PAS 2035: 2019 HAS BEEN DEVELOPED AS A FRAMEWORK DOCUMENT AIMED AT GUIDING THE ENERGY RETROFIT OF DOMESTIC BUILDINGS IN THE UK. It WAS ESTABLISHED TO PROVIDE BEST PRACTICE FOR THE ENERGY RETROFIT PROCESS - AS PART OF THE ‘EACH HOME COUNTS’ PROCESS IN CONJUNCTION with TrustMark.
- Air Tightness Testing – Although only mandatory in a pathway C project, air tightness can be a great way in which to see the efficiency of a building. The tighter a building, the less energy is wasted to heat and keep a building heated.
- Ventilation Testing – leading on from air tightness, it is important that if thermal insulation and air tightness is improved it is not a detriment of the building's ventilation - “Build Tight, Ventilate Right.”
- SAP/PHPP – Pathway B requires an estimate of fuel usage so a SAP or PHPP (for passive house projects) will be required.
INADEQUATE VENTILATION SYSTEMS
The PAS 2035 ventilation assessment is part of the whole dwelling assessment. The existing ventilation is deemed inadequate if one or more of the following is apparent:
- There is evidence of mould and/or condensation in the dwelling.
- There is no ventilation system, or the ventilation system is incomplete or non functional.
- There is no provision for purge ventilation of each habitable room (e.g by opening windows) - as recommended by the building regulations approved document F.
AN ADEQUATE & COMPLETE VENTILATION SYSTEM IS:
- An Intermittent Extract Ventilation (IEV) System consisting of fans in all wet rooms and background ventilators (to admit fresh external air) in all living spaces and bedrooms.
- A whole-house supply and extract Mechanical Ventilation with Heat Recovery (MVHR) System that continuously extracts moist stale air from wet spaces and supplies fresh air to living spaces and bedrooms.
- A continuous Positive Input Ventilation (PIV) System supplying fresh air and background ventilators (to allow moist, stale air to escape) in all other rooms.
- A Passive Stack Ventilation (PSV) System consisting of passive stacks extracting air from all wet rooms and background ventilators (to admit fresh external air) in all living spaces and bedrooms.
- A continuous Mechanical Extract Ventilation (MEV) System that extracts moist stale air from all wet rooms combined with background ventilators to admit fresh external air to all living spaces and bedrooms.
Get in touch with a member of our team to discuss your PAS 2035 requirements.
