LOSP treatment helps support termite and fungal-decay protection where the product, treatment level, application and warranty conditions apply. Product claims, treatment scope and warranty periods should be checked against the relevant technical documentation before publication.
*Nails and fixings must be compliant with the building codes. **See Limited Guarantee documents for details.
High-Quality H2 and H3 LOSP Timber Treatments:
25 years of experience in timber treatment.
Specialising in structural, outdoor, and above-ground building needs.
Advanced Treatment Technology:
Utilises Koppers PROTIM Chemicals ensuring superior protection.
Non-corrosive to building code-compliant nails and fixings.
Dimensional Stability and Durability:
Maintains original size, shape, and strength grading.
No drying process required, allowing fast turnaround on orders.
Wide Range of Applications:
Suitable for solid pine and engineered timber like I-Joists, LVL, laminated beams, plywood, framing, and more.
Available in translucent blue and red for easy identification.
Long-Term Protection:
25-year guarantee against termite and fungal attacks.
Water-repellent resin and wax system enhancing stability.
Customization and Expertise:
Ability to treat timber up to 13.2 metres in length.
Custom services for merchants and wholesalers with expert technical support.

Dindas applies product knowledge, technical resources and selected technology systems to support engineered wood products
for Australian construction applications.
Dindas Australia has set the standard in reliability, customer value, and quality for light organic solvent preservative (LOSP) treated timber. Our comprehensive range of treatment classifications caters to both solid pine and engineered timber, including:
No Drying Process Required
Unlike water-based pressure treatments, our LOSP treatment does not increase the timber’s moisture content. This means no additional drying is required post-treatment, allowing the timber to maintain its original size, shape, and strength grading.
Fast Turnaround and Cost-Effective
Our LOSP process enables rapid order fulfilment, eliminating the need for large storage and drying facilities. This translates to a reliable, cost-effective solution for our customers.
Dimensional Stability
The consistent moisture levels maintained during and after LOSP treatment ensure dimensional stability, making it ideal for the precise tolerances required in engineered timber products.
Versatile Applications
Our treatment varies in colour, with the H3 option being the only clear, durable choice on the market. This exclusive clear coat preserves the natural tones of timber, making it perfect for visible applications.
Partnership for Excellence
Treatments used by Dindas are supplied by our chemical partners, Koppers Performance Chemicals. We benefit from their regular specialist audits, ensuring the quality and consistency of the treatments applied to our wide range of products.
By choosing Dindas Australia for your LOSP timber treatment needs, you invest in a solution that combines tradition, innovation, and unparalleled expertise.

From architects and building designers to landscapers and homeowners, you can rest assured that when specifying timber from the treated range for all structural, outdoor, and above-ground building needs.

Dindas Australia’s standard LOSP timber treatments feature a coloured dye coating for treatment range identification and tracing purposes. For optimal results, it is recommended to use acrylic coating options, as the dyes can bleed through many paints and decorative finishes.

All LOSP Timber treatments offered by Dindas Australia feature a specially formulated water-repellent resin and wax system. This solution reduces water absorption during construction, enhancing the timber’s dimensional stability.

Always refer to the label of your finishing product and follow the manufacturer’s instructions for optimal results.
Our commitment to customer satisfaction and product excellence ensures that you always get the best results.

You can confidently use fasteners and hardware that comply with building codes for their intended use. LOSP H2 treatments do not increase the corrosion risk of fixings and fittings, ensuring safety and durability.
Dindas Australia guarantees that their H2F and H2 treated EWP are protected against structural damage from termite attacks for 25 years. However, H2F is specifically designed to protect against termites in areas south of the Tropic of Capricorn, while LOSP H2 is designed for areas north of the Tropic of Capricorn. In Queensland, the Tropic of Capricorn passes through the Rockhampton city area.

This guide provides general information about common timber hazard classes. Available Dindas LOSP treatment services depend on the timber product, application and treatment requirements. Confirm availability and suitability with Dindas Australia before ordering.
H1 Timber Treatment Level | H2F Timber Treatment Level | H2 Timber Treatment Level | H3 Timber Treatment Level |
|---|---|---|---|
<img src="https://dindas.com.au/wp-content/uploads/2024/08/H1-Treatement-Floor-800px.jpg"> | <img src="https://dindas.com.au/wp-content/uploads/2024/08/H2F-Treatment-Beams.jpg"> | <img src="https://dindas.com.au/wp-content/uploads/2024/08/H2F-Treatment-800px.jpg"> | <img src="https://dindas.com.au/wp-content/uploads/2024/08/H3-Treatment-Deck-800px.jpg"> |
Exposure/Usage: Inside, Above Ground, Dry | Exposure/Usage: Inside, Above Ground, Dry – For the South of the Tropic of Capricorn | Exposure/Usage: Inside, Above Ground, Dry | Exposure/Usage: Outside, Above Ground |
Protection against: Lyctid borers | Protection against: Termites and borers | Protection against: Termites and borers | Protection against: Moderate fungal decay, termites and borers |
Typical Uses: Susceptible framing, Flooring, furniture, interior joinery | Typical Uses: Framing, Flooring and similar, Used in dry situations | Typical Uses: Framing, Flooring and similar, Used in dry situations | Typical Uses: Decking, Fencing, Weatherboard, Window Joinery, Fascia, Pergola and similar. |
LOSP stands for Light Organic Solvent Preservative. It is a treatment process used for suitable timber products where the treatment class, exposure condition and application are appropriate.
LOSP treatment can help protect suitable timber against termite and fungal-decay risks when the correct treatment class is selected and the product is installed as directed.
Dindas Australia provides H2 and H3 LOSP timber treatment services. The correct treatment depends on the timber product, application and exposure condition. Refer to the current treatment and product documentation before specifying.
No. The LOSP treatments presented by Dindas Australia are intended for above-ground applications. Select another treatment system where in-ground contact is required.
Yes, where the timber is dry and compatible coating systems are used. Follow current product guidance and coating-manufacturer recommendations.
Dindas can support treatment for long lengths up to 13.2 m where product and treatment requirements allow.
LOSP and CCA are used for different treatment contexts. Choose the treatment pathway by matching the product, hazard class and exposure condition.
Dindas LOSP warranty or guarantee details are found in the current Dindas warranty or guarantee documentation, including product scope, conditions, exclusions and treatment requirements.
Do you have questions about your project or want to speak with an Engineered Wood Products specialist? Contact us now for expert advice and guidance.