AECB Member Services : ColdProof - Eric Fewster

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Principal Contact Eric Fewster
Address 17 Hersey Street Salford Greater Manchester M6 5GT England
Phone 07814788846

Legal Details

Date established 2012
Legal status Sole trader
Membership of Professional Bodies Certified European Passive House Consultant Chartered Water & Environmental Manager (C.WEM)
Chartered Environmentalist (CEnv)
Number of People in the business 1

Profile : ColdProof - Eric Fewster

Business Sector

Building design/project management

Business description

Energy efficiency action plans for refurbishment of old houses.

I carry out accurate & detailed baseline energy analysis using Passive House methodology and thermal bridge modelling, followed by an action plan of improvements that enables individual homeowners to plan for specific space heating demand or carbon emissions reduction targets.

The action plan is not only the result of the energy analysis – it also includes a likely list of materials needed, sequence of work & economic analysis, which is all arrived at through several iterations in consultation with the homeowner.

In specific cases, I can also take on the role of project manager.


Certified Passive House Consultant


Company philosophy

1. I aim to function with the underlying principles of accuracy, attention to detail, honesty, transparency and perseverance. Retrofitting old houses properly requires all these traits, which are largely in short supply in the current UK building industry.

2. I aim to assist individual homeowners, which I believe is necessary if the UK is going to reach its carbon targets. While it might seem slow and laborious to target individuals, I believe it is essential that there are energy planning services that individuals can access which are both accurate and interactive, and which can be honed according to available budget.

3. I aim to encourage and support homeowners who are able and willing, to do their own project coordination which will in turn improve cost efficiency of retrofit projects.

4. I aim to give 10% of profits as a donation to BushProof (, to be used for providing clean water sources to rural villages in Madagascar. In 2005, I helped co-found BushProof, an award-winning for-profit humanitarian business based in Madagascar, which is now one of the leading private sector enterprises involved in water supply provision in the country.

Materials Sourcing

All wood used on projects I coordinate is to be FSC-certified.

AECB CarbonLite training

AECB Carbonlite Retrofit Training
Eric Fewster successfully passed the CarbonLite Retrofit training course in January 2018
The CarbonLite Retrofit Training Course is an online course on low energy building retrofit and methodology. Read More...

ColdProof - Eric Fewster : Projects

Mid-terrace retrofit, Hersey Street, Salford

Project Date 2009
image of Mid-terrace retrofit, Hersey Street, Salford
scope Whole house retrofit on my own house, that I project-managed myself. Certain parts of the work I did myself, while other work was given to local tradesmen.
measures included:
- Internal wall insulation on external-facing walls using studwork and polyisocyanurate
- Roof insulation (loft, bay window, bathroom) through combination of mineral wool and polyisocyanurate
- Suspended floor insulation using polyisocyanurate
- Full dampcourse on ground floor
- Mechanical Ventilation with Heat Recovery
- New windows (PVC argon filled) and doors
- Wood-burning stove
- New condensing boiler, radiators, TRVs and lagged pipework
- Water saving toilet, sink & bath
monitoring Baseline before improvements: Space heating demand 248.8 kWh/m2/year, Carbon emissions 107.7 kg/m2/year.
After improvements: space heating demand 78 kWh/m2/year, Carbon emissions 42.9 kg/m2/year, representing a 69% and 60% reduction respectively compared to baseline situation.

Kitchen extension & porch retrofit, Rosemead Drive, Oadby

Project Date 2013
image of Kitchen extension & porch retrofit, Rosemead Drive, Oadby
aims To insulate and make airtight the kitchen and as part of a larger longer-term strategy for energy efficiency for the whole house, and to carry out other related works such as project managing installation of new kitchen
measures included:
- Internal wall insulation with studwork and polyisocyanurate, followed by services zone
- Pitched roof & flat roof insulation with polyisocyanurate
- Suspended floor insulation with polyisocyanurate
- Solid floor insulation with polyurethane boards on cement-based adhesive
- Loft insulation with mineral wool, followed by construction of raised boards for storage
- Airtight membranes installed on warm side of all insulated surfaces (except loft)

Mid-terrace retrofit, St Georges Road, Manchester

Project Date 2013
image of Mid-terrace retrofit, St Georges Road, Manchester
scope Whole house retrofit that I planned, project-managed, and also worked on in capacity as builder together with local tradesmen.
aims To carry out a whole house retrofit in order to primarily create a comfortable place to live in for the client (cold and draughty before) while slashing space heating demand and carbon emissions as far as possible given the budget limitations.
measures - Internal wall insulation on external-facing walls (80mm wood fibre), & mineral paint (Keim Lotexan) applied to external brickwork to reduce driven rain ingress into bricks. Airtightness membrane and batons then formed the service zone, finished with plasterboard and breathable paint.
- Airtightness: membranes (Intello) on external-facing walls and ceilings, plastering all unplastered brickwork on party walls, plastering & taping around joist ends, blocking up chimney breast vents & plastering.
- Chimney breast possible moisture build-up issue addressed by filling flues with Leca (fired clay beads with some insulating property) up to loft floor level, opening bricks in loft chimney breast to allow ventilation of the top of the chimney stack, placing chimney caps on each cowl to prevent rain entering, & painting external stack brickwork with Keim mineral paint (Lotexan) to reduce driven rain ingress to bricks.
- Roof insulation in both main loft & bathroom loft topped up to minimum 300mm mineral wool. Airtight insulated loft access hatches installed in both.
- Solid floor insulation using 20mm polyurethane boards (Marmox) laid in adhesive, covered by underlay & laminate flooring.
- Mechanical Ventilation with Heat Recovery unit installed in bathroom (Brink Sky300) with ducts running to manifolds and then to supply & exhaust terminals. Fans of unit are self-balancing and flows to rooms achieved by using restrictors at the manifold to duct junctions (according to calculator programme).
- Condensing boiler (Remeha Avanta Exclusive) & thermostat. Pipework in bathroom loft lagged.
- Thermal bridging calcs done. Problem junctions were party wall to loft, party wall to external wall (in vertical plane), & party wall to solid floor. Addressed using strips of Spacetherm-P that were fixed to the wall and/or ceiling part of the junction – in this case, Spacetherm was 10mm fixed to 9.5mm plasterboard.
- Water saving toilet installed.
- Energy-efficient lights installed.
monitoring Baseline before improvements (assuming house heated to 20 degrees): Space heating demand 258.9 kWh/m2/year, Carbon emissions 91.7 kg/m2/year. Airtightness 17.45 ach (Passive House methodology).
After improvements: space heating demand 89.9 kWh/m2/year, Carbon emissions 37.6 kg/m2/year, representing a 65% and 59% reduction respectively compared to baseline situation. Airtightness 1.63 ach (Passive House methodology).
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