What is the typical load on a JJI joist?
JJI Joist Depth Characteristic load per metre run (kN/m) 195 75.0 220 75.0 235 71.0 245 64.0 300 60.0 350 41.0 400 32.0 450 31.0 Table 3. JJI-Joist vertical loads Notes for Table 3: 1.alues for point load can be calculated as P=UDL x (L V b +60)/1000 where L b is the contact length of the load applied in mm
What is a joist span table?
Joist Span Table. Joist span table - Use these tables to determine floor joist spans based on grade of lumber, size of joist, floor joist spacing, and a live load of 30 lbs/ft 2 or 40 lbs/ft 2. These tables can also be used to determine deck joist span.
What is the maximum span of a floor joist?
Floor Joist Span Tables for various Sizes and Species of Wood. For example, in the joist span table below, the highlighted cell shows that 2" x 8" Southern Yellow Pine joists, that have a grade of #2, and are spaced 24" apart can have a maximum span of 10 feet - 3 inches (10-3) if designing for a live load of 40 lbs/ft 2.
Can I design JJI-joist rafters with only one support at the lower end?
It is possible to design the JJI-Joist rafters with only one support at the lower end if the top end (Ridge) is resting on another rafter leaning in the opposite direction. This, however, leads to horizontal reactions at the lower end and higher axial loads that need to be considered by a qualified engineer. Engineering span measured on plan
What are Jji joists?
A JJI-Joist is a composite engineered timber joist, combining 45mm deep high-grade finger jointed softwood flanges with a 9mm thick oriented strand board (OSB/3) web. The JJI-Joist relies on a unique combination of engineered products designed to complement each other and deliver outstanding performance.
What is maximum span for 2x8 joist?
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”. Finally, a single deck beam has a maximum span of 5' 11” and double maxes out at 8' 9”.
What is the maximum span for a 2x6 floor joist?
2-grade 2×6 joists can span up to 10 feet 9 inches from beam to beam when spaced the standard 16 inches apart with a maximum live load of 30 inches per square foot.
How do you calculate joists span?
As a rule, the larger the deck, the larger the joists. For example, joists spaced 16 inches from the center of the joist next to it can span 1.5 times in feet the depth of their inches. To learn more about deck joist sizing, spacing, and allowable span, reference this chart.
Can a 2x8 span 10 feet?
In general terms, joists spaced 16 inches on center can span 1.5 times in feet their depth in inches. A 2x8 up to 12 feet; 2x10 to 15 feet and 2x12 to 18 feet.26-Mar-2021
How far can a 2x8 span without support?
Based on different manufacturers' specifications, the maximum span a 2×8 LVL is from 12' to 15'. Spans are also affected by the species of wood used in the manufacture of the laminated joists, with western woods edging out eastern woods in unsupported span distance.
Are 2x6 strong enough for floor joists?
2 Answers. Show activity on this post. 2x6 joists at the span that you are talking about (16' and 18') are not strong enough to support a floor as a living space. With a span like that the timber size that you sister in would have to be at least 2x10's.27-Jun-2017
How far can a 2x6 decking span without support?
Decking made of 2x4s or 2x6s can span up to 24 inches. If you will run decking at an angle, you might need to put the joists closer together.22-Jun-2020
Are 2x6 OK for floor joists?
Yes, 2 X 6 lumber can be used for floor joists, but the allowable clear span is only about 4 or 5 feet. Such a small span is seldom useful.
What size joist do I need for a 12 foot span?
Thus you will need a 2×6 (2-by-6) size of floor joists for 12 foot span at standard 12 inches spaced.
How far can a 4X10 beam span?
9'-8"Dimensional Lumber Deck Beam Span ChartJoist SpansDouglas Fir-Larch, Hem-Fir, Spruce-Pine-Fir, Redwood, Cedars, Ponderosa Pine, Red Pine4X109'-8"4X1211'-2"3-2X67'-1"3-2X89'-5"17 more rows
How far can a 2x10 beam span without support?
How Far Can a 2×10 Beam or Header Span? A 2×10 beam – made up of two 2x10s nailed together – can span up to 11' without support beneath a deck that is 4' wide. For a more normal-sized deck, the same beam can span 8', supporting a deck that is 8' wide. You can also triple a 2×10 beam.
What is the maximum span for a 2x12 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 Grade2 x 121223' - 0"1619' - 11"2416' - 3"10 more rows
What is the maximum span for floor joist?
A floor joist can span nearly 26' in the most extreme cases. A select douglas fir 2×12 supporting a 30 psf live load and 10 psf dead load, spaced at 12” will have the greatest span length.
Does double joists increase span?
For example, if you double the thickness or number of joists in a floor, the distance the boards can span will increase by approximately 25%. But if you double the width of the boards, the distance the joists can span increases between 80% to 100%, even though you're using the same board feet of lumber.
What is the maximum span of a wood beam?
In general terms, joists spaced 16 inches on center can span 1.5 times in feet their depth in inches. A 2x8 up to 12 feet; 2x10 to 15 feet and 2x12 to 18 feet. how far can a steel beam span without support?16-Feb-2020
HOW FAR CAN 2 2x12 span?
11'-11"Dimensional Lumber Deck Beam Span ChartJoist SpansSouthern Pine2-2x88'-6"2-2x1010'-1"2-2x1211'-11"3-2x67'-11"17 more rows
Can a 2x10 span 16 feet?
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.
How far can a 2x10 joist span?
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.
What size floor joist do I need for a 16 foot span?
What size floor joist to span 16 feet:- as per general rules and guideline, a 2×8 (2-by-8) size of floor joists made of southern yellow pine, graded as #1 can allows joist spans up to 16 feet for a live load of 30 pounds per square foot and dead load of 10 pounds per square foot when spaced 16 inches apart.
How far can a 2x8 joist span?
In general terms, joists spaced 16 inches on center can span 1.5 times in feet their depth in inches. A 2x8 up to 12 feet; 2x10 to 15 feet and 2x12 to 18 feet. The larger the deck, the larger the joists.26-Mar-2021
Are 2x6 OK for floor joists?
Yes, 2 X 6 lumber can be used for floor joists, but the allowable clear span is only about 4 or 5 feet. Such a small span is seldom useful.
How far can a double 2x8 span without support?
In general, a 2×8 will span 1.5 x 8, so 12-feet.
How big of a beam do I need to span 16 feet?
For a 16 foot span, you will need atleast 3-2×14 or 6×14 size of wood beam. Thus, a 3 nailed 2×14 or 3-2×14 or 6×14 wood beam can allow to span 16 feet. For a 16-foot spans, the wood beam has to be at least 14 inches in depth and 6″ in width (3-2×14) used for residential building, wood frame structure or projects.
What size beam will span 10 feet?
A double ply beam can span in feet if there is no overhang beyond it. A double 2x12 beam can span 12 feet, a double 2x10 can span 10 feet, and so on.
How far can an I joist span without support?
Span refers to the length of the I-joist. The L/480 table with a 40 per square foot live load and a 20 per square foot dead load with a depth of 11 7/8 inches will give you spans according to joint weight. With these factors, the lightest joist will have a maximum span of 17 feet, 8 inches.
How far can a load bearing beam span?
When supporting joists that span 12 feet with no overhang beyond the beam, a double ply beam can span in feet a value equal to its depth in inches. A double 2x12 beam can span 12 feet; a (2) 2x10 can span 10 feet and so on.14-May-2020
How To Buy
JJI-Joists are available through our network of UK distributors, for contact details of your nearest distributor visit our Distributor Map.
Fire Retardent (FR) Treatment
James Jones and Sons has been heavily involved in the Structural Timber Association's on-going project to develop fire design guidance and test methods aimed at mitigating the risk of fire during construction of timber frame buildings.
Durability and treatment
JJI-Joists are untreated and when used in a Service Class 1 or 2 environment, the ETA certificate advises that they may be taken to have a service life in excess of 50 years.
US East
To download our VERSA-LAM ® span and size chart PDFs, click on the links below.
US West
To download our VERSA-LAM ® span and size chart PDFs, click on the links below.
BC Calc
BC Calc ® performs engineering analysis to help our customers size beams, joists, columns, studs and tall walls for their building projects. It is simple to use, yet flexible enough to analyze a variety of common applications. The user enters the member geometry, adds loads, holes and other relevant data and then selects a product for analysis.