Nynette Flooring July 19th, 2017 - 19:25:48
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.
Laying the floor is also another area that is worth thinking about when comparing the two types of oak flooring. The majority of engineered wood floors are longer and wider than most solid oak boards because this is the look that most people are wanting nowadays. The flooring being longer and wider means the flooring is quicker to fit. Another aspect that makes this floor easier and quicker to fit is how well machined the boards are. From our experience in the flooring industry we have had nothing but good feedback regarding how easy our engineered flooring was to lay, and this is down to how well machined the boards are. Given that engineered flooring is quicker and easier to fit, any extra money that is spent on purchasing an engineered oak floor is often compensated in the time that is saved fitting it! This is something to keep in mind when comparing prices.
The manufactured joist, which is a relatively new product, is often manufactured from low cost materials in the shape of an I beam, similar to steel beams in larger buildings. What this means is that the joist is constructed with a thicker top and bottom edge, and generally interlocking aspenite vertically spanning between the two. These systems are very strong, often capable of spanning the entire width of the building.
In the case of long span truss work, bearing lengths of at least 3" are quite common. Trusses span greater distances than framed floor assemblies and can be designed to span the entire building, eliminating center load bearing supports. They are moderately more expensive than framed floor assemblies, but provide a remarkably strong floor with little deflection or "bounce" to it. Another advantage to this type of structural system, is that utility installations can be run between the webwork components. Never allow trades to cut or drill into the members of a truss, for they are manufactured precisely for the loading conditions they will undergo during the life of the building.