Val-U-Therm® Hybrid SIP System

What are Val-U-Therm® Hybrid SIPs?

Environmentally friendly and sustainable Hybrid Structural Insulated Panels with insulation manufactured from recycled vegetable oil.

Val-U-Therm® Hybrid SIPs provide a winning solution for self-build projects as they offer a straightforward and cost-effective way to build a house that is exceptionally cheap to run.

By combining the best of conventional SIPs (structural insulated panels) and the best of timber frame technology Val-U-Therm® can be adapted to a wide range of architectural styles and can therefore deliver self-build homes that reflect the style and meet the aspirations of their owners.

Why choose Val-U-Therm®?

  • Environmentally friendly – manufactured from 86% bio-oil
  • Class leading performance (achieving U-values between 0.09 W/m2K and 0.25 W/m2K)
  • Quality controlled manufacturing process
  • The Val-U-Therm® mixture is injected into timber frame panels in precisely measured quantities to ensure that the correct density is achieved and every cubic millimetre is filled with the class leading insulation foam. Use of this system produces better, more consistent, practical performance than using preformed insulation.


Thermal Conductivity and U-Values

Thermal Conductivity and U-Values

Val-U-Therm® has exceptional insulating properties and can achieve a top-of-the-range thermal conductivity λ-value of 0.025 W/mK.

U-values measure how well a building component keeps heat inside a building. Val-U-Therm® can achieve thermal insulation U-values in the range 0.09 W/m2K to 0.25 W/m2K. Panels are available in a choice of configurations and stud sizes – which allow customers to select the panel thickness and thermal performance characteristics they require.

Val-U-Therm®’s U-Values are calculated using the BRE U-Value Calculator Version 2.03 (which is a calculation method consistent with BSEN ISO 6946). Values are available for timber fraction for walls of 8.5% only.

Val-U-Therm® panels have been assessed to prove there is a minimal condensation risk. Computer modeling of this aspect has been carried out for all typical configurations using ICond Calculator version 2.03a to calculation method BS EN ISO 13788. This information is available from our associate manufacturers if required.

Thermal Bridging

Val-U-Therm® has been optimised to reduce thermal bridging and a range of performance characteristics can be specified. (Thermal bridging is where heat flows through the path of least resistance in an insulating layer.)

Val-U-Therm®’s associate manufacturers can provide a full set of technical details for non-repeating thermal bridges, which have been thermally modelled using HEAT 2 and HEAT 3 software. These programs are validated against the EN ISO 10211, EN ISO 10077-2 and EN ISO 10211 standards.

Air Permeability

Val-U-Therm® adds an additional level of air permeability performance on top of that provided by a conventional vapour control layer. This means that, by using Val-U-Therm® airflow in a building can be carefully controlled to remove drafts and reduce the leakage of heat. This provides the opportunity to manage the quality of the air with a mechanical ventilation and heat recovery system.

Air permeability testing is used to assess uncontrolled airflow through a building. Val-U-Therm® will typically deliver a class-leading air leakage rate of less than 3m3h-1m-2 at a pressure difference of 50 Pa. It can also be specified to meet PassivHaus requirements of an air change rate of less than 0.6h-1.

Environmental and Sustainability Credentials

Ozone and Global Warming Potential

The insulation used in Val-U-Therm® has zero ozone depletion potential (ODP). It is virtually ‘carbon neutral’. It is also CFC (chloroflourocarbon) and HCFC (hydrochloroflourocarbon).

Bio-based Insulation

Val-U-Therm® contains an insulation polymer (polyol) derived from recycled renewable vegetable oil. This polyol has an 86% Bio-based content based on independent testing to ASTM-D6866 by Beta Analytics in the USA.

Full ‘eco profiles’ are available for the two manufacturing constituents of the insulation and the final insulation product itself. These profiles assess key ‘life cycle’ aspects, including the raw materials they use, the fuel required to produce them and the pollution their manufacture is responsible for.

Timber Sustainability

All of the timber in Flight Homes panels comes from renewable sources accredited by the Forest Stewardship Council (FSC) and/or PEFC (the world’s largest forest certification organisation).

BRE Green Guide Rating

The timber frame and insulation technology used in Val-U-Therm® delivers an “A/A+” BRE Green Guide Rating (depending on the cladding used).

This rating is part of the BRE Environmental Assessment Method, an accredited environmental rating scheme for buildings. It provides a straightforward assessment of which specifications within an element group have the lowest environmental impact. Those with A+ ratings have the lowest possible overall environmental impact.


Val-U-Therm® panels and the timber and insulation it is made of can be reused a number of times. At the end of their final service life, panels and their constituent parts can be incinerated in a clean, controlled manner for energy as a substitute fossil fuel.

Durability and Structural Performance


The insulation in Val-U-Therm® panels is effectively hermetically sealed and therefore has an almost indefinite lifespan. BBA certificate number 12/4892 notes the panels will have a 60-year service life provided they are protected from damage by the external and internal finishes.

Structural Performance

Val-U-Therm® is so strong that even patio doors and large panel windows can be factory-fitted. It can be designed to provide the structural integrity needed for a wide range of buildings – from bungalows to seven-storey structures.

Fire Safety

Val-U-Therm® has undergone independent fire testing by BRE Global for 30-minute and 60-minute resistance to BS 476 : Part 20/21 : 1987. An assessment of the fire resistance of a range of Val-U-Therm® wall systems has also been carried out by BRE.



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Roof Panels

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Building System

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Why Choose Flight Timber Structures?