Joist Span – Using Engineered I Joits vs Conventional Joists
So from the start we were clear to our designer what we wanted to achieve so he created support for the upper engineered I joist by using room wall separations that were supporting and the joist span was taken into consideration as well. The downside….once the wall separations were made they were there to support the upper floor, you just could not move them a few years later without a lot of consideration and the addition of beams.
The house was big enough that this would not be a concern. Upon the completion of the plans, the floor plan copy went to our local lumber yard that in turn came up with a price for the engineered I joists and a span diagram that was to be followed to the letter by the rough crew on site. Here is a copy of the plan that you can take a look at. This part is not a DIY project. You can contact other firms that specialise in beams and trusses, they all have specialise software that calculates the spans and therefore the specifications for every joist.
Engineered I joists offer several advantages vs. traditional joists. These engineered floor joists can be purchased in varying depths with different sized flanges at the top and bottom. These engineered I joists install as a traditional wood floor joist would be installed and make for a stiffer, squeak less floor if properly installed with glue and nails. As well these engineered joists have cut-out or knock-out sections in the OSB material that can be removed to run electrical wires and/or heat ducts.
Engineered Wood I-beams have many advantages. They are straighter then conventional lumber, stronger than conventional lumber and if that is not enough stiffer. The technical information on these engineered forms indicates that they are 50% stiffer than conventional lumber. Ultimately you get a better floor construction.
Do to their strength, these I joists can span over longer openings, and be installed over wider on centre spacing. A reduction in building cost is achieved despite the increased cost per beam due to less beams being required, faster installation, and the elimination of several support beams.
Added to these benefits are the fact that these engineered I joist are 60% lighter than conventional wood as they are constructed with OSB material and finger jointed sawn lumber. This type of construction produce I joist that do not warp, shrink, twist or cup, therefore providing stiffer floors that have less a tenancy to squeak or settle.
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