Flooring August 20th, 2017 - 19:45:16
Raw sheathing comes in 4`x8` sheets, most often installed as 3/4" thick plywood panels. This type of sheathing is adequate for spanning joist work spaced up to 24" apart. The sheathing is lain with the joints staggered in such a matter, that no two edge joints line up with adjoining sheets. It is very easy to install, requiring the least amount of labour. The sheets are fastened with either 1-1/2" flooring screws, or 2-1/2" nails, spaced about 8" apart. Although not required, it is a good idea to provide backers or supports under the joints, between sheets which run perpendicular to the framed floor assembly.
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.
Most popularly used in bathrooms, kitchens, laundry areas and entryways are vinyl sheet, or linoleum floorings. This type of flooring cones in a vast array of colors, textures and patterns, in sheet sizes of 12 foot widths with varying lengths, and made from a vinyl composite, covered with a surface coating. It is installed by applying covering over the sub-floor, usually mahogany or particle core sheets 4`x4` in size, to which the vinyl is glued to. It can also be installed directly onto concrete floors, in areas such as basements. Joining two sheets together is a standard practice when the room width exceeds 12`, or under doorways. Sheet vinyl is a good flooring in areas where water tends to accumulate, like around bathroom fixtures or at entry ways. It is fairly durable, and often maintenance free. Linoleum is one of the cheapest types of flooring to install.
One drawback is that this type of floor requires special hanger systems designed for the joists, to enable them to be hung from each other or against beams/bearing walls. Manufactured joists are becoming a popular flooring system, for they are relatively cheap, reduce labour time and provide adequate support. However, builders need to familiarize themselves with its installations, for poor installation can cause severe structural damage to the joists. A good example is a three point, center bearing joist, left with the top chord uncut, which can potentially fail or pull apart, over the center bearing point.