At Specialty Barns we use solid pressure treated 2x4s and 4x4s for the frame and legs. Flooring is 1” hard pine boards. Walls are studded with 2x3s. Gussets are added to the four corners and legs for support. Rafter material is 2x3s. The exterior walls are pine tongue and groove boards.
The roof is built with roofing board. Covered by a layer of tar paper. A drip edge is secured to the bottom edge of roof. Top quality shingles used to prevent rain and snow from entering the building. All coops, animal houses, etc. are assembled with galvanized nails and screws. Windows are built using real glass.