Val-U-Therm has class-leading performance specifications. It therefore provides a straightforward route to meet the highest environmental and thermal standards and ‘future proof’ a building against upcoming regulations.
Val-U-Therm has been the subject of extensive testing and is well proven in practice. Val-U-Therm’s associate manufacturers can therefore provide all relevant information for the most stringent environmental evaluations, including those for Energy Performance Certificates, SAP and PassivHaus assessments.
For details of Val-U-Therm’s performance specifications see the relevant section below:
Thermal Conductivity and U-Values
Val-U-Therm has exceptional insulating properties and can achieve a top-of-the-range thermal conductivity (lambda declared) λD-value of 0.025 W/mK. Val-U-Therm PLUS can acheive a lambda declared of 0.022 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 0.08 W/m2K to 0.23 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 four different wall stud sizes: 90mm, 140mm, 184mm & 235mm and for a range of roof rafter depths and floor joist depths.
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.
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. Many of our details have been independently third party assessed by C4Ci.
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
All of the timber in Val-U-Therm comes from renewable sources accredited by the Forest Stewardship Council (FSC) and/or PEFC (the world’s largest forest certification organization).
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. Val-U-Therm BBA certificate number 12/4892 and Val-U-Therm Plus BBA Certificate number 17/5421 note that the panels will have a 60-year minimum service life provided they are protected from damage by the external and internal finishes.
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.
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.