Nanine Flooring August 06th, 2017 - 17:01:52
Truss floors are simply that. They are constructed from small dimensioned lumber, interconnected in a webwork pattern by the use of metal or wood plates. Occasionally, the trusses will be built on site, utilizing plywood plates to connect the webwork together. Generally they are installed 24" apart, either suspended on bearing walls or beams, or installed with plywood trim or rim joists around the perimeter. Strapping is installed on the bottom side, to prevent turning in place, which is a common ailment for deep truss components.
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.
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.
Did you see a picture that you like and now you have the bug that you want that special floor? The good news is that it could probably be made for you, but before you go a long ways down the path of choosing which floor you want and requesting a display room full of samples, ask about some price ranges. There is a common misconception that since reclaimed wood is supposedly salvaged it should be cheaper than virgin wood floors. If you are buying a quality kiln dried and precision milled product, generally that is not the case. The only cost savings would be if you found some scraps or did some salvage work yourself, you might save some costs. For example you might find a gym floor or planks out of a barn hay loft that you want to nail down on your floor. The material might have been next to free, but how much time are you going to have in making it usable and pulling nails? Are the results what you want?