Part L1 (2002) in existing dwellings – Case studies

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Results of 10 case studies carried out by BRE for the ODPM.

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BRE has just completed a project on behalf of the Office of the Deputy Prime Minister, Building Regulations Division on how the new requirements of the 2002 revisions of Part L1 – conservation of fuel and power – are being implemented in refurbishment projects.

Ten case studies have been developed and were presented at regional seminars in Autumn 2004.

The case studies are listed below and can be downloaded as Acrobat PDF files:

Victorian terraced houses in Reading
with internal and external polystyrene insulation; solar water heating and combi- boilers; some glass-fibre floor insulation; mineral wool roof insulation; wood framed double glazed windows; sun spaces.

Semi-detached houses in Bedford
with polystyrene external wall insulation and low-emissivity double glazing.

Insulation solutions in Cornwall
with phenolic foam external wall insulation and condensing boilers.

No-fines’ houses in Harrogate
with mineral fibre board external insulation; mineral wool loft insulation; and gas condensing boilers.

Nottingham ‘Eco-home’
a very high grade (but not as cost-effective) renovation – with phenolic foam internal and polystyrene external wall insulation; cellulose roof insulation; sheep wool floor insulation; wood-burning boiler; double and triple glazed windows with inert gas fill and low emissivity coatings; low energy spotlighting; air-tightness measures.

Renovation of flats in Wandsworth
with extruded polystyrene insulation on external framework; foam board roof insulation; low emissivity double glazing; heat recovery ventilation; new heating controls; sunspaces.

Period properties in Bedford
with expanded polystyrene internal insulation; mineral wool loft insulation; low emissivity sash windows with trickle ventilators; condensing boiler; new heating controls; humidity-controlled extract fans in wet rooms.

Ground source heat pumps
description of technical issues and procurement issues; suitability of properties (heat demand, airtightness); control strategies; cost benefits.

Combined heat and power in Portsmouth
gas CHP unit; use and effectiveness; cost benefits.

Converted factory in Hereford
change of use; polyurethane internal insulation; mineral wool or phenolic foam roof insulation; floor insulation; low emissivity double glazing or secondary glazing; condensing boilers; planning restrictions.


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