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| GAS CENTRAL HEATING | ELECTRIC STORAGE HEATING | ||||||||
| floor area | House with solid walls U-value 2.1 | House with solid walls U-value 2.1 | |||||||
| m² | kWh / yr | £ / yr | tonnes CO² / yr |
tonnes carbon / yr |
kWh / yr | £ / yr | tonnes CO² / yr |
tonnes carbon / yr |
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| MID-TERRACED 2 bed 3 bed * |
63 79 |
3,722 4,667 |
55.47 69.55 |
0.70 0.90 |
0.20 0.20 |
3,123 3,917 |
103.67 130.00 |
1.40 1.70 |
0.40 0.50 |
| END-TERRACED 2 bed 3 bed * |
63 79 |
6,402 8,028 |
95.41 119.65 |
1.20 1.50 |
0.30 0.40 |
5,405 6,778 |
179.40 224.97 |
2.40 3.00 |
0.60 0.80 |
| SEMI-DETACHED HOUSE 2 bed 3 bed * 4 bed |
77 89 102 |
7,258 8,389 9,614 |
108.17 126.03 143.29 |
1.40 1.60 - |
0.40 0.40 - |
6,200 7,167 8,213 |
205.80 237.88 272.62 |
2.70 3.20 - |
0.70 0.90 - |
| DETACHED HOUSE 2 bed 3 bed * 4 bed |
90 104 120 |
10,962 12,687 14,615 |
163.37 188.78 217.83 |
- 2.40 2.80 |
- 0.70 0.80 |
9,567 11,056 12,756 |
317.56 366.95 423.41 |
- 4.20 5.60 |
- 1.10 1.50 |
base case *
Electricity costs are based on late draft of the forthcoming SAP 2001, that is, 7.92 £/GJ off peak and 20.91 £/GJ on peak.
Assuming 10% on peak and 90% off peak consumption gives a weighted average of 9.22 £/GJ
Gas costs (also based on SAP 2001 figures) are 4.14 £/GJ
Gas conversion factor 0.19kg CO² / kWh
Electric conversion factor 0.44kg CO² / kWh
BRE 22nd November 2001
| LAYER | THICKNESS | CONDUCTIVITY | RESISTANCE | |||||||||
| Internal surface | n/a | n/a | standard | = 0.123 | ||||||||
| Plaster | 0.015 | 0.500 | 0.015 / 0.500 | = 0.03 | ||||||||
| Internal brick | 0.105 | 0.62 | 0.105 / 0.62 | = 0.169 | ||||||||
| Exposed brick | 0.105 | 0.84 | 0.105 / 0.84 | = 0.125 | ||||||||
| External surface | n/a | n/a | standard | = 0.055 | ||||||||
| TOTAL RESISTANCE | = 0.502 | |||||||||||
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With the addition of . . .
| 40mm new insulation plaster / render, u-value = 0.81 w/mk giving a 60% energy saving. | |
| 50mm new insulation plaster / render, u-value = 0.70 w/mk giving a 65% energy saving. | |
| 60mm new insulation plaster / render, u-value = 0.62 w/mk giving a 69% energy saving. |
The plaster / render has the added benefit of sound insulation qualities which will comply with the proposed amendments of Document E of the Building Regulations with initial test results showing a 3 decibel reduction as will be required.
Wallreform is 89% MORE thermally efficient than any standard render.
WHY use anything else?
HELP THE ENVIRONMENT as buildings account for 50% of CO² emissions.
| Glasswool. mat / fibre | 0.040 w/mk |
| Fibre insulation board | 0.055 w/mk |
| Mineral wool | 0.040 w/mk |
| E P S | 0.040 w/mk |
| Plaster | 0.500 w/mk |
| Render | 0.500 w/mk |
| Plasterboard | 0.160 w/mk |
| Woodwool slab | 0.100 w/mk |
| Concrete block (lightweight) | 0.190 w/mk |
| Urea formaldehyde foam | 0.040 w/mk |
| Wallreform confirmed by the B.B.A. | 0.055 w/mk |
Equal to 89% better than standard renders, equivalent to insulation boards and can be equal to cavity wall insulation.
Wallreform can be applied to 40mm thickness in a single coat. It has the benefit of overcoming the problems inherent with rigidboard insulation systems, being mechanically stronger and crack resistant.
Any structure can be coated and a brick finish can be recreated.
Product can be sprayed for larger contracts
The following case study illustrates the energy saving on a 3 bed roomed terraced / semi house with a solid wall.
Below are the calculations to determine how much heat loss is currently being exhibited.
| Fabric Heat Loss | |||||||
| Surface | U-Value | Area | Dt | Watts | |||
| Window | 5.60 | x | 9.00 | x | 17 | = | 856.80 |
| Door | 3.00 | x | 4.00 | x | 17 | = | 204.00 |
| Wall | 2.10 | x | 91.50 | x | 17 | = | 3266.55 |
| Roof | 3.00 | x | 42.00 | x | 17 | = | 2142.00 |
| Floor | 2.00 | x | 42.00 | x | 17 | = | 1428.00 |
| Total Fabric Heat Loss | = | 7897.35 | |||||
| Fabric Heat Loss | = | Pf | = | U | x | A | x | Dt | |
| heat energy lost / time | u-value | area | difference in internal external temperatures |
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| Ventilation Loss | ||||||||||||||||||||||||||||||||||
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| Ventilation Loss | = | Pv | = | Cv | x | n | x | v | x | Dt | |
| heat energy lost / time | volumetric capacity |
air change | volume | difference in internal external temperatures |
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| Heat Gains | ||||||
| South facing windows | = | 680 mj/m² | x | 4.5 | = | 3060 |
| North facing windows | = | 250 mj/m² | x | 4.5 | = | 1125 |
| 3 occupants inhabit the property | = | 1000 mj/m² | x | 3.0 | = | 3000 |
| Cooking by gas | = | 6500 | ||||
| Water heating | = | 2000 | ||||
| Electrical | = | 3000 | ||||
| Total Heat Gain | = | 1868.50 | ||||
| Total Heat Loss - Before Wallreform |
| = ( Fabric Heat Loss + Ventilation Loss ) - Heat Gains = ( 7897.35 + 2127.13 ) - 1868.50 = ( 10024.48W x (33 weeks x 7 days x 24 hours x 60 mins x 60 seconds) ) - 1868.50 ( heating assessment is carried out over 33 weeks, the seasonal standard period )
= ( 10024.48W x 19958400 ) - 1868.50 = 20007 - 1868.50 = 181.38 GJ at £4.26 GJ = £771.06 |
| Heating Requirements |
| 181 GJ heat requirement supplied by gas convector heating system with 67% overall efficiency. Fuel calorific value = 40.6 MJ / M³ as supplied by British Gas = 67 / 100 output energy require at 181 GJ = 181 * (100/67) = 270149 / 40.6 = 6653 kg required |
Heating assessment is carried out over 33 weeks, the seasonal standard period
When 50mm of insulation is applied to the walls a u-value of 0.70 w/mk is achieved.
| Total Heat Loss - After Wallreform | ||||||
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| Heating Requirements |
| 137 GJ heat requirement supplied by gas convector heating system with 67% overall efficiency. Fuel calorific value = 40.6 MJ / M³ as supplied by British Gas = 67 / 100 output energy require at 181 GJ = 137 * (100/67) = 204477 / 40.6 = 5036 kg required Fuel required before Wallreform = 6653 kg Fuel required after Wallreform = 5036 kg = 24% less fuel required |
Heating assessment is carried out over 33 weeks, the seasonal standard period
Wall-Reform for solid wall insulation, damp proofing and renovation.
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