Patent ID: 7736557

Claim:
A method for decorating and installing a cementitious substrate, the method comprising: selecting a base color scheme for a plurality of substrates formed of a cementitious material; selecting an accent color scheme of colors distinct from the base color scheme; providing the plurality substrates, each having the base color scheme, a substrate width in a lateral direction, a length in a longitudinal direction orthogonal to the lateral direction, and a top surface, the top surface having an exposed portion and a covered portion; providing another cementitious material comprising water, pigment, cement, and aggregate proportioned to have substantially zero slump when applied on the top surface; applying before curing, by impact directed substantially exclusively toward and onto the exposed portion of the top surface of each substrate of the plurality of substrates, a distribution of globules of the other cementitious material deforming to form medallions as accents, colored in the accent color scheme, the distribution varying substantially randomly in lateral width along the longitudinal direction; the applying, further comprising forming the medallions in shape and height substantially exclusively by impact of the other cementitious material striking at least one of the top surface and other medallions previously formed on the top surface; curing each substrate and corresponding medallions simultaneously, leaving the medallions bonded onto the top surface and extending above the top surface a distance controlled by the impact and the proportion of water, cement, and aggregate; and installing the plurality of substrates, after curing as a roof covering with the exposed portions of some of the plurality of substrates overlapping the covered portions of others of the plurality of substrates.