intervention strategies for renovation of social housing estates

Approaches to renovation interventions in the Netherlands, proposals for Rome chapter 4
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The next table shows initial characteristics of the block and the three proposals for
renovation. All single solutions are listed per each approach, including the respective cost,
the shift of the U value and the total energy consumption.
Total
ACTION COSTS
(€)
Thermal solar panels (for
hot water) on top of each
box
4 Substitute existing
envelope with light
prefabricated panels highly
insulated
SHIFT U
value
(W/Km 2 K)
0,20
(av. glazing
+panels)
SHIFT
ENERGY
CONSUMPT
(kWh/m 2 a)
65 to 30
Class C to A
>30
Class A
IMPROVEMENTS
CURRENT - Prefabricated concrete
- 0,69 101 -
BLOCK panels
Class E
SOFT 1 Additional thermal
200.000 0,69 to 0,34 101to 90 ENERGY
insulation from inside
Class E to D CONSUMPTIONS
2 Additional thermal
460.000 1,69 to 0,70 90 to 58
insulation on the roof
Class D to C
Additional thermal
insulation on the ceiling of
the portico
2,44 to 0,39
3 Substitute existing glazing 260.000 1,4 58 to 48
Class C to B
Total 900.000 Class B
HIGH- 1 Additional thermal
- 1,69 to 0,34 - ENERGY
LEVEL insulation on the roof
CONSUMPTIONS;
Additional thermal
2,44 to 0,28
BUILDING
insulation on the ceiling of
the portico
RECOGNIZABILITY
2 Substitute existing
0,19 48 to 28
envelope with light
prefabricated panels highly
insulated
Class B to A
Total 1.100.000 28
Class A
1 Fill in with dwellings the
voids on the first and the
second floor (1.200m 2 REproject
-
0,19 101 to 88 ENERGY
Class D CONSUMPTIONS;
)
BUILDING
2 Fill in the porticoed ground
88 to 67 RECOGNIZABILITY;
floor with commercial
Class D to C HOUSING
facilities
TYPOLOGY
3 Add living space to the
1,1
67 to 65
building by attaching small
volumes (boxes) with good
glazing
Class C
4.2.3) CONCLUSIONS AND FURTHER DEVELOPMENTS
Comparing the three proposals it emerges that they are all satisfying form an energy savings
perspective. By means of different physical measures, they all achieve Class B or even A.
However, because of their profound approach, high-level and REproject-proposal lead the
best energy saving (Class A). But considerable investments, especially to implement the last
proposal, could bring a financial return on the long term. A substantial contribution might
derive form the use of renewable energy sources (solar) and new rates of both dwellings and
commercial activities.
REproject could lead to the improvement of tree factors: energy savings, building aesthetics
(appearance) and housing supply. However, all the proposals, that in practice represent
three physical approaches to renovation, could be an answer to different levels of
requirements. The soft-proposal, for example, is an effective strategy wherever initial
conditions of the block turned out to be satisfactory (in terms of functional quality and
housing differentiation).
28. D
CONCLUSIONS
FURTHER
DEVELOPMENTS