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.
On has the metal expands and contracts due to weather changes, the metal will actually move. Over time if there wasnât a buffer in between, the shingle granules would wear away at the back of the metal roofing panels. The second way to install a metal roof over a shingle roof is with the use of purlins or battens.The purlins are screwed or nailed down to the roof deck, depending on how the metal roofing manufacture has testing for their roofing panels, and then the metal is installed to the purlins.This method has its benefits as well.he purlins are screwed or nailed down to the roof deck, depending on how the metal roofing manufacture has testing for their roofing panels, and then the metal is installed to the purlins. This method has its benefits as well.