Pre Insulated Panels
Efficient, precise, and performance driven.
The Delta system from Donaldson Timber Systems is a pre-insulated timber frame panel that bridges the gap between open panel flexibility and closed panel performance.
Designed for developers, housebuilders, and contractors seeking faster build times, improved energy efficiency, and assured quality, Delta combines the benefits of offsite manufacture with practical on-site adaptability.
Manufactured in our offsite manufacturing facilities, each panel is engineered for accuracy and pre-fitted with high-performance insulation to deliver reliable thermal performance, reduced site labour, and exceptional build quality.
What Is Delta?
Delta is a pre-insulated timber frame panel system, meaning that the structural framing, sheathing, and insulation are all completed offsite in a controlled factory environment.
The panels are delivered to site ready for erection, providing an immediate thermal envelope that speeds up the build process and enhances quality.
Key features include:
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Factory-fitted insulation for consistent thermal performance.
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Structural timber frame panels with precision-engineered sheathing.
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Compatible with a range of external claddings and internal finishes.
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Reduced on-site labour – no need to install insulation post-frame.
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Achievable U-values typically between 0.18 and 0.13 W/m²K.
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Fully compliant with Future Homes Standard and building regulations.
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Certified through NHBC Accepts, STA Gold Standard, and manufactured under ISO 9001, 14001, 45001.
The efficient choice for performance and speed
Delta offers a cost-effective route to higher-performing, energy-efficient homes without the complexity of a full closed-panel system.
Faster build times – panels arrive ready to erect with insulation pre-installed.
Reduced drying time – homes become weather-tight sooner.
Lower site labour demand – fewer trades required for wall completion.
Predictable quality – factory-controlled insulation placement prevents gaps and cold bridges.
Improved productivity – just-in-time delivery supports efficient sequencing on multi-plot sites
Benefits of the Delta Pre-Insulated System
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Enhanced thermal performance
Consistent, factory-installed insulation achieves lower U-values with ease.
Faster build programme
Reduced site time and earlier first-fix start.
Reduced labour and waste
Less on-site insulation work and fewer materials handled.
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High quality and
accuracy
Precision engineering and automated manufacturing for every panel.
Future Homes Standard ready
Meets upcoming energy and air-tightness regulations.
Sustainable
solution
Renewable structural timber and efficient factory processes support low-carbon and net-zero goals.
When to choose Delta
Delta is ideal for:
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Private and affordable housing schemes requiring improved thermal efficiency.
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Developments seeking faster delivery with reliable, pre-manufactured components.
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Projects balancing cost and performance, where open panel systems need an upgrade but closed panels exceed the specification.
With the perfect balance of value, speed, and performance, Delta helps customers achieve high-quality results with predictable outcomes.
Assured quality and accreditation
Every Delta panel is manufactured under Donaldson Timber Systems’ accredited management systems:
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NHBC Accepts for warranty approval.
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ISO 9001 Quality, ISO 14001 Environmental, and ISO 45001 Health & Safety certifications.
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STA Gold Standard for manufacturing assurance.
Each system undergoes rigorous in-house and third-party testing to verify structural strength, thermal performance, and long-term durability, giving customers complete peace of mind.
Building a low-carbon future
Using structural timber sourced from responsibly managed forests, Delta contributes to the creation of low-carbon homes and supports the UK’s net-zero objectives.
Offsite manufacture reduces waste and on-site disruption while enhancing health and safety — demonstrating how automation and precision engineering can drive the future of sustainable housebuilding.
Delta by Donaldson Timber Systems – efficient, adaptable, and designed for performance.
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