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The Risby

An energy positive home generating three times more energy than it uses, built using modern methods of construction.
Climate Change Mitigation Advancing Net Zero Case Studies

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Project Overview

T丑别听Risby听is听an energy positive home听generating听circa听three听times听more energy than it uses,听through the generation of听 10,000 kW h per annum of renewable energy from integrated solar tiles.听As a result,听the overall听Target CO2听Emissions听Rate is easily surpassed.听听听

A whole house mechanical ventilation听heat recovery unit keeps internal air听fresh without discharging heat.听

All internal and external lighting is LED,听building integrated solar tiles cover the听roof and elevations and a type-2听charging unit makes t丑别听Risby听EV ready.听

It also incorporates a听rainwater harvesting system and a 13.5听kW h battery听for energy storage.听

Location

Net Zero Place, Risby, IP28 6HH, United Kingdom

UK availability

Yes

Date added

May, 2021

Project partners

Designed and built by Grid2.0

Project status

Completed November 2020

Project size

155 m2

Highlights

  • Under average load and climactic conditions,听4,000 kW h per annum is all that t丑别听Risby听needs for internal and external lighting, space听heating and domestic hot water.听
  • U–values for floor, walls, roof, windows and听doors far exceed the Concurrent Notional听Dwelling Specification and Limiting Fabric听Parameters, specified in Building Regulations听approved document L1A.听The values expressed in in W/(m2K) are as听follows: floor 0.12, walls 0.14, roof 0.12, windows听1.00 and doors 0.9.听听
  • With air permeability of 2听m3/(hm2) at 50 Pa and 10,000 kW h per annum听of renewable energy generation from听integrated solar tiles, the overall Target CO2听Emissions Rate is easily surpassed.听
  • The integrated meters and smart home technology measure the on–going operational performance of the building in real time reporting back to the EPA.听
  • Over the next 12 months,听Grid2.0听will commission an independent report to verify the embedded carbon听credentials of the building.听This will include a Lifecycle Assessment.听

Approaches Used

  • Risby听is manufactured听off–site, adopting听modern methods of construction. It is made听primarily from engineered timber, which is durable, sustainable,听structurally reliable and dimensionally stable.听听
  • Grid2.0鈥檚听construction methodology embraces a 鈥減ods and panels鈥� approach where MEP is听factory installed into three-dimensional pods and two-dimensional panels听which听make up听the internal and external wall, floor and roof elements.听
  • The construction palette consists of large format CLT and OSB panels (up to 18听metres in length), engineered joists, closed cell rigid polyurethane and aluminium doors and windows.听
  • The 2D/3D approach to construction provides the foundation for scalable production, which is the stated goal of Grid2.0.

Lessons Learnt

T丑别听Risby听was built as a prototype, specifically to test and learn lessons from the construction process required to build a new home of this standard, with all t丑别听associated process risks inherent with off-site construction. Ultimately, the key lesson was to establish the cost of building to this specification.听听听

听In summary, we found that:听

  1. The pods and panels 鈥� or 2D/3D building model 鈥� can substantially improve t丑别听speed听and cost of new buildings.听听
  1. BIM led design is an important pre–cursor to a smooth construction process.听
  1. BIM literate production teams enjoy the process and complete tasks quickly.听
  1. The net cost of the building is lower than a traditionally built alternative 鈥� in all departments: design, labour, materials and overheads.听听

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