Location: King Street, Great Yarmouth
Client: Great Yarmouth Council
Project Description: The King Street retrofit in Great Yarmouth was undertaken on a block of six flats owned by Great Yarmouth Borough Council. This block was chosen for the project due to its traditional 1950s style, a common typology across the UK, and thus any solutions to the challenges presented by this R&D project will be able to be rolled out across the country more widely.
For this retrofit we have developed and trialled a new bracketed system that we believe is a fast, efficient, and cost-effective solution to deep retrofit that can be adapted to suit any of the UK’s mixed typology of housing. The results have been excellent, and the system’s versatility has been proven.
New triple-glazed windows have been installed within the cladding system, along with an individual Mechanical Ventilation with Heat Recovery (MVHR) system for each flat, to maximise the benefit of the retrofit with regards to achieving target CO2 and energy bill reductions. The aim is to reach the Passivhaus retrofit standard (EnerPHit), meeting a space heating demand of 25 kWh/m2 and an airtightness of less than 1 ach-1 @50Pa.
The main challenges we faced:
We implemented a number of new innovations to ensure the success of the retrofit, including:
Over the lifetime of the new building, we expect a 75% reduction in heating demand and subsequently energy bills for residents. We will be working with Oxford Brookes University to monitor energy use and air quality in the building for the next year.
Wall U value: 0.11 W/m2k
Roof U value: 0.11 W/m2k
Perimeter Floor U value: 0.12 W/m2k
Air Tightness: Below 1/hm2@50pa
The Retrofit Research Project was a collaboration between Beattie Passive, Oxford Brookes University and Enhabit under the BEIS Thermal Efficiency Fund.
“I haven’t had to use my heating all year. I’ve even had my energy provider call me up to enquire why my energy use is so low.” – Paul, Flat 90
“I used to have mould and condensation in my living room, kitchen and bedroom, but now that’s all gone. I don’t have to use the heating very much now either, and when I do its only for an hour or so.” – Lina, Flat 90a
“I used to get condensation on my windows, so much that I had to use a dehumidifier, but since the retrofit I’ve been able to put that away as it doesn’t happen anymore. It’s also much warmer in the flat.” – Mrs Mitchell, Flat 90b