Variegated building product and method

A method of injection molding a building product, comprising:

• (a) providing an injection mold with a first gate and a second gate, wherein each of the first and second gates is located adjacent a perimeter of the injection mold;
• (b) injecting a first material into the first gate;
• (c) injecting a second material into the second gate at about a same time as step (b), such that the first and second materials are substantially simultaneously co-injected into the injection mold, and the second material comprises a color that contrasts with a color of the first material;
• and
• (d) removing the molded building product from the injection mold;
• and the second material extends through an interior of the molded building product and appears as contrasting streaks on an exterior of the building product to form a variegated grain appearance;
• wherein the first material comprises a base resin, and further comprising a third material comprising a high melt streaker of a same polymer group as that of the base resin, and the third material melts at a higher temperature than that of the base resin.