Disadvantages of L shaped Stairs: 1  L shaped stairs are a bit more difficult to build. 2  A support is typically required for the landing in a L type stair. Often this is built into the surrounding walls so it goes unnoticed. 3  Handrails for these types of stairs require more skill and planning to construct. In climates where basements are used, stairs are typically stacked over each other for efficient use of space. Since basements are often used for storage, large items can be difficult to move in and out of the basement.
A valley roof is formed when two portions of the roof meet at an inside angle. These valleys are common to many roofs. The Cape Cod style of architecture is one type of home that is traditionally free of valleys if there are no dormer windows on the roof.
Hip and pyramid roofs: as the name suggests, a pyramid roof is a roof in the shape of a pyramid and is designed for a square building. A hip roof uses the same basic shape, but is elongated and is designed for a rectangular building. The hip roof is also very popular in North America. Gambrel roof: this is also known as the barn roof, as this style is often used on barns. This roof style maximizes the amount of usable space in the attic or top floor.