E n e r g y R e c o v e r y o f ‘ 7 0 e s I n d u s t r i a l i z e d B u i l d i n g
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Finally, as it concers with the roofs, in order to obtain the energy performance required
by current legislation, it is provided the dismantling of Portuguese tiles and the setting of
insulating undertile panels, 6 cm thickness, and then the resetting of the mantle.
Such interventions do not solve, however, the problems of thermal bridges which are
common in this type of construction and not even considered at the time of the
construction by the Gescal legislation, prescribing transmittance values for the various
elements of the envelope. These problems could be solved only by means an outer
coating, altering the architectural appearance of buildings characterized by fair faced
brick walls, divided vertically and horizontally by reinforced concrete walls and slabs.
Moreover, possible interventions for the elimination of thermal bridges would be not
much effective in temperate climates.
As it concerns with transparent enclosures (casings), specific calculations were not
carried out due to the observed heterogeneity. In fact most galvanized steel monobloc
casings with single glazing are the original ones, causing high dispersions, and other
casings, replaced by users made of aluminum and double glazing, provide better
insulation. The proposed intervention is based on the replacement of all the casings,
even to unify the architectural aspect, with others allowing energy savings in compliance
with the current legislation.
The proposed technical solutions can be applied, taking into account the several
environmental parameters, to constructed buildings with the same technology in other
local, national and international contexts, arising significant energy savings both in winter
and in summer (2.4 W/m
2
K).
