The stone: it is a natural material, and what makes it more sustainable is its duration. In the northern
areas, the use of granite walls and slate roofs is widespread, due to the abundance of this material in the
Ceramic: both tile and brick, are economical, recyclable, renewable and low polluting materials. In Spain,
many clay areas have the use of ceramics as a tradition.
The Concrete: 100% of the buildings have concrete, it is a necessary material in the world of
construction. It is not ecological, but it is not very harmful to the environment, although it would be
required to look for concretes that have a lower impact.
Metal: Because of the high energy consumption it has in its production, they are not very sustainable,
but it is true that it has a long life, and some are recyclable like aluminum.
Wood: Wood meets all the requirements to be a biological material, does not pollute in any phase, is
renewable, and is recyclable. Most forests that are usually used in construction are tropical because
they better withstand temperature changes.
The plastic: these are the last in the sustainable chain. There are very polluting ones like PVC, the
pollutants are the ones that carry chlorine, and the sustainable ones are the recyclables. But since they
all come from oil they are non-renewable.