This qualification represents a landmark in the industry as the assessment covers all major insulation types – polystyrene, mineral fibre and phenolic – for the weber.therm M1 render, mesh-reinforced system. The certification covers both new build projects, using various types of construction methods, as well as for the refurbishment of existing buildings. This is applicable to low rise, traditional or non-traditional construction, or high rise multi-occupancy buildings.
“The specifier, contractor or client, can confidently choose weber.therm XP for use on refurbishment schemes regardless of the size, height or exposure due to the system’s market-leading characteristics in relation to fire performance, impact resistance and windloading capabilities,” comments Wilson Millar, Weber’s Product Manager for External Wall Insulation systems.
As a result of the energy saving initiatives funded by the Carbon Emissions Reduction Target (CERT) and the Community Energy Saving Programme (CESP) aimed at the solid wall hard-to-treat housing stock, the use of EWI is predicted to grow significantly. The BBA has developed a robust process for assessing manufacturers systems and Weber’s unique one-coat technology in the weber.therm XP system is the first to pass these rigorous assessments, the results of which set a benchmark standard for the industry.
In terms of fire performance, the weber.therm XP system with polystyrene (weber.therm EPS) or phenolic (weber.therm PHS) insulation are classified as Class B-s1, d0 or ‘low risk’. When incorporating mineral fibre (weber.therm MFD) insulation; weber.therm XP is classified as Class A2-s1, d0 or ‘non-combustible’ – this important result means that the system can be used in any situation regardless of height, or proximity to a boundary, and is a market-leading classification for the industry.
Impact resistance is important for low rise solutions and here the weber.therm XP system provides high levels of weather protection combined with high impact resistance. When tested during the BBA certification assessment, the system met the requirement for use in Category 1 – which quite simply underlines the materials’ capacity to withstand hard body impacts.
The system also has no restriction in its use in areas of high or severe exposure. weber.therm XP can be designed to resist wind loads and rainfall at all levels of exposure from Sheltered to Very Severe locations.
weber.therm XP uses a specially designed thick one-coat, through-colour mineral render which speeds application and significantly reduces on-site labour and associated access costs. While this high performance system is capable of improving thermal efficiency with U-values well below the 0.35W/m²K standard, contributing to reduced energy consumption and CO2 emissions, the system is responsible for massive improvement in the aesthetics of Britain’s aging housing stock. The system extends the life of existing buildings, especially so-called hard to heat properties, by keeping the old structure warm and stable. The low maintenance through-colour render is available in a range of attractive colours with mineral scraped, mineral textured or dry dash aggregate finishes.
weber.therm XP is a layered system which is quick and easy to install. The insulant is applied in the appropriate thickness to meet the specified U-value which Weber’s technical team will calculate. This is mechanically fixed to a sound substrate with high strength, thermal-break fixings and finished with weber.therm M1 render with meshcloth reinforcement, in a variety of colours and textures.
“We have worked with many significant housing associations in the rejuvenation of their housing stock,” continues Wilson Millar, “including the Shropshire Housing Group who have an inventory of nearly 4.5million properties; Cross Keys Homes who are improving some 600 homes in the Peterborough area; the Changing Streets programme in Goole, and many more. We are really making a difference in these locations.”
Weber offer a comprehensive package of Technical Support Services and will advise on the most appropriate weber.therm EWI system for a project; provide U-value and condensation risk analyses; provide a full Site Application Guide outlining every stage of the process, as well as on-site inspection. Weber can also recommend applicators from a nationwide register of trained installers. Both social and private landlords may be eligible for government funding support and Weber can assist in this process by helping with the administration associated with applying for and securing funding.
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