Case Studies

Case Studies

Cedar House: an award winning, ultra low energy home: Outperforms all predictions

This project is a great example of keeping things simple. Built in Ditcheat, Somerset, the house won "Build It's Best Eco Homes" in 2014 for its performance and simplicity.

By using  a super insulated building fabric, solar PV and solar thermal the clients enjoy a stress free retirement with total energy costs of <£80/year.  and total net energy usage of <10.7kwh/m2/yr.

This is despite SAP predicting the bill for heating and hot water alone would be £1575.

Following Passivhaus principles, this house faces south, U values of 0.11wm/2k though out, triple glazing and air-tightness of <0.6 ach.

Not only is the design and structure simple but the heating system is too. the home uses a Solar thermal array facing west, and solar PV facing south to generate energy, and Logix XRV6-8 blocks to minimise heat loss.  Heating is provided by a small section of electric UFH, which the owner fitted "just in case" and the hot water is topped up by an immersion heater.

No boilers to maintain or replace, no radiators, no noisy heat pumps.  Simplicity itself.
Key Facts:
Walls: Logix XRV6-8, u = 0.11w/m2k
Ground floor: Isoquick PH certified raft foundation
Heating:   Electric UFH and Immersion
GIFA: 145m2
Architect: Della Valle

Chewton Medip: The future of housing

Built in 2009 as Zero carbon housing was starting to take shape these Logix homes prove what can be done to save energy and CO2 on tight budget. 

The Client’s view:

“These were built to rent out, so low maintenance costs and long term performance were important to us, but we also wanted to build something that uses as little energy as possible.

Planning restrictions meant that we couldn’t use any roof mounted technology to generate energy, no solar panels or wind turbines here, so insulating properly was only option. 

We wanted to create a thermal envelope around the house. We also knew that due to the orientation of the site achieving a certified Passivhaus design would be difficult.

We set out to follow Passivhaus principals, in terms of ensuring the building was as well insulated and air tight as possible, and using Logix ICFs made that easy for us.

We combined the Logix walls, with triple glazed windows, concrete floors and a sips roof, and were delighted to match the Passivhaus target for air-tightness at our first attempt. 

With a very low predicted heating demand we chose to use a combined MVHR and air-source heat pump system, from Genvex. Which eliminated the need for UFH or radiators.
Having completed the builds the real vindication or what we achieved has been the running costs. 

Without any solar panels, these homes exceed the Passivhaus standard for heating, and primary energy use, costing less than £8/ month to heat.”

Read Ashley Seagar's article in the Observer
Read Architect David Hayhow's project review
Key Facts: 
Terrace of 3 units, from 80 -120m3 GIFA
External Walls: Logix XRV6-5
Party Walls: Logix Contractor6 
Ground Floor: Slab on Insulation
Intermediate floors: Cast concrete
Heating, HW & MVHR :  Genvex Combi 185

Passivhaus Student Services Building

Built by Morgan Sindall to house the Student Services department for the Arts University Bournemouth this impressive building is the welcoming doorway to education for the new students.

Built around a retained steel frame building the levels of insulation had to be significant to achieve the levels required by the passivhaus standard.

Using Logix made this simple by using a combination of XRV panels to give U values down to 0.09w/m2k behind the brick façade, with thinner panels behind the cladding.

Details like the large wall panels above the corner window, were built simply with a reinforced concrete core, without the need for steel frame.
Key Facts
Architect: Design Engine
External Walls: Logix XRV6-8/4
Party walls: Contractor6
GIFA: 735m2

Code Level 6 housing that outperforms

This development of 6, 2 bed terrace houses and 3, 1 bed apartments was the 1st Code for Sustainable house, Code level 6 ( net zero carbon) built in Derby.

Built using Logix XRV6-5 blocks for the external walls these homes are designed to produce a net positive carbon contribution and total energy usage of <60kwh/m2/yr. the homes are subject to ongoing monitoring as part of a research programme at Loughborough University and results to date are measurably outperforming the design predictions. 

Notable features include the  primarily un-reinforced design, including a 27m  by 5m rear wall, 1st floor concrete cantilevered bay detail, timber 1st floors (in the houses), spanning party wall to party wall without effecting noise performance and un-reinforced party walls.

Key Facts:
6 2 bed and 3 1 bed apartments
External walls:    Logix XRV6-5
Party walls:    Logix Contractor6
Floors:    Timber (houses) preacsst concrete (apartments)
Finishes:   Polymer render and Timber cladding


Video from Building the in the sticks with Bryan Baeumler

Logix survives hurricane Sandy
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