This image shows the typical rookie mistake of spreading the detail when building a subdiv mesh. As you can see, the solution is to move the pentagon to the center topology. In this way we get a clean mesh uniform, with little tension and a perfect flow of edges that meet at a point (marked in white arrows that go their way). #subdivision
Tileable Triangle Inset Somebody was asking how to make this shape tileable as they could only make it with an unequal number of loops coming off opposite sides of the tile. This is how I would solve that problem.