Status

  • Approved

Type

  • PM Design
  • PM Manufacture
  • Construction

Technology

  • Net Zero Ltd Structural Insulated Panel Building System

Net Zero Buildings (NZB), is a well-established and highly regarded provider of turnkey solutions for the education sector. We are a specialist off-site constructor utilising a suite of components which provide the time and cost benefits of standardisation whilst retaining design flexibility to meet bespoke requirements. Our construction methods, design and materials selection offer a genuine alternative to traditional construction whilst producing an intelligent building with a 60-year design life that is delivered quickly with minimal disruption. Of our 68 projects to date 67 have been for schools and range in size from 56m² to 2,300m².

All our projects are manufactured in our off-site facility in Newmarket. We utilise an innovative “2D – 3D” mix of large panel format and volumetric units to maximise off-site construction whilst limiting vehicle movements and storage requirements. Construction materials, M&E and design all focused on reducing ongoing power consumption delivering very low running costs.

We have produced the most energy efficient school buildings in the UK, those with PV panels all achieve A+ ratings and better than neutral carbon emissions. Chalgrove Primary School in London obtained the most efficient EPC certificate in the education market with a A+ rating of -83.

Net Zero Ltd Structural Insulated Panel Building System

The system comprises two skins of 12mm OSB/3 separated by a core of zero rated Ozone Depleting Potential (ODP) rigid polyurethane insulation.

Overall panel thickness ranges from 75mm to 250mm. 100mm and 150mm thick panels are generally used in the Net Zero Ltd system.

Panels are supplied in factory cut shapes and sizes in accordance with the design of the building being constructed, including openings for windows, doors and the like, together with any fixings and jointing pieces as may be required.

Durability Assessment: Minimum of 60 years

Limits of Scope

  • Maximum 2 storeys + room-in-roof.
  • Bottom members minimum 150mm above external ground level.
  • Minimum 25mm ventilated cavity behind external non-masonry wall claddings.
  • Masonry claddings require a minimum 50mm ventilated cavity.
  • Adequate sub-floor ventilation must be maintained to the void below suspended ground floors (where specified), in particular where there is no treatment of the ground to prevent moisture entering the void.
  • Conventional cladding, such as timber cladding, should have a minimum 25mm drained and ventilated back cavity.
  • Rendered external thermal insulation systems and/or insulated brick slip cladding systems applied to timber-framed structures must have a minimum 15mm drained and ventilated back-cavity OR, in the absence of a cavity, any such application must be assessed to confirm that moisture accumulation would not exceed normal criteria for the avoidance of material degradation in the site specific climatic conditions likely to be experienced, evidenced by: a) Testing, eg MOAT 22 hygrothermal test or, b) ETAG 004 assessment, or c) Dynamic modelling, e.g., WUFI hygrothermal modelling (including 1% moisture penetration stress). Detailing should be considered to minimise the risk of water entering the structure at vulnerable junctions, for example window jamb/sill junctions.
  • Net Zero Ltd. Ltd must be contracted for the design, manufacture, supply and erection of the structure.
  • A chartered structural engineer suitably experienced in the design of this type of structure must be sub-contracted for the structural analysis and design
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