Clothing factory in Sri Lanka - Holcim Lanka Ltd

The massing of the building volumes and the positioning and sizing of
windows permit daylight to enter as natural illumination without causing
substantial heat gain. Horizontal shading intercepts the northern sun at
midyear and the southern sun later in the year.
Thermal roof load, the largest contributor to heat gain and indoor
discomfort in the tropics, is controlled by a combination of green roofs,
photovoltaic roofs, and cool roofs. Green roofs cover 1,757 square meters
of the building. They are installed on concrete decks over shortspan spaces
such as the offices. Covered with turf and plants, the high thermal mass
of this roof absorbs heat without transmitting it into the building. The
cool roof is a lightweight metal roof assembly over the longspan production
halls. The white metal, with a solar reflectivity index of 79, reflects
four fifths of the solar energy that reaches the roof. The photovoltaic roof
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