Shed roofs are also used over some porches. Only the bottom sash moves up and down, the top is fixed. For a slab foundation, the site is leveled off, and a trench is dug around the perimeter of the home site. Gravel is then spread across the site, and concrete is poured approximately four inches thick over wire mesh and a moisture barrier. In areas of load bearing walls, trenches need to be dug to allow for additional thickness at this location.
Slab foundations have no piers or floor joists, and the concrete slab is the floor system.
Sliders Windows that slide open, like sliding glass doors. The underside of the roof overhang or porch ceiling that covers the rafter bottoms. This horizontal surface usually has vents to allow air into the attic. These are just like they sound, they run straight up to the second floor. These homes usually do not have porches, but several will have covered entryways.