Deck Framing

Steel Deck Framing

When wood deck framing fails, the next logical material to consider is metal. Steel is a common choice.

The least expensive metal deck framing option
Stronger and more durable than wood
Resists warping and twisting
Resists decay and insects
Non-combustible
Allows for long cantilevers
50-year lifespan

However, steel deck framing does have a few downsides:

Extremely heavy
Susceptible to corrosion; cannot be installed within 3000 feet of saltwater bodies
More expensive than wood framing

LVL Deck Framing

Laminated Veneer Lumber (LVL) is an engineered wood product that combines the strength of multiple thin layers with the durability of pressure treatment. Think of it as a heavy-duty form of plywood.

The least expensive alternative framing option
Stronger and more durable than modern pressure treated pine
Resists warping and twisting
Resists decay and insects
When properly flashed with joist tape, can last up to 25 years

Composite Deck Framing

Composite deck framing, like composite decking, is made from a mixture of wood fibers and recycled plastic. It comes with all the same advantages and disadvantages as the composite decking it’s based on.

Pros:

Low-maintenance
Resists decay, insects, and warping

Cons:

More expensive than wood or steel
More flexible than wood or metal
Can only accomodate short cantilevers

Aluminum Deck Framing

Aluminum is a higher-end metal deck framing option. It has all the mechanical advantages of steel, but without many of steel’s drawbacks.

Stronger and more durable than wood
Resists warping and twisting
Resists decay and insects
Lightweight
Resists corrosion, and can be installed near saltwater
Non-combustible
Allows for long cantilevers
50-year lifespan

However, aluminum is also the most expensive alternative deck framing option.

Pressure Treated Deck Framing

Pressure Treated Pine has long been the go-to for deck framing, but that’s starting to change. The quality of pressure treated products has dropped in recent years, resulting in decks that are less durable.

This degradation is caused by a variety of factors:

The use of different chemical treatments that are safer for people and the environment, but aren’t as good at protecting the wood
The use of younger trees that yield softer timber

Where once a pressure treated deck frame could be expected to last 25 years, that life expectancy has dropped to 10 years or even less! In short, pressure treated deck framing is not what it used to be. Because of this, many builders are turning to alternative framing options.

Deck Joist Span Charts

Pressure Treated Joist Span Charts

Deck Joist Spans without Cantilever^b
Joist Species^a	Joist Size	Spaced 12″ on Center	Spaced 16″ on Center	Spaced 24″ on Center
Southern Pine	2x6	9′11″	9′0″	7′7″
	2x8	13′1″	11′10″	9′8″
	2x10	16′2″	14′0″	11′5″
	2x12	18′0″	16′6″	13′6″
Douglas Fir Larch^d Hem Fir^d Spruce Pine Fir^d	2x6	9′6″	8′8″	7′2″
	2x8	12′6″	11′1″	9′1″
	2x10	15′8″	13′7″	11′1″
	2x12	18′0″	15′9″	12′10″
Redwood Western Cedar Ponderosa Pine^e Red Pine^e	2x6	8′10″	8′0″	7′0″
	2x8	11′8″	10′7″	8′8″
	2x10	14′11″	13′0″	10′7″
	2x12	17′5″	15′1″	12′4″

Deck Joist Spans with Cantilever^c
Joist Species^a	Joist Size	Spaced 12″ on Center	Spaced 16″ on Center	Spaced 24″ on Center
Southern Pine	2x6	6′8″	6′8″	6′8″
	2x8	10′1″	10′1″	9′8″
	2x10	14′6″	14′0″	11′5″
	2x12	18′0″	16′6″	13′6″
Douglas Fir Larch^d Hem Fir^d Spruce Pine Fir^d	2x6	6′3″	6′3″	6′3″
	2x8	9′5″	9′5″	9′1″
	2x10	13′7″	13′7″	11′1″
	2x12	18′0″	15′9″	12′10″
Redwood Western Cedar Ponderosa Pine^e Red Pine^e	2x6	5′7″	5′7″	5′7″
	2x8	8′6″	8′6″	8′6″
	2x10	12′3″	12′3″	10′7″
	2x12	16′5″	15′1″	12′4″

No. 2 grade with wet service factor.
Ground snow load, live load = 40 psf, dead load = 10 psf, L/Δ = 360.
Ground snow load, live load = 40 psf, dead load = 10 psf, L/Δ = 360 at main span, L/Δ = 180 at cantilever with a 220-pound point load applied to end.
Includes incising factor.
Northern species with no incising factor
Cantilevered spans not exceeding the nominal depth of the joist are permitted.

LVL Joist Span Charts

MAXIMUM JOIST SPAN—40 PSF LIVE LOAD, 10 PSF DEAD LOAD

JOIST SPECIES	JOIST SIZE	JOIST SPACING ON CENTER
		12″	16″	24″
		MAXIMUM DECK JOIST SPAN LENGTH (feet-inches)
PWT Treated LVL	1 – 2×6	11′1″	10′1″	8′11″
	1 – 2×8	14′10″	13′6″	11′9″
	1 – 2×10	18′11″	17′2″	15′0″
	1 – 2×12	23′0″	20′11″	18′3″

Notes:

End bearing length must be at least 1.5″.
Minimum bearing cantilever is 3.5″.
Maximum cantilever 2′ in addition to span shown.
Design conditions outside the scope of this guide may be designed using CSD software.
Joist tables are based upon 100% duration of load.

Steel Joist Span Charts

MAXIMUM JOIST SPAN—50 PSF TOTAL LOAD

JOIST TYPE	JOIST THICKNESS	JOIST SPACING ON CENTER
		12″	16″
		MAXIMUM DECK JOIST SPAN LENGTH (feet)
New Castle Steel	1 5/8″	15′	13′
	1 5/8″ Every Other Doubled	17′	15′
	1 5/8″ All Doubled	18′	17′
	2″	18′	16′
	2″ Every Other Doubled	20′	18′
	2″ All Doubled	22′	20′

MAXIMUM JOIST SPAN—75 PSF TOTAL LOAD

JOIST TYPE	JOIST THICKNESS	JOIST SPACING ON CENTER
		12″	16″
		MAXIMUM DECK JOIST SPAN LENGTH (feet)
New Castle Steel	1 5/8″	14′	12′
	1 5/8″ Every Other Doubled	16′	14′
	1 5/8″ All Doubled	18′	16′
	2″	18′	16′
	2″ Every Other Doubled	20′	18′
	2″ All Doubled	22′	20′

MAXIMUM JOIST SPAN—100 PSF TOTAL LOAD

JOIST TYPE	JOIST THICKNESS	JOIST SPACING ON CENTER
		12″	16″
		MAXIMUM DECK JOIST SPAN LENGTH (feet)
New Castle Steel	1 5/8″	12′	11′
	1 5/8″ Every Other Doubled	14′	12′
	1 5/8″ All Doubled	16′	14′
	2″	16′	15′
	2″ Every Other Doubled	19′	17′
	2″ All Doubled	21′	19′

MAXIMUM JOIST SPAN—125 PSF TOTAL LOAD

JOIST TYPE	JOIST THICKNESS	JOIST SPACING ON CENTER
		12″	16″
		MAXIMUM DECK JOIST SPAN LENGTH (feet)
New Castle Steel	1 5/8″	10′	9′
	1 5/8″ Every Other Doubled	12′	10′
	1 5/8″ All Doubled	14′	12′
	2″	15′	14′
	2″ Every Other Doubled	17′	16′
	2″ All Doubled	19′	17′

MAXIMUM JOIST SPAN—150 PSF TOTAL LOAD

JOIST TYPE	JOIST THICKNESS	JOIST SPACING ON CENTER
		12″	16″
		MAXIMUM DECK JOIST SPAN LENGTH (feet)
New Castle Steel	1 5/8″	9′	8′
	1 5/8″ Every Other Doubled	10′	9′
	1 5/8″ All Doubled	12′	10′
	2″	14′	13′
	2″ Every Other Doubled	16′	14′
	2″ All Doubled	18′	16′

MAXIMUM JOIST SPAN—200 PSF TOTAL LOAD

JOIST TYPE	JOIST THICKNESS	JOIST SPACING ON CENTER
		12″	16″
		MAXIMUM DECK JOIST SPAN LENGTH (feet)
New Castle Steel	1 5/8″	8′	7′
	1 5/8″ Every Other Doubled	9′	7′
	1 5/8″ All Doubled	10′	8′
	2″	13′	11′
	2″ Every Other Doubled	15′	13′
	2″ All Doubled	16′	15′

Deck Beam Span Charts

Pressure Treated Beam Span Charts

Data collected from IRC 2021, Part 3, Chapter 5, Section R507.5.

TABLE R507.5(1)

MAXIMUM DECK BEAM SPAN—40 PSF LIVE LOAD^c

BEAM SPECIES^d	BEAM SIZE^e	EFFECTIVE DECK JOIST SPAN LENGTH^{a, i, j}(feet)
		6′	8′	10′	12′	14′	16′	18′
		MAXIMUM DECK BEAM SPAN LENGTH (feet-inches)^{a, b, f}
Southern pine	1 – 2×6	4′7″	4′0″	3′7″	3′3″	3′0″	2′10″	2′8″
	1 – 2×8	5′11″	5′1″	4′7″	4′2″	3′10″	3′7″	3′5″
	1 – 2×10	7′0″	6′0″	5′5″	4′11″	4′7″	4′3″	4′0″
	1 – 2×12	8′3″	7′1″	6′4″	5′10″	5′5″	5′0″	4′9″
	2 – 2×6	6′11″	5′11″	5′4″	4′10″	4′6″	4′3″	4′0″
	2 – 2×8	8′9″	7′7″	6′9″	6′2″	5′9″	5′4″	5′0″
	2 – 2×10	10′4″	9′0″	8′0″	7′4″	6′9″	6′4″	6′0″
	2 – 2×12	12′2″	10′7″	9′5″	8′7″	8′0″	7′5″	7′0″
	3 – 2×6	8′6″	7′5″	6′8″	6′1″	5′8″	5′3″	4′11″
	3 – 2×8	10′11″	9′6″	8′6″	7′9″	7′2″	6′8″	6′4″
	3 – 2×10	13′0″	11′2″	10′0″	9′2″	8′6″	7′11″	7′6″
	3 – 2×12	15′3″	13′3″	11′10″	10′9″	10′0″	9′4″	8′10″
Douglas fir-larch^g Hem-fir^g Spruce-pine-fir	1 – 2 x 6	4′1″	3′6″	3′0″	2′8″	2′5″	2′3″	2′1″
	1 – 2×8	5′6″	4′8″	4′0″	3′6″	3′2″	2′11″	2′9″
	1 – 2×10	6′8″	5′10″	5′1″	4′6″	4′1″	3′9″	3′6″
	1 – 2×12	7′9″	6′9″	6′0″	5′6″	5′0″	3′9″	3′6″
	2 – 2×6	6′1″	5′3″	4′9″	4′4″	3′11″	3′7″	3′3″
	2 – 2×8	8′2″	7′1″	6′4″	5′9″	5′2″	4′8″	4′4″
	2 – 2×10	10′0″	8′7″	7′9″	7′0″	6′6″	6′0″	5′6″
	2 – 2×12	11′7″	10′0″	8′11″	8′2″	7′7″	7′1″	6′8″
	3 – 2×6	7′8″	6′8″	6′0″	5′6″	5′1″	4′9″	4′6″
	3 – 2×8	10′3″	8′10″	7′11″	7′3″	6′8″	6′3″	5′11″
	3 – 2×10	12′6″	10′10″	9′8″	8′10″	8′2″	7′8″	7′2″
	3 – 2×12	14′6″	12′7″	11′3″	10′3″	9′6″	8′11″	8′5″
Redwood^h Western cedars^h Ponderosa pine^h Red pine^h	1 – 2×6	4′2″	3′7″	3′1″	2′9″	2′6″	2′3″	2′2″
	1 – 2×8	5′4″	4′7″	4′1″	3′7″	3′3″	3′0″	2′10″
	1 – 2×10	6′6″	5′7″	5′0″	4′7″	4′2″	3′10″	3′7″
	1 – 2×12	7′6″	6′6″	5′10″	5′4″	4′11″	4′7″	4′4″
	2 – 2×6	6′2″	5′4″	4′10″	4′5″	4′0″	3′8″	3′4″
	2 – 2×8	7′10″	6′10″	6′1″	5′7″	5′2″	4′10″	4′5″
	2 – 2×10	9′7″	8′4″	7′5″	6′9″	6′3″	5′10″	5′6″
	2 – 2×12	11′1″	9′8″	8′7″	7′10″	7′3″	6′10″	6′5″
	3 – 2×6	7′8″	6′9″	6′0″	5′6″	5′1″	4′9″	4′6″
	3 – 2×8	9′10″	8′6″	7′7″	6′11″	6′5″	6′0″	5′8″
	3 – 2×10	12′0″	10′5″	9′4″	8′6″	7′10″	7′4″	6′11″
	3 – 2×12	13′11″	12′1″	10′9″	9′10″	9′1″	8′6″	8′1″

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.0479 kPa, 1 pound = 0.454 kg.

Interpolation permitted. Extrapolation not permitted.
Beams supporting a single span of joists with or without cantilever.
Dead load = 10 psf, L/Δ = 360 at main span, L/Δ = 180 at cantilever. Snow load is not assumed to be concurrent with live load.
No. 2 grade, wet service factor included.
Beam depth shall be equal to or greater than the depth of intersecting joist for a flush beam connection.
Beam cantilevers are limited to the adjacent beam’s span divided by 4.
Includes incising factor.
Incising factor not included.
Deck joist span as shown in Figure R507.5.
For calculation of effective deck joist span, the actual joist span length shall be multiplied by the joist span factor in accordance with Table R507.5(5).

TABLE R507.5(2)

MAXIMUM DECK BEAM SPAN—50 PSF GROUND SNOW LOAD^c

BEAM SPECIES^d	BEAM SIZE^e	EFFECTIVE DECK JOIST SPAN LENGTH (feet)^{a, i, j}
		6′	8′	10′	12′	14′	16′	18′
		MAXIMUM DECK BEAM SPAN LENGTH (feet-inches)^{a, b, f}
Southern pine	1 – 2×6	4′6″	3′11″	3′6″	3′2″	2′11″	2′9″	2′7″
	1 – 2×8	5′9″	4′11″	4′5″	4′0″	3′9″	3′6″	3′3″
	1 – 2×10	6′9″	5′10″	5′3″	4′9″	4′5″	4′2″	3′11″
	1 – 2×12	8′0″	6′11″	6′2″	5′8″	5′3″	4′11″	4′7″
	2 – 2×6	6′8″	5′9″	5′2″	4′9″	4′4″	4′1″	3′10″
	2 – 2×8	8′6″	7′4″	6′7″	6′0″	5′7″	5′2″	4′11″
	2 – 2×10	10′1″	8′9″	7′10″	7′1″	6′7″	6′2″	5′10″
	2 – 2×12	11′11″	10′3″	9′2″	8′5″	7′9″	7′3″	6′10″
	3 – 2×6	7′11″	7′2″	6′6″	5′11″	5′6″	5′1″	4′10″
	3 – 2×8	10′5″	9′3″	8′3″	7′6″	6′11″	6′6″	6′2″
	3 – 2×10	12′8″	10′11″	9′9″	8′11″	8′3″	7′9″	7′3″
	3 – 2×12	14′11″	12′11″	11′6″	10′6″	9′9″	9′1″	8′7″
Douglas fir-larch^g Hem-fir^g Spruce-pine-fir^g	1 – 2×6	4′0″	3′5″	2′11″	2′7″	2′4″	2′2″	2′0″
	1 – 2×8	5′4″	4′7″	3′11″	3′5″	3′1″	2′10″	2′8″
	1 – 2×10	6′7″	5′8″	4′11″	4′5″	4′0″	3′8″	3′5″
	1 – 2×12	7′7″	6′7″	5′11″	5′4″	4′10″	4′6″	4′2″
	2 – 2×6	6′0″	5′2″	4′7″	4′2″	3′10″	3′5″	3′2″
	2 – 2×8	8′0″	6′11″	6′2″	5′8″	5′0″	4′7″	4′2″
	2 – 2×10	9′9″	8′5″	7′7″	6′11″	6′4″	5′10″	5′4″
	2 – 2×12	11′4″	9′10″	8′9″	8′0″	7′5″	6′11″	6′6″
	3 – 2×6	7′6″	6′6″	5′9″	5′3″	4′11″	4′7″	4′4″
	3 – 2×8	10′0″	8′8″	7′9″	7′1″	6′6″	6′1″	5′8″
	3 – 2×10	12′3″	10′7″	9′6″	8′8″	8′0″	7′6″	7′0″
	3 – 2×12	14′3″	12′4″	11′0″	10′1″	9′4″	8′9″	8′3″
Redwood^h Western cedars^h Ponderosa pine^h Red pine^h	1 – 2×6	4′1″	3′6″	3′0″	2′8″	2′5″	2′3″	2′1″
	1 – 2×8	5′2″	4′6″	4′0″	3′6″	3′2″	2′11″	2′9″
	1 – 2×10	6′4″	5′6″	4′11″	4′6″	4′1″	3′9″	3′6″
	1 – 2×12	7′4″	6′4″	5′8″	5′2″	4′10″	4′6″	4′3″
	2 – 2×6	6′1″	5′3″	4′8″	4′4″	3′11″	3′6″	3′3″
	2 – 2×8	7′8″	6′8″	5′11″	5′5″	5′0″	4′8″	4′3″
	2 – 2×10	9′5″	8′2″	7′3″	6′8″	6′2″	5′9″	5′5″
	2 – 2×12	10′11″	9′5″	8′5″	7′8″	7′2″	6′8″	6′3″
	3 – 2×6	7′1″	6′5″	5′11″	5′5″	5′0″	4′8″	4′5″
	3 – 2×8	9′4″	8′4″	7′5″	6′10″	604	5′11″	5′7″
	3 – 2×10	11′9″	10′2″	9′1″	8′4″	7′8″	7′2″	6′9″
	3 – 2×12	13′8″	11′10″	10′7″	9′8″	8′11″	8′4″	7′10″

For SI: 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.0479 kPa, 1 pound = 0.454 kg.

Interpolation allowed. Extrapolation is not allowed.
Beams supporting a single span of joists with or without cantilever.
Dead load = 10 psf, L/Δ = 360 at main span, L/Δ = 180 at cantilever. Snow load not assumed to be concurrent with live load.
No. 2 grade, wet service factor included.
Beam depth shall be equal to or greater than the depth of intersecting joist for a flush beam connection.
Beam cantilevers are limited to the adjacent beam’s span divided by 4.
Includes incising factor.
Incising factor not included.
Deck joist span as shown in Figure R507.5.
For calculation of effective deck joist span, the actual joist span length shall be multiplied by the joist span factor in accordance with Table R507.5(5).

TABLE R507.5(3)

MAXIMUM DECK BEAM SPAN—60 PSF GROUND SNOW LOAD^c

BEAM SPECIES^d	BEAM SIZE^e	EFFECTIVE DECK JOIST SPAN LENGTH^{a, i, j}(feet)
		6′	8′	10′	12′	14′	16′	18′
		MAXIMUM DECK BEAM SPAN LENGTH (feet-inches)^{a, b, f}
Southern pine	1 – 2×6	4′2″	3′7″	3′3″	2′11″	2′9″	2′6″	2′5″
	1 – 2×8	5′3″	4′7″	4′1″	3′9″	3′5″	3′3″	3′0″
	1 – 2×10	6′3″	5′5″	4′10″	4′5″	4′1″	3′10″	3′7″
	1 – 2×12	7′5″	6′5″	5′9″	5′3″	4′10″	4′6″	4′3″
	2 – 2×6	6′2″	5′4″	4′9″	4′4″	4′0″	3′9″	3′7″
	2 – 2×8	7′10″	6′10″	6′1″	5′7″	5′2″	4′10″	4′6″
	2 – 2×10	9′4″	8′1″	7′3″	6′7″	6′1″	5′8″	5′4″
	2 – 2×12	11′0″	9′6″	8′6″	7′9″	7′2″	6′9″	6′4″
	3 – 2×6	7′5″	6′9″	6′0″	5′6″	5′1″	4′9″	4′6″
	3 – 2×8	9′9″	8′6″	7′8″	6′11″	6′5″	6′0″	5′8″
	3 – 2×10	11′8″	10′2″	9′1″	8′3″	7′8″	7′2″	6′9″
	3 – 2×12	13′9″	11′11″	10′8″	9′9″	9′0″	8′5″	7′11″
Douglas fir-larch^g Hem-fir^g Spuce-pine-fir^g	1 – 2×6	3′8″	3′1″	2′8″	2′4″	2′2″	2′0″	1′10″
	1 – 2×8	5′0″	4′1″	3′6″	3′1″	2′10″	2′7″	2′5″
	1 – 2×10	6′1″	5′2″	4′6″	4′0″	3′7″	3′4″	3′2″
	1 – 2×12	7′1″	6′1″	5′5″	4′10″	4′5″	4′1″	3′10″
	2 – 2×6	5′6″	4′9″	4′3″	3′10″	3′5″	3′1″	2′10″
	2 – 2×8	7′5″	6′5″	5′9″	5′0″	4′6″	4′1″	3′9″
	2 – 2×10	9′0″	7′10″	7′0″	6′4″	5′9″	5′2″	4′10″
	2 – 2×12	10′6″	9′1″	8′1″	7′5″	6′10″	6′4″	5′10″
	3 – 2×6	6′11″	6′0″	5′4″	4′11″	4′6″	4′2″	3′10″
	3 – 2×8	9′3″	8′0″	7′2″	6′6″	6′1″	5′6″	5′0″
	3 – 2×10	11′4″	9′10″	8′9″	8′0″	7′5″	6′11″	6′5″
	3 – 2×12	13′2″	11′5″	10′2″	9′4″	8′7″	8′1″	7′7″
Redwood^h Western cedars^h Ponderosa pine^h Red pine^h	1 – 2×6	3′9″	3′2″	2′9″	2′5″	2′2″	2′0″	1′11″
	1 – 2×8	4′10″	4′2″	3′7″	3′2″	2′11″	2′8″	2′6″
	1 – 2×10	5′10″	5′1″	4′6″	4′1″	3′8″	3′5″	3′3″
	1 – 2×12	6′10″	5′11″	5′3″	4′10″	4′5″	4′2″	3′11″
	2 – 2×6	5′7″	4′10″	4′4″	3′11″	3′6″	3′2″	2′11″
	2 – 2×8	7′1″	6′2″	5′6″	5′0″	4′7″	4′2″	3′10″
	2 – 2×10	8′8″	7′6″	6′9″	6′2″	5′8″	5′4″	4′11″
	2 – 2×12	10′1″	8′9″	7′10″	7′2″	6′7″	6′2″	5′10″
	3 – 2×6	6′8″	6′1″	5′5″	5′0″	4′7″	4′3″	3′11″
	3 – 2×8	8′9″	7′9″	6′22″	6′4″	5′20″	5′5″	5′3″
	3 – 2×10	10′11″	9′5″	8′5″	7′8″	7′3″	6′8″	6′3″
	3 – 2×12	12′8″	10′11″	9′9″	8′11″	8′3″	7′9″	7′3″

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.0479 kPa, 1 pound = 0.454 kg.

Interpolation allowed. Extrapolation is not allowed.
Beams supporting a single span of joists with or without cantilever.
Dead load = 10 psf, L/Δ = 360 at main span, L/Δ = 180 at cantilever. Snow load not assumed to be concurrent with live load.
No. 2 grade, wet service factor included.
Beam depth shall be equal to or greater than the depth of intersecting joist for a flush beam connection.
Beam cantilevers are limited to the adjacent beam’s span divided by 4.
Includes incising factor.
Incising factor not included.
Deck joist span as shown in Figure R507.5.
For calculation of effective deck joist span, the actual joist span length shall be multiplied by the joist span factor in accordance with Table R507.5(5).

TABLE R507.5(4)

MAXIMUM DECK BEAM SPAN—70 PSF GROUND SNOW LOAD^c

BEAM SPECIES^d	BEAM SIZE^e	EFFECTIVE DECK JOIST SPAN LENGTH (feet)^{a, i, j}
		6′	8′	10′	12′	14′	16′	18′
		MAXIMUM DECK BEAM SPAN LENGTH (feet-inches)^{a, b, f}
Southern pine	1 – 2×6	3′11″	3′4″	3′0″	2′9″	2′6″	2′4″	2′3″
	1 – 2×8	4′11″	4′3″	3′10″	3′6″	3′3″	3′0″	2′10″
	1 – 2×10	5′10″	5′1″	4′6″	4′2″	3′10″	3′7″	3′4″
	1 – 2×12	6′11″	6′0″	5′4″	4′11″	4′6″	4′3″	4′0″
	2 – 2×6	5′9″	5′0″	4′6″	4′1″	3′9″	3′6″	3′4″
	2 – 2×8	7′4″	6′4″	5′8″	5′2″	4′10″	4′6″	4′3″
	2 – 2×10	8′9″	7′7″	6′9″	6′2″	5′8″	5′4″	5′0″
	2 – 2×12	10′3″	8′11″	8′0″	7′3″	6′9″	6′3″	5′11″
	3 – 2×6	7′0″	6′3″	5′7″	5′1″	4′9″	4′5″	4′2″
	3 – 2×8	9′3″	8′0″	7′2″	6′6″	6′0″	5′8″	5′4″
	3 – 2×10	10′11″	9′6″	8′6″	7′9″	7′2″	6′8″	6′4″
	3 – 2×12	12′11″	11′2″	10′0″	9′1″	8′5″	7′11″	7′5″
Douglas fir-larch^g Hem-fir^g Spruce-pine-fir^g	1 – 2×6	3′5″	2′10″	2′5″	2′2″	2′0″	1′10″	1′9″
	1 – 2×8	4′7″	3′8″	3′2″	2′10″	2′7″	2′5″	2′4″
	1 – 2×10	5′8″	4′9″	4′1″	3′8″	3′4″	3′1″	2′11″
	1 – 2×12	6′7″	5′8″	5′0″	4′6″	4′1″	3′10″	3′7″
	2 – 2×6	5′2″	4′6″	4′0″	3′5″	3′1″	2′10″	2′7″
	2 – 2×8	6′11″	6′0″	5′3″	4′7″	4′1″	3′8″	3′5″
	2 – 2×10	8′5″	7′4″	6′6″	5′10″	5′2″	4′9″	4′5″
	2 – 2×12	9′10″	8′6″	7′7″	6′11″	6′4″	5′9″	5′4″
	3 – 2×6	6′6″	5′7″	5′0″	4′7″	4′2″	3′9″	3′5″
	3 – 2×8	8′8″	7′6″	6′8″	6′1″	5′6″	5′0″	4′7″
	3 – 2×10	10′7″	9′2″	8′2″	7′6″	6′11″	6′4″	5′10″
	3 – 2×12	12′4″	10′8″	9′7″	8′9″	8′1″	7′7″	7′1″
Redwood^h Western cedars^h Ponderosa pine^h Red pine^h	1 – 2×6	3′6″	2′11″	2′6″	2′3″	2′0″	1′11″	1′9″
	1 – 2×8	4′6″	3′10″	3′3″	2′11″	2′8″	2′6″	2′4″
	1 – 2×10	5′6″	4′9″	4′2″	3′9″	3′5″	3′2″	3′0″
	1 – 2×12	6′4″	5′6″	4′11″	4′6″	4′2″	3′11″	3′8″
	2 – 2×6	5′3″	4′7″	4′1″	3′6″	3′2″	2′11″	2′8″
	2 – 2×8	6′8″	5′9″	5′2″	4′8″	4′2″	3′10″	3′6″
	2 – 2×10	8′2″	7′1″	6′4″	5′9″	5′4″	4′10″	4′6″
	2 – 2×12	9′5″	8′2″	7′4″	6′8″	6′2″	5′9″	5′5″
	3 – 2×6	6′4″	5′8″	5′1″	4′8″	4′3″	3′10″	3′6″
	3 – 2×8	8′4″	7′3″	6′5″	5′11″	5′5″	5′1″	4′8″
	3 – 2×10	10′2″	8′10″	7′11″	7′2″	6′8″	6′3″	5′11″
	3 – 2×12	11′10″	10′3″	9′2″	8′4″	7′9″	7′3″	6′10″

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.0479 kPa, 1 pound = 0.454 kg.

Interpolation allowed. Extrapolation is not allowed.
Beams supporting a single span of joists with or without cantilever.
Dead load = 10 psf, L/Δ = 360 at main span, L/Δ = 180 at cantilever. Snow load not assumed to be concurrent with live load.
No. 2 grade, wet service factor included.
Beam depth shall be equal to or greater than the depth of intersecting joist for a flush beam connection.
Beam cantilevers are limited to the adjacent beam’s span divided by 4.
Includes incising factor.
Incising factor not included.
Deck joist span as shown in Figure R507.5.
For calculation of effective deck joist span, the actual joist span length shall be multiplied by the joist span factor in accordance with Table R507.5(5).

TABLE R507.5(5)

JOIST SPAN FACTORS FOR CALCULATING EFFECTIVE DECK JOIST SPAN [for use with Note j in Tables R507.5(1), R507.5(2), R507.5(3) and R507.5(4)]

C/J^a	JOIST SPAN FACTOR
0 (no cantilever)	0.66
1/12 (0.87)	0.72
1/10 (0.10)	0.80
1/8 (0.125)	0.84
1/6 (0.167)	0.90
1/4 (0.250)	1.00

For SI: 1 foot = 304.8 mm.

C = actual joist cantilever length (feet); J = actual joist span length (feet).

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