Calantha Flooring August 16th, 2017 - 21:13:25
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.
If your price-point is not even in the same zip code, maybe it is in a different state, start shopping other options. For example if you are in the $1-2/sf range look at the deep discounters or laminate options. The FSC certified 12mm exterior birch plywood that we use to manufacturer the engineered flooring costs us that much alone, not counting all the other labor and materials.
Of all, the most commonly installed flooring system are framed floors. They consist of dimensioned lumber, bearing on exterior and interior load bearing walls or beams called "floor joists". Generally the floor joists are installed, spaced 16" apart. Installing rim and trimmer joists, to which the floor joists are nailed, finishes the perimeter. Bracing, usually in the form of bridging, but often installed as strapping, prevents the joists from turning in place. One other method used to prevent this type of turning is to glue the sub-flooring to the joists, as the sub-floor is placed.
The third variable is installation costs. Our engineered product has labor savings over our solid wood product because it is pre-sanded and milled to tighter tolerances. It is also prefilled in the holes and has next to zero waste. On the other hand you may have a little more in cost of gluing it down in addition to nails, but this is just a step in direction of better quality and peace of mind during the install.