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Code 5 – Timber Frame Build- Thurlestone, Devon Residential & Social Housing

The houses were designed using a modular system to enable flexibility, to suit individual tenants and the constraints of the site. There are 2 L-shaped units and 2 terraces which cascade down the sloping site. This way of designing allows a rapid and efficient building and design process. The project achieved Code 5 of the Code for Sustainable Homes in the Design stage.

The build process comprises a passive slab and timber frame system built offsite, which act as an airtight layer to Code 5 specification in the Code for Sustainable Homes (Design stage) and include Passivhaus features to maximise energy efficiency.

These buildings feature mechanical ventilation with heat recovery (MVHR), providing fresh air to every room in the house, while keeping the building warm and keeping heating costs down. Each house features solar photovoltaics (PV), integrated with the aesthetic of the roof’s construction and solar thermal providing 60-70{61202672cc7a6db90e23af640e533e6b03ac74d6f30b3c3caffdd8cfa814fe3f} of annual hot water needs. There is also a rainwater harvesting system to recycle water from the roofs for use in toilets and washing machines.

Specification

Product Performance/U-value Potential benefits
MBC timber frame twin wall 300mm 0.12 W/m2k Increased heat retention
MBC timber frame roof 400mm 0.11 W/m2k Increased heat retention
Munster Joinery Eco Clad Pasivhaus windows 0.86 W/m2k Reduced heat loss
MBC Passive slab 0.9 W/m2k Increased heat retention and thermal mass
MVHR Nuaire™ MRXBOX95-WH1 95{61202672cc7a6db90e23af640e533e6b03ac74d6f30b3c3caffdd8cfa814fe3f} heat recovery, Fan power 0.4W/l/s Improve air quality and heat retention
Kloben Solar thermal 16 Tubes Reduced CO2 and 60-70{61202672cc7a6db90e23af640e533e6b03ac74d6f30b3c3caffdd8cfa814fe3f} hot water
Phono Solar Onyx PV panels 15 panels -3.975 kW – 3204 kWh approx. Reduced CO2 and free electricity
7500L Stormsaver™ Rainwater Harvesting Water usage ≤80L/day/person Water saving from toilet flushing and washing machine
Dwelling Emission Rate DER ≤ 5.57 <ZERO CO2 from heating, lighting, hot water and fans
Code For Sustainable Homes 88 points from 107 – Level 5 Demonstrating exemplar sustainability across the 9 categories