Impruneta's Marl

It is a resistant and high quality soil, a unique natural product used since the ancient Etruscans, that prospers in its architectural use during the Renaissance: just think of Florence Cathedral dome by Brunelleschi, made ​​with tiles Impruneta terracotta.
The chemical composition of marl makes it a material extremely resistant to frost (up to temperatures approaching -30 ° C), making it ideal for outside spaces and coatings in continental climate countries, with high temperature ranges.