Standard Floor Joist Size
The right spacing depends on the code requirements as well as.
Standard floor joist size. Live load is weight of furniture wind snow and more. Designing with floor joist span tables part 2 of residential structural design. The span is the inside dimension from the support on one end to the support on the opposite end. In joist sizes the larger size such as 6 inches represents the height of the joists while the 2 inch size represents the joist width or the area on which the floorboards sit.
The following table gives details of allowable spans and spacing between joists for the most common timber sizes used in floor construction. Timber joists are available from us in numerous sizes. Dead load weight of structure and fixed loads 10 lbsft 2. For any other.
The next factor to consider is the joist spacing that will be used and the amount of weight the flooring will need to support. When determining the floor joist size measure the length of the span. There are three basic measurements used for floor joist spacing. Below is a table giving the minimum size floor joists needed for 16 and 24 on center oc spacing when using 2 lumber with 10 pounds per square foot of dead load and 40 pounds of live load.
For upper floors with a 22mm thick chipboard decking and 125mm plasterboard ceiling a dead load of between 025knm 2 and 05knm 2 may be assumed. The section sizes of the floor joists given in tables 1 and 2 should be regularised or be als or cls to enable floors and ceilings to be level. Properly spacing floor joists when framing an addition or whole structure is largely a factor of building codes. See our drop down menu for the full list of sizes.
For example a standard outdoor deck will not be required to support as much weight as a dining room floor unless the deck with have a large hot tub. Maximum floor joist span for no. The content on this page will explain how to interpret the results from the calculator. At the bottom of this page youll find a joist span calculator.
On this page we will explain how to design with floor joist span tables. There are also several floor joist sizes and types used. Two by 6 inches is a joist size frequently used in both indoor floors and as deck joists. Sawn and treated timber is one of the oldest and most widely used building materials used in the world today both within new build construction a.
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