Roofing material, and roof system including the roofing material

A system, comprising:

• a roof deck;
• a first roofing material installed on the roof deck;
• a second roofing material installed on the roof deck, adjacent to the first roofing material,
• wherein the second roofing material comprises:
• a first layer comprising silicone,
• a first substrate, and
• a first barrier layer,
• wherein the first layer covers a surface of the first substrate, and
• wherein the first substrate partially covers a surface of the first barrier layer, thereby to provide at least a first area of a surface of the first barrier layer not covered by the first substrate,
• wherein the first roofing material overlaps at least a portion of the first area;
• and
• a flashing material comprising silicone,
• wherein the flashing material covers at least a portion of each of
• the first roofing material, and
• the first layer of the second roofing material.