There are three main types of sub-flooring installed to cover and span the floor structure. It is over this that the finished floor will be placed. The sub-flooring types include raw sheathing, interlocking and strip. It is utilized not only to provide a surface for the interior finishes to be placed on, but also to prevent twisting or torque forces placed on the building. The sub-floor also allows load sharing within the joist framing system. Often the sub-flooring is glued to the joist work to eliminate creaking floors and to prevent the floor joists from turning.
Traditional tile installation requires many tools and lots of patience which have to be pre-set on the floor, cut down to size, then adhered to the floor using a strong industrial glue. They will not stick to every surface and frequently, a layer of floor base must be installed before the tiling work can begin. If the tiles are placed too close together, they can buckle, leaving unsightly bumps and lumps on the floor. If they are placed too far apart, there will be obvious gaps. If a mistake is made when laying down the tile, it is very difficult to fix as the tile is glued to the floor. The tile will have to be pried up, excess adhesive scraped, and the process started over. Laying traditional tile floors is a project that can take several days, to several weeks, to finish.
All joists must extend at least 1-1/2" on to a bearing assembly, of either a beam or full height wall, unless metal hangers are installed to provide proper bearing support against other structural components. Beams, which support the floor joists over greater spans, are constructed in the form of laminated joists often referred to as built up beams, or one piece solid load bearing beams, cut from logs or manufactured. Electricians and plumber may often cut or drill into the joist work to install utilities, and this is accepted, so long as they do not remove more material than what is required by codes. This type of floor system is usually the cheapest to install.
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