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typical wall layers data coming from the CTI report which classifies wall layers according to
Italian geographic areas, building age and constructive framework (Figure 3). The following
criteria have been applied: (i) the most spread construction typology in each island has been
considered; (ii) the building-age classification by ISTAT has been grouped according to the
CTI building-age classification; (iii) Tuscany sample in the CTI report has been considered
representative for Isola del Giglio; (iv) South Italy sample in the CTI report has been
considered representative for Sicilian Islands. It is worth noting that Census data are grouped
by Municipality and for this reason, being Lampedusa and Linosa a unique legal entity, have
been handled together as far as Favignana which encloses also the islands of Levanzo and
Marettimo.

A B

Figure 3. Building constructive frameworks (A) and ages (B)

As a result, two wall packages have been considered for each island, as shown in Figure 3.
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They are: plaster/tuff stone/plaster (U-Value=1.15 Wm K ) and plaster/clay brick/plaster
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(U-Value=0.57 Wm K ). Ground, ceiling and roof structures have been assumed to be made
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in reinforced-concrete in all cases (Uground=0.83 Wm K ; Uroof=1.23 Wm K , Uceiling=1.71
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Wm K ), while single-glass and aluminum frame without thermal break are supposed to be
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the only window typology (UW =5.1 Wm K ). It is worth noting that only in
Lampedusa/Linosa it was possible to define a unique model of buildings laying in the area of
interest, being them mainly of the same age and built in masonry structure. For the other
islands, different wall packages and building typologies have been considered.
Reference buildings geometry can be inferred by the ISTAT database. For each island, it was
possible to identify the percentage of buildings with different number of floors and the
average number of apartments per building as the ratio between the total number of
apartments (Na) and the total number of buildings (Nb). Three different reference buildings
have been defined according to the number of floors (A, B and C in Figure 4). It is worth to
note that a certain correspondence between the highest percentage of buildings with a defined
number of floors and the average number of apartment occurs. It is then reasonable to suppose
that the reference building has one apartment per floor. Building simulations have been
performed assuming, in each building, one thermal zone per floor. Furthermore, the reference
buildings are supposed to be square-shaped and grouped in squared or aligned blocks
(respectively scheme 1 and 2 in Figure 4). Indeed, each island shows a peculiar urban
structure and block schemes according also to the prevailing orientation of buildings and their
boundary conditions. It must be noted that the other geometrical features have been desumed
by the Italian building rules (minimum ceiling height: 2.7 m and minimum window area/floor
area ratio Aw =Sres/8).

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