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.
Metal roofing materials can be created in large sheets, or in individual shingles or panels designed to simulate the look of a roof of asphalt shingle, clay tile, stone tile, slate or wood. A metal roof is lightweight, durable, fire-resistant and does not rot.