intervention strategies for renovation of social housing estates

Directed to ENERGY EFFICIENCY
36
Double glazed facade with large air cavity
containing shared spaces
37
Add further insulation to existing facade
Depending on the technical characteristics of the Improvement of sound and thermal insulation;
glazing it leads to the improvement of the performances Insulation from outside leads to relevant energy savings
of existing facade;
and solve thermal bridges;
Combined with mechanical ventilation within the air Insulating from outside do not subtract floor space
cavity, improves total energy consumption;
within the dwelling;
Using ETICS (Thermal Insulation Composite System)
life span of the facade could be extended of 1-2
decades;
Using ETICS deterioration do not need to be
threatened;
Local regulation (in Italy size and number of rooms of Critical deterioration of the envelope;
social dwellings are subjected to restrictions provided Condensation could be caused by high difference in
by law);
temperature between inside and outside
Local regulation with respect to its integration with the
surroundings;
High risk for a decrease of the inner comfort in summer
due to overheating;
When it is used mechanical system for air ventilation in
the cavity, there might be noise due to air circulation;
Health consequences need to be considered (like, for
example, air flows and depuration regarding the
ventilation system, the selection of safe materials)
Structural capacity of the block if the double facade is
hanged to the building (in many Italian residential
blocks, like Laurentino 38, tenants made inner
changes. Alterations they made, like moving of walls
and/or big openings, have to be calculated to design the
new facade);
**
Break of repetitiveness. Transformation of
massiveness and silhouette;
Better appearance of air cavity if using materials that
remind good quality housing (no cheap materials like
masonry or plastic)
Limited to one side of the building;
Repetition of the same solution (like shape and
material) could replicate initial problems (like a plain
façade);
Short lasting materials shorten 'wow effect' of
renovation
Address societal concerns;
Reduces noise annoyance;
Improves residential satisfaction
Leads to a substantial improvement of the dwellings'
quality;
No special expertise is required;
Improvement of housing quality without moving the
walls;
Tenants can stay their dwellings during the works;
Relevant transformation of appearance could be used
as a window sponsoring the restructuring of the area;
Could be used as a selling point
**
When added from the outside:
changes the appearance of exteriors and improves
appearance if using materials that remind good quality
housing (no cheap materials like masonry or plastic);
break of repetitiveness especially when colors and
textures are changed;
improve the appearance if using materials that remind
good quality housing (no cheap materials like masonry
Clearly, no improvement of appearance when thermal
insulation is added from inside. But there is a decrease
of inner surface of the dwelling
Address societal concerns;
Reduces noise annoyance;
Improves residential satisfaction;
Leaves money for living saved from lower energy bills
38
Change windows frames and glazing of existing
facade
Improvement of sound and thermal insulation, and
ventialtion;
Contribution to energy savings
Critical deterioration of the envelope;
Condensation could be caused by high difference in
temperature between inside and outside
*
Better appearance if using materials that remind good
quality housing (no cheap materials like masonry or
plastic);
Window system can be changed preserving the
appearance;
Short lasting materials shorten 'wow effect' of
renovation
Address social control;
Reduces noise annoyance and improves residential
satisfaction
Leads to a substantial improvement of the dwelling's Quick improvement of housing quality;
quality - inner comfort;
No special expertise is required;
Special expertise is required to prevent any moisture
and health problem;
Improvement of housing quality without moving the
walls;
Renovation works could be very quick. Thus, if
additional insulation form inside, move of tenants could
be managed more easily and causing less expenses;
If additional insulation form outside tenants can stay
their dwellings during the works.
Need for an ad-hoc regulation to manage the
Savings on energy costs do not constitute a financial
transformation;
return for the housing association but only for tenants;
Need of technical expertise;
Energy savings for renovation of existing social housing
Relevant transformation of the appearance could be estates is not compulsory, but it will be in the next future
subjected to the approach undertaken by the housing
association;
Energy savings for renovation of existing social housing
estates is not compulsory, but it will be in the next
future;
'Sustainable renovation' is an investment on the long
run;
RECYCLING INSTALLATIONS
39
Use of the existing casco
This is not a single measure rather an approach to
sustainable renovation. By means of reusing of casco
structure almost everything is possible with respect to
physical quality and energy efficiency.
By preserving the bearing structure the whole facade
can be entirely substituted.
The highest housing differentiation can be obtained by
moving existing walls, making openings into the floors
and extending the facade;
Structural capacity of the block (in many Italian
residential blocks, like Laurentino 38, tenants made
inner changes. Alterations they made, like moving of
walls and/or big openings, have to be calculated to
design the new facade);
It is technically more difficult and limited in flexibility of
solutions where it was used the tunnel technology (see
restrictions in measures from 1 to 20. Clearly, this is
true also in the case of Laurentino 38);
In choosing a new envelope, also health need to be
considered (in terms, for example, of ventilation system
and safety materials).
***
Highest transformation potential of entire block
40
Add solar panels or PV
(on roof and/or top-end facade)
Add them on top-floor or top-end facade is the easiest
and most diffused solution. However, there is a wider
range of alternative measures that worth be considered
(like heat pumps, heat power, central systems and
biogas).
Could be used as a shading system;
Could substitute existing parapets;
Could function as a cladding improving thermal
insulation of the facade
**
If integrated in the architecture design
Integration with buildings nearby No improvement of appearance when simply placed
where space available
A label (plate) attached outside the dwelling showing Addresses societal concerns, people value visible
new energy consumptions could make tenants more measures
aware of energy issues and solicitude energy based
behaviors. However, this measure alone does not work
in practice. Combination with other initiatives is
required.
High potential for changing market position of dwellings;
Effective energy consumptions could serve as a selling
point;
Can be a good alternative to demolition (in terms of
financial returns on the long term and energy efficiency,
and when demolition is obstacle due to the location).
However, it requires substantial investments;
Waste of (selective) demolition could be reused for new
construction in the neighborhood (see Germany);
Dutch law provides that demolition waste has to be
reused - mostly for roads and concrete contraction
works;
Depending on the characteristics of the new envelope
the process can be a very quick (even just two weeks);
Recycling of waste obtained from the works (also
facade and windows) is technically feasible;
Need for an ad-hoc regulation to manage the
Need of technical expertise;
transformation;
Savings on energy costs do not constitute a financial
Selective demolition is necessary for which special return for the housing association but only for tenants;
expertize is required. In the case of Italy, the lack of Energy savings for renovation of existing social housing
experience could be a limitation (this is particulalry true estates is not compulsory, but it will be in the next
in the case of neighbourhoods like Laurentino 38 future;
where it has been used the tunnel technology);
Tenants should move another place during the works,
that means expences for grants and temporary
accommodations;
In the Netherlands, far less than 50% of tenants return
their dwellings that could lead to letting problems and
vacancy after renovation;
Need of technical expertise;
Implies substancial initial investments with financial
returns are on the long term;
If the commercial value of the site is high and there are
no special restrictions for the location, it is possible the
housing association will decide for demolition. However,
the existing social structure can have a lot of influence;
PHYSICAL ASPECTS (technical-functional)
APPEARANCE
SOCIAL ASPECTS
FEASIBILITY
S
W
S
W
S
W
S
W