The table excerpt above is simply a sample and may not be valid for your region. The table below shows the maximum span for a floor joist with the following designations: The house will have a gable roof and will be framed with wood studs. Let's start with a simple, very small house 12 feet wide by 13 feet long. Now we'll look at how to read these tables. These designations and numbers will become important when you are reading your structural tables since the strength of a wood depends on its designations. Common lumber grade designations include: The stamp shown above indicates the lumber grade is standard or better (STAND & BTR) this is the same as number 3 or stud. Species (red cedar, certain pines, balsam and poplars) The stamp above indicates in the triangle that the wood is Douglas Fir (D FIR). The mill identificationindicated by name or mill number.How the wood was seasoned - this will give an indication of the moisture content. The wood association of which the lumber manufacturer is a member.The wood grade - could be a number or description.The information displayed varies between wood associations. The stamp displays several types of information. In general, all lumber is stamped near the end of the lumber piece by the manufacturer. You will however, need to become familiar with reading your local floor joist span tables for floor beams, floor joists, window and door lintels, ceiling joists, roof joists, roof rafters, and roof ridge beams, as well as the sizing and spacing of wood studs tables.īefore jumping into the span tables, let's first consider wood species and wood grades. Continuing on from Part 1: Residential Structural Design Vertical Structural Forces, we were about to start learning about floor joist span tables.ĭon't worry, you won't need to do a lot of calculations in determining the size and placement of the structural framing within your house design.
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