walls and windows, for transition cambridge

8/3/2019 Walls and Windows, for Transition Cambridge

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Walls & Windows

Working towards a 40% house

Andy BrownCambridge Architectural Research

24th November 2011


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Solid Wall Insulation

Some basics

Solid Walls The Green Deal


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Working towards a 40% house

Reductions in CO2

emissions form housingessential

UK commitment to 60%reduction in by 2050

Tyndal Centre recommends90% reduction by 2030

75% of 2050 housing stockalready exists.

Average house emits 6tonnes CO2 per year.


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Typical House in 2011

Poorinsulation

Single

glazing

Solid brickwalls

Draughtydoors and

windows

Lights left on

Inefficientappliances

26,000 kWhof energy in

Uninformed owner

6 tonnesCO2 out

Ancient boiler


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40% House

super -thickinsulation

wood-burningstove

efficientappliances

double-glazing

LEDlights

solarpanels

condensingboiler

energyconsciousowner

everythingdraft-stripped

heat recoveryventilation

2.4tonnesCO2 out

10,400 kWh ofenergy in


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How will we get there

Better building

regulations and zerocarbon codes.

The worst pre-1995houses demolished(appx. 3 million).

All appliances,gradually replaced.

All houses built beforeupgraded (20 million).


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What can we do?

Good housekeeping.

Jobs for the weekend. Taking opportunities.

Big projects


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Taking Opportunities


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Taking Opportunities


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Ten Year PlanYear One

Change all light bulbs to low-energy ones.

Stop using tumble dryer

Sign up to Ecotricity for electricity supply.

Turn down boiler thermostat and turn down room thermostat to 18.Install temporary cling-film on the single-glazed window s.

Become rigorous about turning off all l ights and appliances when not in use

Review on/off t imes for central heating and hot w ater

Install a new high-performance front door.

Year Two

Put foil behind all external wall radiators and shelves over all radiators

Draught-strip remaining windows

Put additional jacket on hot w ater cylinder

Replace one single-glazed window with a double-glazed unit, dry lining the wall at the same time.Year Three

Replace another window, dry-lining the room as before

Replace fridge

Year Four

Re-fit 30 year old bathroom, including: solar water heating, heat recovery extract fan, new double-

glazed window and dry lining external wall

Year Five

Fit double-glazed window and dry line in last room with single glazing.

Years Five to Ten

Flat roof on extension will be due to be re-covered. Add 100 mm insulation and sedum cover roof. Installnatural ventilation extract system.

Lift ground floor boards and insulate below floor.

Install back boiler in wood stove to provide heat for bedroom radiators

Recover main slate roof w ith new recycled slates, adding 100 mm insulation above rafters

Pressure test house and initiate program to seal leaks.


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Solid Wall Insulation


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Insulating Solid Walls

Insulation

Installation Details

Costs and Savings

50% f it th h th


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50% of our energy exits through thewalls and windows


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Insulation is measured by the U-Value

0.00

0.50

1.00

1.50

2.00

2.50

Solid

walls

Cavitywalls

Insulat

edcavity

Improv

edbuildi

ngregulatio

ns

PasivHa

us

Construction U-Value Insulation

mm

Solid walls 2.00

1930's Cavity walls 1.001970's Insulated cavity 0.60 50

2000's Improved building regulations 0.25 100

2010's PasivHaus 0.12 250


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Materials


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Insulationeg. Celotex

Most efficient

Made from petrochemicals

Available as composite boards ( Kingspan)

More expensive

eg. Jablite, Styrofoam

Cheap

Cheapest

IrritantMineral wool (Rockwool) an alternat ive

eg. Warmcell

Environmentally friendly

Dubious performance in damp areas

eg. Sheep's wool - Thermafleece

Also flax, cotton waste and hemp.Expensive.

Expensive.

Thin

Uncertain performance

Natural fibres

Composite foils

Polyurethane/Polyisocyanurate

foam,

Expanded Polystyrene

Fibreglass batts.

Recycled paper


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Installation

External

Internal Glued to wall

Fixed betweenBattens


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External Insulation

Changes character of

house Requires special details

where cladding meets:

Roof

Ground

Windows and Doors


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Dry Lining


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Details

Other Works

Radiators and Electrical

Skirtings and covings

Decoration

Cold bridges

Floors and Partition walls

Window reveals

Vapour Control

Joints inboarding

Around pipes Electrical fittings

Floors andCeilings


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Risks

Planning

Listed buildings Conservation areas

Wildlife

Water

Condensation

Damp walls

Ventilation

Poor workmanship


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Savings

Costs

500 to 1,000 per room 500 to 1,000 per window

2% - 4% of floor space

Disruption and builders

Small risk of overheating

Benefits

Heating costs

Reduced CO2 emissions Warmer walls

Permanent solution


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Be careful what you wish for

Monetisation of

everyday life Information overload


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Autumn 2012

Loan of up to 20,000

Repayments limited tosavings on utility billsThe Golden Rule

Debt attached to the

dwelling

One stop shop


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Andy BrownCambridge Architectural Research

[email protected]

01223 460475


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walls and windows, for transition cambridge

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