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What are the spots?carbon dioxide emissionsfuel costs They show the relative Cost Savings and Reduced CO2 emissions.

Money
Saving
Tips
 Energy 
Savings 
Each Year
 Money
Savings
Each Year
 CO2
Savings
Each Year
 Comments
dishwasher energy saving tips Dishwashers
Read More
30kWh -
90kWh
£4.62 -
£13.86

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11.01kg -
33.03kg
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Run the machine full and less often

boil less water in kettle energy saving tips Boiling Water
Read More
82kWh -
164kWh
£12.628 -
£25.256

circle
30.09kg -
60.19kg
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Boil only what you need. Savings depend on how much tea you drink!

fridge freezer energy saving tips Fridge Freezers
Read More
50kWh -
400kWh
£7.7 -
£61.6

circle
18.35kg -
146.8kg
circle

Fridge maintenance. Savings depend on size, age and rating

dmoney saving tips tumble drying Tumble Dryers
Read More
90kWh -
350kWh
£13.86 -
£53.9

circle
33.03kg -
128.45kg
circle

Operate Less often, clean filters, part dry clothes?

differnce in cost of shallow or deep bath Baths
Read More
700kWh -
1400kWh
£30.1 -
£215.6

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147kg -
513.8kg
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Have shallower baths and consider how you heat water

change energy supplier to save money Change Supplier
Read More
0kWh -
0kWh
£0 -
£500

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0 -
0
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save money and have a beerSwitch! This is the single simplest way of saving money. This is equivalent to 100 pints of beer!

shower or power shower which is cheaper Shower of Power Shower
Read More
120kWh -
1100kWh
£18.48 -
£242

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25.2kg -
403.7kg
circle

Aviod immersion heated power showers

save money and energy with good loft insulation Install Loft Insulation
Read More
3000kWh -
3750kWh
£129 -
£161.25

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630kg -
787.5kg
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Modern loft insulation in a 3 bed semi - these numbers are for Gas, savings are greater for other fuels

save money and energy with good loft insulation Improve Loft Insulation
Read More
1000kWh -
1500kWh
£43 -
£64.5

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210kg -
315kg
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Modern loft insulation in a 3 bed semi - these numbers are for Gas, savings are greater for other fuels

This table is under construction there are more tips here.

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Solid Wall Insulation

Last Updated on Saturday, 14 October 2017 14:34





Solid Wall Insulation
custom line

Solid Wall Insulation

If you have a very old house with solid walls then you are losing a lot of heat through the walls. Solid walls transmit heat at, at least twice the rate that uninsulated cavity walls do.

solid wall insulation investment
 Cost:  High
 ROI:  15.8 Years
 Skill:  Specialist
 Energy Saving:  High
 CO2e Saving:  High
 How much this measure costs to install: Low : Medium : High
 ROI is the time it takes to return the investment in fuel savings for an average gas heated 3 bed semi-detached house and assumes no government incentive schemes are used: Years
 How easy this is to do: DIY-Easy : DIY-Skilled : Specialist
 How much energy will be saved with this measure: Low : Medium : High
 How much Carbon Dioxide emission will be saved with this measure: Low : Medium : High

Throughout the heating and insulation section of this site an average house is used and assumes that the walls have cavities, such that a three bed house with no insulation measures, is approximated to use 20,000kWh per year and the 5 bed house is approximated to use 30,000kWh. With a solid wall house the starting point is higher about 20% higher. So for this section we will use the numbers 24,000kWh for the smaller house and 36,000kWh for the larger house for the calculations.

There are two types of insulation for solid walls, external and internal. They are both expensive and both have their pros and cons, the energy savings trust has a good list of these on their site, they seem only to consider the savings if you are gas heated however (we assume). The main problem with internal insulation is the disruption to the house and the fact that your rooms will end up being a bit smaller, if however you are planning to redecorate it may be an idea. With the external wall insulation the whole house is likely to alter in appearance, this may be an advantage to some!

With external solid wall insulation you can reduce your energy bill for heating by about 45%, and for internal solid wall insulation by about 40%. The first table calculates the approximate pay back times for external solid wall insulation and assumes an installation cost of £ 11,000 for the smaller house about £ 15,000 for the larger house. The second table calculates the approximate pay back times for internal solid wall insulation and assumes an installation cost of £ 7000 for the smaller house about £ 11,000 for the larger house

External Solid Wall Insulation


  Approx % energy saving Approx energy saving per year
Gas                      
Electric  (Std) Economy 7 LPG                      
Fuel   Oil        
3 bed house 45% 10800 kWh £ 464.4 £ 1663.2 £ 810 £ 626.4 £ 464.4
Payback time with external wall insulation costing £ 11,000 (3 bed house) 23.7 years 6.6 years 13.6 years 17.6 years 23.7 years
5 bed house 45% 16200 kWh £ 696.6 £ 2494.8 £ 1215 £ 939.6 £ 696.6
Payback time with external wall insulation costing £ 15000 (5 bed house) 21.5 years 6 years 12.3 years 16 years 21.5 years
Calculations assume the energy required to heat an un-insulated solid wall 3 bed house is 24000 kWh and a 5 bed house is 36000kWh.

Internal Solid Wall Insulation


  Approx % energy saving Approx energy saving per year
Gas                      
Electric  (Std) Economy 7 LPG                      
Fuel   Oil        
3 bed house 40% 9600 kWh £ 412.8 £ 1478.4 £ 720 £ 556.8 £ 412.8
Payback time with internal wall insulation costing £ 7,000 (3 bed house) 17 years 4.7 years 9.7 years 12.6 years 17 years
5 bed house 40% 14400 kWh £ 619.2 £ 2217.6 £ 1080 £ 835.2 £ 619.2
Payback time with internal wall insulation costing £ 11,000 (5 bed house) 15.8 years 4.4 years 9.1 years 11.7 years 15.8 years
Calculations assume the energy required to heat an un-insulated solid wall 3 bed house is 24000 kWh and a 5 bed house is 36000kWh.

Is it worth doing?

Of the various insulation measures outlined on this site, this is probably the least cost effective simply because of the costs of installing it. The external insulation is more expensive and will require professionals to do it, so there are unlikely to be ways to reduce costs. With the internal insulation a competent DIY'er may be able to do the job and as such reduce the payback time. With expensive heating fuels the measure becomes more sensible for example if you use LPG or heating oil. The measure does however represent and enormous energy saving and corresponding reduction in C02, if this is a concern to you, and remember fuel prices are only going up!

solid wall insulation investment
 Cost:  High
 ROI:  15.8 Years
 Skill:  Specialist
 Energy Saving:  High
 CO2e Saving:  High
 How much this measure costs to install: Low : Medium : High
 ROI is the time it takes to return the investment in fuel savings for an average gas heated 3 bed semi-detached house and assumes no government incentive schemes are used: Years
 How easy this is to do: DIY-Easy : DIY-Skilled : Specialist
 How much energy will be saved with this measure: Low : Medium : High
 How much Carbon Dioxide emission will be saved with this measure: Low : Medium : High

If you have a very old house with solid walls then you are losing a lot of heat through the walls. Solid walls transmit heat at, at least twice the rate that uninsulated cavity walls do. Throughout the heating and insulation section of this site an average house is used and assumes that the walls have cavities, such that a three bed house with no insulation measures, is approximated to use 20,000kWh per year and the 5 bed house is approximated to use 30,000kWh. With a solid wall house the starting point is higher about 20% higher. So for this section we will use the numbers 24,000kWh for the smaller house and 36,000kWh for the larger house for the calculations.


There are two types of insulation for solid walls, external and internal. They are both expensive and both have their pros and cons, the energy savings trust has a good list of these on their site, they seem only to consider the savings if you are gas heated however (we assume). The main problem with internal insulation is the disruption to the house and the fact that your rooms will end up being a bit smaller, if however you are planning to redecorate it may be an idea. With the external wall insulation the whole house is likely to alter in appearance, this may be an advantage to some!

With external solid wall insulation you can reduce your energy bill for heating by about 45%, and for internal solid wall insulation by about 40%. The first table calculates the approximate pay back times for external solid wall insulation and assumes an installation cost of £ 11,000 for the smaller house about £ 15,000 for the larger house. The second table calculates the approximate pay back times for internal solid wall insulation and assumes an installation cost of £ 7000 for the smaller house about £ 11,000 for the larger house

External Solid Wall Insulation


  Approx % energy saving Approx energy saving per year
Gas                      
Electric  (Std) Economy 7 LPG                      
Fuel   Oil        
3 bed house 45% 10800 kWh £ 464.4 £ 1663.2 £ 810 £ 626.4 £ 464.4
Payback time with external wall insulation costing £ 11,000 (3 bed house) 23.7 years 6.6 years 13.6 years 17.6 years 23.7 years
5 bed house 45% 16200 kWh £ 696.6 £ 2494.8 £ 1215 £ 939.6 £ 696.6
Payback time with external wall insulation costing £ 15000 (5 bed house) 21.5 years 6 years 12.3 years 16 years 21.5 years
Calculations assume the energy required to heat an un-insulated solid wall 3 bed house is 24000 kWh and a 5 bed house is 36000kWh.

Internal Solid Wall Insulation


  Approx % energy saving Approx energy saving per year
Gas                      
Electric  (Std) Economy 7 LPG                      
Fuel   Oil        
3 bed house 40% 9600 kWh £ 412.8 £ 1478.4 £ 720 £ 556.8 £ 412.8
Payback time with internal wall insulation costing £ 7,000 (3 bed house) 17 years 4.7 years 9.7 years 12.6 years 17 years
5 bed house 40% 14400 kWh £ 619.2 £ 2217.6 £ 1080 £ 835.2 £ 619.2
Payback time with internal wall insulation costing £ 11,000 (5 bed house) 15.8 years 4.4 years 9.1 years 11.7 years 15.8 years
Calculations assume the energy required to heat an un-insulated solid wall 3 bed house is 24000 kWh and a 5 bed house is 36000kWh.

Is it worth doing?

Of the various insulation measures outlined on this site, this is probably the least cost effective simply because of the costs of installing it. The external insulation is more expensive and will require professionals to do it, so there are unlikely to be ways to reduce costs. With the internal insulation a competent DIY'er may be able to do the job and as such reduce the payback time. With expensive heating fuels the measure becomes more sensible for example if you use LPG or heating oil. The measure does however represent and enormous energy saving and corresponding reduction in C02, if this is a concern to you, and remember fuel prices are only going up!

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