Board Span Chart

The grade and species of lumber size of lumber and the load it carries. Loads are provided for applications where the panel strength axis is applied across supports and applied parallel to supports.

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HOW TO USE THE SPAN TABLES ON PREVIOUS PAGE 1.

Board span chart. Decide whether the joists will cantilever over or not. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. In general terms joists spaced 16 inches on center can span 15 times in feet their depth in inches.

A 2x8 up to 12 feet. Click here for background information regarding design values. How to interpret the chart.

The Deck Beam Span Table on this page makes it easy to determine how far apart your posts and therefore the span of the beam should be. This is the horizontal distance from the inside surface of the supporting wall to the inside surface of the ridge board. So for 24 oc.

If you were building a deck not a porch using 2x lumber like 2x6s that flooring can be installed over joists that are up to 24 oc. A 2x8 up to 12 feet. Window Door Garage Door Headers Supporting Roof Wall Floor Loads.

Table 12 or Table 13 3. Indoors where 34 thick flooring is installed in modern construction its placed over at least a layer of 34 subfloor. Window Door.

If you use 54 decking joists must be no farther apart than 16 inches. Comparing a porch floor with 34 boards to a deck with heavier flooring. 2x12 2x6 2x8 2x10 2x12 Note.

Rather the span is based on the rafters horizontal projection. For instance if a lumber mill is cutting 24 lumber they will cut the wood green and then it will shrink during the drying process. The larger the deck the larger the joists.

Tables providing size selections for various beam spans and loading combinations for Southern Pine dimension lumber and Southern Pine glued laminated timber are available for the following applications. The span would be 115 34. Beam Span Chart Table.

You can also use the Wood Beam Calculator from the American Wood Council website to determine maximum rafter and joist lengths. Again its important to know your local codes. The span of a beam is dependent on a few variables.

For each combination of span and Span Rating loads are given for deflections of L360 L240 and L180 and maximum loads controlled by bending and shear capacity. What size board do I need to span 16 feet. Fewer posts on upper-level decks are typically more desirable to the occupants and this drives the use of larger framing materials for longer spans.

Table 3 capacities may be adjusted. If you will run decking at an angle you might need to put the joists closer together. If you use cedar it cant be smaller than a 2x6 Hemlock cant be smaller than 54x6.

Determine the decking board thickness and direction to determine joist spacing. Typically actual deck boards are 54 thick lumber and requires 16 oc. Beam span maximums are based on a maximum anticipated.

For example in the rafter span table below the highlighted cell in the 40 Live Load table indicates that 2 x 8 Southern Yellow Pine joists that have a grade of 2 that are spaced 24 apart can have a maximum span of 10 feet - 3 inches 10-3 if designing for a live load of 40 lbsft 2. Recommended Maximum Decking Span. Simplified maximum span tables for selected visual and mechanical grades of Southern Pine lumber in sizes 24 thru 212.

Deflection is limited to the span in inches divided by 240 for live load only. 2x10 to 15 feet and 2x12 to 18 feet. In general terms joists spaced 16 inches on center can span 15 times in feet their depth in inches.

So consider a simple gable roof on a 24-foot wide ranch framed with 26 exterior walls and a 1 12 ridge. Read About the Future of Board Meetings in Back to the Boardroom a Boardspan Special Report Filled with Data and Insights. But lets first explain what the numbers in the chart actually mean because it can be a bit confusing.

Dont use a board any smaller than what is recommended for that spacing for that species. Span Charts are predefined ratings of lumber at nominal sizes. Then using the lumber size of joists and the joist spacing determine if you are within the maximum allowable joist span.

The span tables listed here are based upon design values for visually graded Southern Pine dimension lumber that became effective June 1 2013. Manufacturers of wood products saw their wood in what is referred to as a Nominal Sized Lumber. Decking boards span from joist to joist.

Maximum Span Calculator for Joists Rafters. 2x10 to 15 feet and 2x12 to 18 feet. Maximum spans are inside to inside of bearings Lumber Span Tables for.

SPAN TABLES Span tables can be used to determine the size of a timber member of a particular strength class required for a given span. They also tell you what the maximum spacing should be between each section or timber member SIZE OF JOISTS mm CLEAR SPAN C16 JOIST M CLEAR SPAN C24 JOIST M 47 X 95 47 X 120 47 X 145 47 X 170 47 X 195 47 X. Decking made of 2x4s or 2x6s can span up to 24 inches.

Alaska Cedar Alaska Hemlock Alaska Spruce Alaska Yellow Cedar Aspen Baldcypress Beech-Birch-Hickory Coast Sitka Spruce Cottonwood Douglas Fir-Larch Douglas Fir-Larch North Douglas Fir-South Eastern Hemlock-Balsam Fir Eastern Hemlock-Tamarack Eastern Softwoods Eastern White Pine Hem-Fir.

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