The following are details of the code requirements of the 2015 International

Residential Code for single-story decks.

The 2015 International Residential Code Section R507 contains additional information and details specific to deck construction.

DECK POST HEIGHT (see footnote a)- Table R507.8 DECK POST SIZE MAXIMUM HEIGHT (see footnote a)

4 X 4 8 feet 4 X 6 8 feet 6 X 6 14 feet

Footnote a: Measured to the underside of the beam

Deck Ledger Attachment Details & Specifications Mason County Checklist item #56 and #69 additional wood and fastener

requirements Lag screws and bolts shall be staggered per diagram below Lag screw tips shall extend beyond the inside face of the band/rim joist Maximum gap between band/rim joist and ledger shall be ½” with spacer(s) Flashing shall be installed to prevent water intrusion at structural attachment. Deck Ledger shall be minimum 2”x 8” pressure preservative treated, No. 2 grade lumber.

(IRC Section R507.2.1) Ledger shall be equal to or greater than joist size and larger than 2 x 8 Deck ledger shall not be supported on stone or masonry veneer.

Decks over 30” must be installed with a lateral load connection. See below

Ledger Details and Requirements

Deck Attachment for Lateral Loads

Hold down tension devices shall be installed in not less than two locations per deck, within 24 inches of end of the deck. Each device shall have an allowable stress design capacity of not less than 1,500 pounds.

FOOTING REQUIREMENTS (All POST SIZES)

Reference: Table 4 of the American Wood Council Prescriptive Wood Deck Construction

Bea

m S

pan

Jo

ist S

pan

Post Heights1 Footing Sizes2

D

oug

Fir-

Lar

ch3

Hem

-Fir

3, W

este

rn C

edar

Rou

nd F

ootin

g D

iam

eter

Squa

re F

ootin

g

Foot

ing

Thi

ckne

ss4

6’

≤ 10’ 14’ 14’ 18” 16”x16” 7” ≤ 14’ 14’ 14’ 21” 18”x18” 8” ≤ 18’ 14’ 12’ 24” 21”x21” 10”

8’

≤ 10’ 14’ 14’ 20” 18”x18” 8” ≤ 14’ 14’ 14’ 24” 21”x21” 10” ≤ 18’ 13’ 11’ 27” 24”x24” 11”

10’

≤ 10’ 14’ 14’ 23” 20”x20” 9” ≤ 14’ 13’ 11’ 27” 24”x24” 11” ≤ 18’ 11’ 8’ 31” 27”x27” 13”

12’

≤ 10’ 14’ 12’ 25” 22”x22” 10” ≤ 14’ 12’ 9’ 30” 26”x26” 13” ≤ 18’ 9’ 6’ 34” 30”x30” 15”

14’

≤ 10’ 13’ 11’ 27” 24”x24” 11” ≤ 14’ 10’ 7’ 32” 29”x29” 14” ≤ 18’ 8’ 2’ 37” 33”x33” 16”

1 Assumes 40 psf Live load, 10 psf dead load, No 2, stress grade and wet services conditions. 2 Assumes 1,500 psf soil bearing capacity and 150 pcf concrete. 3 Incising assumed for Douglas Fir-larch & Hem-fir. 4 Assume 2,500 psi compressive strength of concrete. Coordinate footing thickness with post base and anchor requirements. • Deck footings closer than 5 feet to an exterior house foundation wall must bear at the same

elevation as the footing of the house foundation. • Do not construct footing over septic systems, drainfields or utility lines. • Pre-manufactured post anchors shall be galvanized or stainless steel.

DECK JOIST AND BEAM SPANS D

a No. 2 grade with wet service factor. b Ground snow load, live load=40 lb c Ground snow load, live load=40 lb d Includes incising factor. f Cantilevered span not exceeding the nominal depth of the joist are permitted.

MAXIMUM JOIST SPACING- Table R507.4 MATERIAL TYPE AND NOMINAL SIZE

MAXIMUM ON-CENTER JOIST SPACING Perpendicular to joist Diagonal to joista

1 ¼ - inch-thick wood 16 inches 12 inches 2-inch-thick wood 24 inches 16 inches Plastic composite In accordance with Section R507.3 In accordance with Section R507.3 a Maximum angle of 45 degrees from perpendicular for wood deck boards.

DECK JOIST SPANS FOR COMMON LUMBER SPECIESf (ft.- in.) Table R507.5

SPECIESa

SIZE

SPACING OF DECK JOISTS WITH NO CANTILEVERb (inches)

SPACING OF DECK JOIST WITH CANTILEVERSc (inches)

12 16 24 12 16 24 Douglas Fir-larchd, hem-fird

2 X 6 9-6 8-8 7-2 6-3 6-3 6-3 2 X 8 12-6 11-1 9-1 9-5 9-5 9-1 2 X 10 15-8 13-7 11-1 13-7 13-7 11-1 2 X 12 18-0 15-9 12-00 15-9 15-9 12-10

Redwood, western cedars

2 X 6 8-10 8-0 7-0 5-7 5-7 5-7 2 X 8 11-8 10-7 8-8 8-6 8-6 8-6 2 X 10 14-11 13-0 10-7 12-3 12-3 10-7 2 X 12 17-5 15-1 12-4 16-5 15-1 12-4

DECK BEAM SPAN LENGTHS a b (ft. - in.)- Table R507.6

SPECIESc

SIZEd DECK JOIST SPAN LESS THAN OR

EQUAL TO: (feet)

6 8 10 12 14 16 18

DOUGLASe FIR-LARCHe, HEM FIRe, REDWOOD, WESTERN

CEDAR

3 x 6 or 2-2 x 6 5-5 4-8 4-2 3-10 3-6 3-1 2-9 3 x 8 or 2-2 x 8 6-10 5-11 5-4 4-10 4-6 4-1 3-8

3 x 10 or 2-2 x 10 8-4 7-3 6-6 5-11 5-6 5-1 4-8 3 x 12 or 2-2 x 12 9-8 8-5 7-6 6-10 6-4 5-11 5-7

4 x 6 6-5 5-6 4-11 4-6 4-2 3-11 3-8 4 x 8 8-5 7-3 6-6 5-11 5-6 5-2 4-10 4 x 10 9-11 8-7 7-8 7-0 6-6 6-1 5-8 4 x 12 11-5 9-11 8-10 8-1 7-6 7-0 6-7

3- 2 x 6 7-4 6-8 6-0 5-6 5-1 4-9 4-6 3- 2 x 8 9-8 8-6 7-7 6-11 6-5 6-0 5-8 3- 2 x 10 12-0 10-5 9-4 8-6 7-10 7-4 6-11 3- 2 x 12 13-11 12-1 10-9 9-10 9-1 8-6 8.1

a Ground snow load, live load= 40 psf, dead load= 10 psf b Beams supporting deck joists from one side only. c No. 2 grade, wet service factor d Beam depth shall be greater than or equal to depth of joist with a flush beam condition. e Includes incising factor.

Typical Handrail Elevation- IRC Section 311.7.8

Type 1 Handrails- IRC Section 311.7.8.3

Type II Handrails- IRC Section 311.7.8.3

This guard illustration shows both open and solid guards

Guards shall be structurally designed to comply with IRC Table R301.5

SAFETY GLAZING: Glazing where the bottom exposed edge of the glazing is less than 36 inches above the plane of the adjacent walking surface of stairways, landings between flights of stairs and ramps shall be considered a hazardous location. [IRC R308.4.6] Glazing adjacent to the landing at the bottom of a stairway where the glazing is less than 36 inches above the landing and within a 60 inch arc measured from the bottom tread shall be considered a hazardous location. [IRC R308.4.7]

GUARD ELEVATION- IRC Section 312

Deck plans must include the following plan details. Drawings must include all structural details relative to your project.

EXAMPLE

EXAMPLE