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A 2×6 member for example cannot be used since it can only span 8-1″. Therefore given the above example, the minimum allowable joist size for douglas fir-larch #3 lumber spanning 10′-0″ is a 2×8 since it can span 10′-3″.
ONTARIO BUILDING CODE FLOOR JOIST SPAN TABLE HOW TO
Now with all that out of the way, lets take a look at those tables to learn how to correctly size floor joists using the prescriptive standards: If these loads are exceeded, the design is outside the prescriptive standards of the table and at that point the floor joists must be design in accordance with accepted engineering practice. As well as Table R502.3.1(2) can NOT be used for live loads that exceed 40 psf and dead loads that exceed 20 psf. It is important to note however that Table R502.3.1(1) can NOT be used for live loads that exceed 30 psf and dead loads that exceed 20 psf. Therefore if your installing floor joists serving a sleeping room, you must use Table R502.3.1(1) and for all other areas of a building other than a sleeping room, you must use Table R502.3.1(2). The code requires floor joists installed in residential sleeping areas to be designed with a live load of 30 pound per square foot (psf), which is what Table R502.3.1(1) is prescriptively designed for, while at the same time the code required floor joists installed in residential living areas to be designed with a live load of 40 pounds per square foot (psf), which is what Table R502.3.1(2) is prescriptively designed for. Now in order to select the correct table, we must understand which Live Load is to be use since the 2 tables vary based on the type of live load used.įor Residential Sleeping Areas we must use Table R502.3.1(1) and for Residential Living Areas we must use Table R502.3.1(2). Floor Joist Span TablesĪs mentioned above, the span tables within the code list the allowable floor joist spans for common lumber sizes based on what design load scenario is applied. Chapter 6 accounts for these loads but in this post we will just cover the gravity loads mentioned above as based on chapter 5 of the code.
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It is important to note that floor systems can also serve as a diaphragm to resist lateral loads from earthquakes and wind, however chapter 5 does not base the floor system requirements on these loads. The weight of the materials of construction incorporated into the building, including but not limited to walls, floors, roofs, ceilings, stairways, built-in partitions, finishes, cladding, and other similarly incorporated architectural and structural items, and fixed service equipment. This does not include construction or environmental loads.ĭead loads are defined by the code as follows: Loads produced by the use and occupancy of the building or other structure. Live loads are defined by the code as follows: The code recognizes 2 types of loads that are applied to floor joists: Live Loads and Dead Loads. Before we look at these tables, we need to make sure the correct design loads are determined prior to selecting the correct table. These span tables list allowable floor joist spans for common lumber sizes based on what design load scenario is applied. Wood floor joists are sized based on one of two tables found in the code. In this post we will learn how to correctly size a floor joist based on its span, spacing and species of wood used.įun Tip: To learn the difference between the International Residential Code (IRC) verses the International Building Code (IBC), be sure to check out this POST. Section R502 outlines the wood floor framing criteria which also includes prescriptive span tables. The design and construction of wood floor joists are found in Section R502 of the International Residential Code (IRC). In this post we will cover wood floor framing members.