Air Quality & Ventilation (MVHR) Feature What is PAS 2035?


Richard Jenkins of Nuaire explains what PAS 2035 is, and how local housing authorities can improve their ventilation strategies


practice guidance for domestic retrofit projects. The framework came into effect from June 2019 following the


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recommendations of the Each Home Counts review, whose purpose was designed to determine better processes for the retrofit of both energy-efficient and renewable-energy measures. It specifies the following requirements:


 The assessment of dwellings for retrofit improvements (such as ventilation, heating, and hot water)


 The identification and evaluation of improvement options (Energy Efficiency Measures or EEMs)


 The design and specification of EEMs (whether individual measures or packages of multiple measures)


 The monitoring and evaluation of retrofit projects  The installation, commissioning, and handover process  The insulation of building fabric elements and airtightness  The provision of efficient heating and cooling systems with smart controls, including systems using low or zero carbon (LZC) technologies


Sponsored by the UK Government's Department for Business, Energy, and Industrial Strategy (BEIS), PAS 2035 works towards achieving the Near Zero Energy Buildings (NZEBs) target in-line with new EU objectives.


HOW IS PAS 2035 DIFFERENT? PAS 2035 delivers guidance on whole-home quality retrofit work to eliminate problems associated with defects, shallow retrofit, and poor design. By considering the entirety of the property and the environment and tenant lifestyles, no one improvement is made in isolation which can unintentionally damage the overall building performance. This PAS covers such work as:


 Retrofit programmes promoted or funded by national or local government schemes, e.g. the Energy Company Obligation (ECO)


 Retrofit programmes initiated or funded by landlords, including social housing organizations, private landlords in the domestic sector and commercial property portfolio holders


 Retrofit of individual buildings by their owners or occupants, including both domestic and commercial owner-occupiers


 A retrofit that is integrated with and forms part of broader repairs, maintenance, and improvement (RMI) activity related to individual buildings or building stocks.


Furthermore, five new retrofit roles with clear responsibilities and accountabilities have been established to ensure that individuals deliver quality throughout. PAS 2035 specifies the retrofit roles as follows:


 Retrofit Advisor  Retrofit Assessor  Retrofit Coordinator  Retrofit Designer  Retrofit Evaluator  Multiple Roles


Each role must have a suitable qualification to be valid. Within this framework, TrustMark holders must comply with this standard when carrying out any domestic retrofit work. All other standards referred to in this PAS are also part of the retrofit standards framework.


PAS 2035 AND TRUSTMARK TrustMark has been established as the new quality mark within the retrofit standards framework and supported by an Industry Code of Conduct, a Consumer Charter, and a framework of technical standards for retrofit. Those who hold the TrustMark are qualified under an operating framework


and can demonstrate to consumers that they have the skills and knowledge to deliver the best practice standards and trading practices in the sector.


PAS 2035 AND VENTILATION Good ventilation is critically important to the health of the property and its inhabitants. As air flows through a building, it dilutes the build-up of indoor air pollutants such as condensation dampness, mould, Volatile Organic


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AS 2035 is the latest publicly available specification for low-energy domestic retrofit from the British Standards Institution (BSI). It provides the specification for the retrofit of domestic buildings and details best


Efficiency


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