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.
About Solar Shingles. SolarShingle is a roof shingle with function of converting the sunshine to electrical power. It consists of a substrate and an opto-function layer. The substrate is made from galvanized steel. And, the opto-function layer on the surface of substrate to convert sun light into electricity, which is the difference between a SolarShingle and a traditional shingle.