of exposed Woodspan PLT for external applications or in ground contact. Woodspan PLT are available either untreated, or depending on the required hazard class, treated to H3.1 or H3.2 and should be installed as per NZS3602. For further guidance please refer to our Design Guide.


Woodspan PLT performs well in fire due to a charring layer which forms when exposed to fire. Woodspan PLT burns in a slow and controlled manner (0.65mm/min as per solid timber, NZS3603). The PUR adhesive used in the bonding of the elements is sufficiently protected by the insulating properties of the adjacent timber laminates such that the adhesive maintains its integrity during a fire and does not delaminate. Calculation of fire resistance must be performed by a suitably qualified engineer.


Woodspan PLT panels are solid; therefore mitigating sound transmission needs careful consideration at the design stage, especially when specific acoustics are required. There are two sources for sound transmission through timber floors: airborne sound (STC) stemming from sources such as acoustic speakers or human voice, and impact sound (IIC) through direct impacts on the building structure, such as footsteps on the floor.

The NZBC Clause G6 sets standards for building elements to prevent excessive noise transmission to other occupancies or common spaces. Where there is a requirement for a building to meet NZBC Clause 6; airborne and impact sound standards, buildings must achieve minimum STC and IIC values to ensure compliance. Refer to our Woodspan PLT design guide for further details.


Woodspan PLT is available in two appearance grades; visual and non-visual.  The solid timber raw material that is used in Woodspan PLT manufacture may have knots and visual characteristics typical in natural timber. The visual characteristics of the raw material are assessed during manufacture for production of the two grades. Structural panel performance is not affected by the appearance grade or presence of any visual blemishes. The appearance grade should be determined and agreed prior to manufacture. Once onsite consideration needs to be given by the design and construction team to ensure visual grade Woodspan PLT panels are not compromised.