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Shell



A house's shell consists of roofing, siding and windows. Roofing is an important part of a houses shell. Exterior walls are faced on the outside with some type of durable siding. Insulation provides an additional barrier to the movement of heat through a wall.

Roofing
Since roofs are the outer cover of a house it should be both durable and attractive. It should be leak proof and resist craking. Roof deck is made up of sheathing and roofing felt. Mostly solid plywood is used as deck. Roofing felt is placed between sheathing and surface material. This repels any water on the roofing material. Flashing helps in repelling water wherever roof surface is broken. It is made up of galvanizing steel.