What is the maximum depth of an open web steel joist?

These members have been standardized for depths from 20 inches (508 mm) to 120 inches (3048 mm), and spans to 120 feet (36,576 mm). The standard depth at the bearing ends has been established at 7 1/2 inches (191 mm) for all Joist Girders.

What is the common depth of steel joists?

Standard depth = 2.5”. Deeper depths may be available from joist manufacturer. Joist Substitutes standard depths are 2.5 inches and may have extended ends for overhangs (outriggers).

What is K series joist?

The term “Open Web Steel Joists K-Series,” as used herein, refers to open web, parallel chord, load-carrying members suitable for the direct support of floors and roof decks in build- ings, utilizing hot-rolled or cold-formed steel, including cold- formed steel whose yield strength* has been attained by cold working.

What is the standard end bearing depth of a K series joist?

2 1/2 inches
Steel joists and Joist Girders shall carry the designations and meet the requirements of the Steel Joist Institute Standard Specifications Load Tables & Weight Tables of latest adoption. K-Series joists are furnished with parallel chords only, and with minimum standard end bearing depth of 2 1/2 inches (64 mm).

How do you calculate the depth of a steel joist?

To calculate the necessary depth of a beam, divide the span (in inches) by 20. For example, a 25′ span would be 25×12 / 20 = 15”. The width of this beam would be between 1/3 and ½ the depth.

How are open web steel joists made?

Today, open web steel joists are one of the most commonly used framing systems for floors and roofs in buildings. … These joists were made by pressing the sheets into the form of channels and welding them back-to-back, giving the appearance of light I-shaped beams.

How far can a 2×6 metal joist span?

A 2×6 spaced 16 inches apart can span a maximum distance of 13 feet 5 inches when used as a rafter, 10 feet 9 inches when used as a joist, and 6 feet 11 inches when used as a deck beam to support joists with a 6-foot span.

What is steel joist bridging?

Bridging provides lateral restraint either permanently or until other means of restraint are provided. • When deck is attached this provides the lateral restraint to the joist top chord. \continuous and anchored at both ends. Limit the magnitude and placement of construction loads.

What is the difference between a joist and a truss?

The joist supports the load which the floor is built to bear. A truss is used to support the roof.

How far can a 2×8 joist span?

Depending on various factors, the maximum span for a 2×8 floor joist is 16′ 6”. The maximum span for roof rafters is 23′ 9”. For headers, the maximum span is 11′ 2”.

Are 2×6 strong enough for deck joists?

For upper-level decks, 2×10 is recommended as the minimum size to use for strong guard post connections. 2×6 joists should only be used on ground-level decks that do not require, and will not provide for, any guards. … Most decking is not strong enough to support longer spans than 16″.

How much load can a 2×6 support?

According to the Codes, a 2×6 on edge with the weight pressing through 5.5” of wood will support approximately 53lbs per linear foot. So, an 8-foot length will support about 424lbs. However, a short span 2×6 on edge can support between 600 and 900lbs depending on wood species, grade, and other factors.

Can a 2×8 span 16 feet?

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”.

How much load can a 2×8 support?

The weight that can be supported by a double or triple wood header
Span (feet)Weight Supported (lb)
2 x 2″ x 6″2 x 2″ x 8″
422504690
616803130
82660

What is the max load on a 2×8 floor joist?

Max. Live Load 30 lbs/ft2 (1436 N/m2)
Maximum Span (ft – in)
Nominal Size (inches)Joist Spacing Center to Center (inches)Lumber Grade
2 x 81215′ – 10″
1614′ – 5″
2412′ – 4″

Can I use 2×8 for floor joist?

The rule of thumb is 1″ of depth for each foot of run. EX an 8′ span should have a 2×8 joist. The same rule of thumb applies to door and window headers but you should use 4x wood. Ex an 8 foot window header should have an 8′4×8.

Can I use 2×8 for deck joists?

2×8 for joists will be fine, with 16″ OC. Should use 2×10 for beams but 2×8 will be fine as well. If you are worried you can triple the 2×8 for the beams but double will be sufficient. You should put the beams at 7 and 14 feet out from the house, with the piers you should do 3 per beam with spacing of 1, 7, 13.

How far can I joist span without support?

The length of one 2×10 joist span depends on the wood species and how far apart it is from the next 2×10. A 2×10 southern yellow pine joist can span 16 feet and 1 inch without support. A doubled 2×10 beam can span 11′ without support for a deck that is 4′ wide.

Should floor joist be 2×8 or 2×10?

Often, 2×10 joists spaced 24-inches o.c. will provide a stronger and stiffer floor assembly than 2×8 joists of the same grade and species that are spaced 16-inches o.c. E value or modulus of elasticity of the individual elements.

What is the maximum span of a 2×10 floor joist?

Douglas fir 2-by-10 joists graded as “Structural Select” allows joist spans up to 21 feet for a live load of 30 pounds per square foot when spaced 12 inches apart, 19 feet 1 inch for 16 inch spacing and 16 feet 8 inches for 24 inch spacing.

How do you strengthen a 2×8 floor joist?

The best way to strengthen floor joists from underneath is to make a supporting mid-span beam or wall beneath the wobbling joists. Using jack posts or 6×6 posts and 2×10 or 2×8 beams perpendicular to the joists will solve any wobble and ensure your joists never move again.

What size board do I need to span 16 feet?

Wood beam size for a 16 foot span:- as per general thumb rule, for a 16 foot span, size of wood beam or lumber joist should be 2×10 which placed at 16″ apart from centre used for residential building or projects or construction in which depth of section of beam is 250mm (10″) and width of beam is 50 mm or 2″.

How far can a 2×8 span for a roof?

Max. Live Load 20 lbs/ft2 (956 N/m2)
Maximum Span (ft – in)
Nominal Size (inches)Rafter Spacing, Center to Center, OC (inches)Lumber Grade
2 x 62413′
2 x 81221′ – 7
1619′ – 7”

How far can a 2×8 cantilever?

24″
Deck Joist Cantilever Rules and Limits

Many building departments limit joist cantilevers to 24″ maximum. Generally, you should use at least five framing nails to attach the rim joist to the ends of your joists.