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What size do floor joists need to be?

Typical Floor Joist Size In Residential Construction Floor joists range from 2×8 to 2×12. It is less common to see joists that are 2×6, even though they are included in joist span tables. Older homes are more likely to use 2×6 for joist framing.

What size do floor joists need to be UK?

Joists are to have minimum end bearing of 40mm. The floor joist span tables are based on the loadings given in the amended version of BS 6399-1 which is an imposed load of either a uniformly distributed load of 1.5 kN/m² or a concentrated load of 1.4 kN.

What size are floor joists in residential construction?

The joists can be longer or shorter as required by space and size, and are typically spaced at either 450mm or 600mm apart. The thickness of flooring joists themselves will be determined by what’s going on top of them. Joists that sit below end matched joints must be at least 35mm thick.

What is code for floor joist?

Per the prescriptive tables found in Chapter 5 of the International Residential Code (IRC), the standard floor joist spacing used is 12, 16, 19.2, and 24 inches on center.

Can I use 2×8 for floor joist?

From what you said in your posts, that would mean the room with the 2 x 8 floor joists has a joist span of 12′. The room is 24′ long and 12′ wide with a steel beam running down the middle of the width which halves the 24′ span to 12′. 2 x 8’s are maximum spanned at 12′ long spaced 16″ oc.

What size floor joist do I need for a 16 foot span?

Max. Live Load 60 lbs/ft2 (2873 N/m2)

Maximum Span (ft – in)
Nominal Size (inches) Joist Spacing Center to Center (inches) Lumber Grade
2 x 12 24 12′ – 4″
2 x 14 12 19′ – 5″
16 16′ – 10″

Can I use 2×8 for floor joists?

Span is determined by species, grade, dimensions, spacing, use, and load. A rule of thumb is 1.5 times a joist’s depth but in feet when spaced at 16” centers. In general, a 2×8 will span 1.5 x 8, so 12-feet. Based on all factors though, a 2×8 joist span is 7′-1” to 16′-6”, and a rafter 6′-7” and 23′-9”.

Will a 2×8 span 12?

In general terms, joists spaced 16 inches on center can span 1.5 times in feet their depth in inches. A 2×8 up to 12 feet; 2×10 to 15 feet and 2×12 to 18 feet.

What’s the standard spacing for a floor joist?

Per the prescriptive tables found in Chapter 5 of the International Residential Code (IRC), the standard floor joist spacing used is 12, 16, 19.2, and 24 inches on center. How far can a floor joist span? The maximum span of a floor joist is based on the size, spacing and species of wood used along with the design loads applied to the floor joist.

Where do you find wood floor joists in IRC?

The design and construction of wood floor joists are found in Section R502 of the International Residential Code (IRC). Section R502 outlines the wood floor framing criteria which also includes prescriptive span tables.

When to use table r502.3.1 for floor joists?

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). 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.

What kind of loads are applied to floor joists?

The code recognizes 2 types of loads that are applied to floor joists: Live Loads and Dead Loads. Live loads are defined by the code as follows: Loads produced by the use and occupancy of the building or other structure. This does not include construction or environmental loads.