2012 georgia minimum residential prescriptive deck details_201401061514101938

8/16/2019 2012 Georgia Minimum Residential Prescriptive Deck Details_201401061514101938

1/22

eorgi

mendments

Prescriptive Deck

Details

Based

on the 2 12 nternational Residential

Code

This

design document applies

to

single-span single-level residential decks only

Decks must

be

constructed

in

conformance with

the details

contained herein.

A

copy

of

this

deck

detail must

be on the job

site

and

available

to the

inspector

during

each

required inspection.

Georgia

Amendments

Prescriptive eck

Details Sheet

1 of 2


2/22


3/22

G N R L REQUIREMENTS

1. Lumber shal l be natural ly durable wood or shal l be southern pine, grade 2 or better that is pressure-

preservative-treated

in

acco r dan ce

with

A W P A

l for the

species, product, preservative

and end

use.

Field cut ends, notches and dr i l led holes o f preservative treated w ood sh all be treated in the field in

accordance with

A W P A M 4.

Preservative-

treated

lumber

in

contact with

th e

ground shal l

be

rated

as

ground-contact.

Please note: not all

treated lumber

is rated for ground contact.

2. W ood-p las t i c compos i tes are composed o f bound wood and plast ic f ibers creating

mater ia l

that

can be

used

as decking and guard elements as

permitted

herein. Permissible wood-plastic composites must

bear a labe l indicat ing i ts perform ance

criteria

and compl iance

with ASTM

D 7032 .

3. Nai ls sha ll be r ing-shanked or annu lar groo ved .

4. Screws and nai ls shal l be hot-dipped galvanized, stainless steel or app r oved for use

with

pressure

treated lumber.

5.

Hardware ,

e.g., joist hangers, cas t - in-p lace post anchors, m echanical fasteners, shal l

be

galvanized

with 1.85 oz/sf o f zinc (G-185 coating) or sha l l be stainless steel. Use products such as Zmax from

Simpson Strong-Tie or Triple

Zinc

and Gold Coat from USP.

6.

Electrical

receptacles

for

decks

shall

comply

with

the

currently

approved

edition

of the National

Electr ical Code.

7.

Lighting

fo r decks and

exterior

sta i rs sh al l comply with IR C 303 .7 S ta i rway Illumination.

8. Decks constructed in acco r dan ce

with

these detai ls are not app r oved for pr ivacy screens,

planters,

built-in

seating or hot tub installations.

DECKING

pprove Material

W o o d

and

wood-plast ic composi te decking shal l

b e

installed

in

accordance with

the

requirements below.

•

Dimensions shal l

be 2x6 or

5

/4

( five-

quarter ) fo r w o o d and per m anufactu re r fo r

wood-p las ti c com pos i tes .

• W ood decking m ay be p laced at an angle of

45

to 90

degrees

to the joists.

• At tach woo d decking in acco r dan ce

with

FIGURE

1.

Placement

and

at tachment

o f

wood-plast ic

composi tes sh al l be per

manufacturer's

instructions.

wood 2x6 or 5/.

( five quarter )

board

(2)8d nails

or

(2)#3

screws at each joist

FIGURE 1: TYPICAL DECKING

• W ood -plast ic compo si te label and manufacturer 's

instructions

must be left on the jobsite fo r

inspector verification.

Plastic

Deck/no

Plastic or PVC decking, not considered a wood -plas t ic comp osi te, may be substi tuted only when the

product

has a

valid evaluation report from

an accredited

listing agency

and is

capable

of

resisting

a

live

load of 40 PSF.

Installation

shall be in con fo rmance to the evaluation

report

and the manufacturer 's

installation instructions which must be ava i lab le to the inspector . -

Georgia Amendments Prescriptive Deck Details

Sheet 3 of


4/22

O STS

Jo is ts

s h a d be des igned in acco r dance with the requi rements below.

• Joist

s p a n

is measured between th e center l ine o f bear ing a t each end o f the joist a nd does no t

inc lude th e over hangs .

• See FIGURE 2

through

FIGURE 4 for joist span

types.

• U se TABLE 1 to de ter mine your joist s ize b a s e d o n s p a n

length

a nd sp a c ing .

• The

maximum

over hang is eq u a l to

one-fourth

of the length of the joist span (0 .25 x joist s p a n ) .

• At tach rim joist to end of joists a s s h o w n in FIGURE 2 and FIGURE 4 .

joist to

ends

of

each

joist

with (3) #10

x 3 w o o d

screws

or (3)

10d nails

optional overhang existing

house wa l l

—

A1- — rim joist

beam

»-

overhang 1

1

joist

hanger- —

*-J

Voist

ledger board

—

-*

—

pos t

_̂̂ -

L_

joist

span

\

FIGURE 2: JOIST SPAN WIT OVERHANG DECK ATTACHED AT HOUSE

existing

house

wa l l -

beam

post—*

beyond

FIGURE 3: JOIST SPAN JOISTS ATTACHED TO SIDE OF BEAM

2x blocking between joists; attach —

with

(3)

10d

toe

nails each side

\r

^r

- r —

. „ „

, . . . ,

to

ends

of

each

#10 x 3 wood

screws or (3)

10d nails

__J—_

J*,-.

\K

7f^»

— rim

joist

beam-

»-

optional

\ —

-̂joist

— •

— post

joist

span

-^

i

n

—

—

pos1_____

optional

' overhang1

overhang1

--,

y

-^— existing

house

wall

FIGURE

4:

JOIST

SPAN - FREE-STANDING DECK2

1

The

maximum length

of the overhang is

equal

to

one-fourth

of the

joist

span

length (0.25

x

joist

span).

2 For more information on Free-standing Decks see Sheet 14.

Georgia Amendments Prescriptive eck

etails

Sheet 4 of 2


5/22

TABLE 1; MAXIMUM JOIST

SPAN LENGTH1

oisjs without Overhangs oists with Overhangs

Joist Spacing-^

Joist Size4-

2x8

2x10

2x12

12

13'-8

17'-5

18'-0

16

12'-5

15'-10

18'-0

24

10'-2

13T-1

15'-5

Joist Spacing-^

Joist Size4

2x8

2x10

2x12

12

10'-6

15'-2

18'-0

16

i t r 6

15'-2

IS'-O

24

10'-2

13--1

15'-5

Spans

are

based

on 40 PSF

live load,

10

PSF dead load, southern pine

2, normal

loading duration,

we t

service cond itions

an d deflections o f

A=£ /360

for main

span

an d £/180 for

overhang.

BEAMS

Beams

shall

be designed and assembled in

accordance

with the requirements

below.

• As shown in FIGURE 5,

beam

span is measured between the centerlines of two adjacent posts.

• Beam size is

determined

using TABLE 2.

•

Beams

may overhang

each

end up to one-fourth of the beam

span

(0.25 x

beam

span) as shown in

FIGURE

5.

• Using the members identified in TABLE 2, beams

shall

be assembled in accordance with FIGURE 6.

•

Beam splices shall be located over

interior

post locations

only.

joists above

~

VI

optional

^beam

-̂ —post, typical

beam span

V

IA

M

^— beam splices at interior

post locations only

beam span

optional

FIGURE 5:

BEAM

SPAN TYPES

Th e maximum length of the overhang is equal to one-fourth o f the beam span length

(0.25

x beam span) .

TABLE

2:

MAXIMUM BEAM SPAN LENGTH

Beam Size-̂

Joist Span 1̂

<

6'

> 6' -

8'

>

8'

-

10'

10' -

12'

> 12' - 14'

14'

- 16'

16'

-

18'

(2)2x6

7'-l

6 T 2

5

T

6

5'-0

4r-8

4'-4

4'-l

(2)2x8

9'-2

7'-ll

7'-l

6

r

-6

6'-0

5'-7

5'-3

(2)2x10

ll'-lO

10'-3

9'-2

8'-5

7'-9

7'-3

6'-10

(2)2x12

13'-11

12'-0

10'-9

9'-10

9'-l

8'-6

8'-0

(3)2x6

8'-7

7'-8

6'-ll

6'-3

5'-10

5'-5

5'-2

(3)2x8

ll'-4

9'-ll

8'-ll

8'-l

7'-6

7'-0

6'-7

(3)2x10

14'-5

12'-10

ll'-6

10'-6

9'-9

9'-l

8'-7

(3)2x12

17'-5

15'-1

13'-6

12'-4

ll'-5

10'-8

lO'-l

Spans are

based

on 40 PSF live

load,

10 P SF dead load, southern pine 2, normal load ing duration, w et service conditions

and deflections of A=£ /360 for main

span

an d

t/180

for overhang with a 230

Ib .

point load.

Georg ia

Amendmen t s

Prescriptive Deck

Details

Sheet 5 of


6/22

If a beam is constructed with 3-plies, attach each •

outside member to the inside as shown herein

1Q d

common

nail

or

#10 w ood screw,

staggered

in 2

rows

2 common nails or screws at each

end and at

splice ends

Note: splices are permitted in multi-span beams over interior post locations only.

FIGURE :

BEAM ASSEMBLY

DETAIL

DECK PLAN

Length to Width Ratio

For decks attached to the existing house only/ th e rat io of the overall deck length, L, to the overall deck

width/ W, must be no more than 2 to 1 as s hown in FIGURE 7. This requirement ca n also be verif ied by

ensuring L ~ W


7/22

JOIST TO BEAM CONNECTION

Each joist sha l l be a t tached to the beam a s s h o w n in FIGURE 8. Use Option 1 or Option 2 w h e n joists

bear on or overhan g pa st the beam as shown in FIGURE 2 and FIGURE 4. Use Opt ion 3 when

joists

at tach

to the s ide of the beam a s show n in FIGURE 3 ; however, th e

joist

depth

must

be

less

t han or e q u a l in

depth

to the

beam depth .

See

oist

Hangers

be low

f or information on

ha nger requ irements . Mec ha n ica l

fasteners

or

hurr icane c l ips used

in

Option

2

sha l l have

a minimum

capac i t y

of 100

Ibs.

in both

uplift

and

lateral load direct ions.

See ma nufac turer 's

instructions

fo r

minimum

insta l lat ion

requirements.

OPTION 1* OPTION 2

O PT IO N S

(3) 8d toe

naile

(2 on one

side

1 on the

other

c:

•

V y

mechanical —

fastener

or \e clip

\

V

bea

\ . . | — top of

beam

and

Joist

V

j oi s t— , must

be at

same

21

hanger elevation

£-\

n

/i=X

j

*0ption 1 is prohibited on free-standing decks

>

FIGURE 8: JOIST-TO-BEAM DETAIL

JOIST HANGERS

Joist hangers , a s sh own in FIGURE 9, sha l l h ave a minimum

capac i t y

of 600

Ibs.

fo r

2x8s,

700

Ibs.

fo r 2xlOs and 800

Ibs.

fo r 2xl2s. Th e

joist

h anger sha l l be designed a nd

manu f ac tu red for the number of plies it is carry ing.

Use

joist

hangers with

inside

flanges when c learances

to the

edge

of the beam or ledger board dictate,

Do

not use

clip

angles

or brackets to

support framing

members. Do not bend hanger flanges to accommodate

field conditions.

POSTS

Deck posts sha l l

be 6x6

with

a maximum

height

of

14'-0 measured

from the top of the footing to the underside of the b e a m . The beam

sha l l be

a t t ached

to the

post

by one of the

methods shown

in

FIGURE

11. The attachment condi t ion shown in FIGURE 10 is prohibited.

The post cap show n in FIGURE 11 , Option 2

sha l l

be specif ical ly

designed for tw o - or three-ply bea ms and 6x6 posts

with

a minimum

d o w n w a r d a l low ab le load capac i ty

of 5,000

Ibs . A ttachment sha l l

be

per

m anu fac tu rer 's instructions. Post caps sha l l

be

ga lvan i zed

per the

requirements noted on Sheet 3. 4x4 & 4x6 posts can be used if

tributary loading values are calcu lated by a design professional .

Cut

ends of

posts

shall be field

treated

with a wood

preservative containing

copper

naphthenate in accordance

with AWPA M4. Such products can be found in the paint

department of most hardware or home

center stores.

Georgia Amendments Prescriptive

Deck Details

joist hanger with inside flangesy

FIGURE

9: TYPICAL JOIST

HANGERS

FIGURE

1 :

PROHIBITED

POST TO BEAM ATTACHMENT

Sheet 7 of 2


8/22

2-ply beams

only

beam must bear

on 6x6 notch

6x6 post

post cap; attachment,

fasteners pe r manu-

facturer s instructions

(2) 2

diameter

through-bolts

with washers

3-pIy beams

must

use post cap

option

OPTION 1

notch p ost to

provide beam

with flush and

tight bearing

6x6

post

OPTION 2

FIGURE

:

POST TO BEAM

CONNECTION OPTIONS

FOOTINGS

Footings shall

be

constructed

in

accordance with

th e

requirements

below.

•

Concrete shall

be

air-entrained

and

have

a

minimum com pressive strength

of

3,000 PSI.

• Footing size and thickness

shal l

be in accordance with TABLE 3.

• See FIGURE 12 for post attachm ent options and requiremen ts.

•

Post ancho rs

shall be

galvanized

per the

requirements noted

on

Sheet

3.

•

Footings shal l bear

on

sol id ground; bearing condit ions must

be

verified

by

county inspectors prior

to

p lacement

o f

concrete.

•

Bottom

of

footing should

be at least 12

inches below grade.

•

Deck

footings c loser

than 5T - 0

to an

existing

exterior house

wall

must bear at the same

elevation

as the

existing house footings,

• Do not

construct

footings over

u l ty

lines or service pipe

Call

811 before you dig

TABLE

3:

FOOTING

SIZE

B e a m S p a n

<

8'

> 8' - 12'

> 12

r -

17'

Joist Span

10' - 14'

>14' - 18'

<

10'

>10'

- 14

Size

of

Square

15

18

21

19

22

26

23

28

Size

of

Round

17

20

23

21

24

28

25

30

M i n i m u m

Thickness

1

6

8

9

8

10

11

10

12

1The cast- in-place

post base

m ay

require

a

footing thickness greater than

the

va lue

in the

table

above. In such cases, the manufacturer's specified minimum footing

thickness

shall govern.

G eorg ia Amendments Prescriptive

Deck

Details

Sheet

S of


9/22

Notes:

1. post must be centered on footing

2. footings must bear on solid ground

y— pre-manufactured

post

base

// with cast-in-place anchor

pe r Table 3

-E

^

-E

12 diameter

concrete stem

per Table 3

roughen

concrete

joint

FIGURE

2:

TYPICAL FOOTING OPTIONS

LE GER ATTACHMENTS

Ledger boards shal l

be

attached

to the

existing

house

in

accordance

with

th e

requirements below.

•

The

depth

of a ledger

bo ard sha l l

be

greater than

or

equal

to the

depth

of the joists.

• The at tachment shal l be in acco r dance with FIGURE 14.

• The band board of the exist ing structure shal l be capab le o f suppor t ing the new deck . If this

canno t

be verified o r

cond i t ions

at the

exist ing house

differ from th e detai ls herein, then a free-

s tand ing deck

is

required.

See

Free Standing Decks

on

Sheet

14.

• Compliance

with

all

the requirements herein is critical to

ensure

the

safety

and structura

stability of your deck.

Siding

an d Flashing

Flashing shal l be instal led in accordance with th e requirements below.

• The exterior finish

i.e.

house siding must be removed prior to the installation of the

ledger board.

• Con tinuous f lashing

with a

drip edge,

as

s h o w n

in

FIGURE

14, is

required

at the

ledger board when

connected

to a

wood band board.

•

Flashing

shal l be

composed

o f

copper (attached using copper nails

only ,

sta in less steel,

U V

resistant plastic o r ga l van i zed steel coated with

1.85

oz/sf o f z inc

(G-185

coa t ing) .

• F lashing a t a door threshold shall be insta l led so as to prevent w a te r intrusion from rain or melting

i ce and snow.

Wood

I Joists

Many homes constructed with w o o d

I-joists,

as show n in FIGURE 13 , have a

1 or

thicker

engineered wood product

(EWP)

band board capab le

of

support ing a deck; se e FIGURE 14. If a minimum 1 EW P or 2x band board

is

not present, then a f ree-standing deck is required. See Free Standing

Decks on Sheet 14 for more

information.

FIGURE 13:

WOOD

I-JOIST PROFILE

Georg ia

Amendm en t s

Prescriptive eck etails Sheet 9 of 2


10/22


11/22

PROHIBITED LEDGER

ATTACHMENTS

The

ledger board attachment conditions shown

FIGURE

17 through

FIGURE

19

below

are strictly prohibited. In such

cases

the deck shall be

free-

standing.

See

FREE-STANDING DECKS

on

Sheet

14.

FIGURE

IS: BRICK VENEER

brick

veneer or

masonry

chimne

FIGURE

7:

FLOOR TRUSSES

FIGURE 9:

HOUSE

OVERHANG

LEDGER BOARD FASTENERS

Ledger board fasteners

sha l l

be

installed

in

acco rdance with

FIGURE

20 and the on

center spacing

in

TABLE 4. Only those fastener types noted herein are approved for use. A d e q u a c y of connections will be

verified by county inspectors.

2

min. sides, top —

& bottom edges

4

fasteners, each

end of ledger board

©- (

typical

spacing

NO LEAD ANCHORS

2

interior fasteners;

2

rows

staggered

1

62 min.

for 2x8

6 - 2 min. for

2x10

min. for 2x12

2

FIGURE 20: LEDGER BOARD

FASTENER

SPACING AND CLEARANCES

Addi t iona l interior fasteners are required at chimney or bay window; see FIGURE 2 1.

TABLE

4:

EDGER

BOARD

FASTENER

SPACING ON

CENTER

Fastener* *

Through Bolts

Joist

Span-D-

Band

Board* '

EW P

1

2x lum ber

S6'

24"

36

>6'-8'

18"

36"

>8'-10'

14"

34"

>10'-12'

12"

29"

>12'-14'

10"

24"

>14'-16'

9"

21"

>16'-18'

8"

19"

EW P - 1 minimum m anufac tured engineered wood product; see Sheet 9 for more nformation.

Throuah-Bolts

Through-bolts shall have a minimum diameter of

1

/

2

. Pilot holes for through-bolts shall be 17

/32

to

Vie

in

diameter. Through-bolts must be equipped

with

washers at the bolt-head and nut.

Georg ia

Amendments Prescriptive Deck Details Sheet 11 of 2


12/22

FRAMING

AT

CHIMNEY

OR BAY

WINDOW

All f raming at a ch imney or bay sha l l be constructed in acco r dance with FIGURE 21 and the

requirements

below.

•

Header size shall be equal to the joist size.

• W h e n th e chimney or bay w indo w is deeper than 3'-0 , install a 6x6 post

with

footing per the

requirements on Shee t 8 below each triple joist at the location of the header connect ion.

•

When

th e

header

is

longer than

6'-0 ,

install

6x6

posts

with footing per th e requirements on

Sheet

8

below

th e

header

to

reduce

th e

s pan

to

less than

6 '-0 .

• Post

footings

must meet th e requirements on Sheet 8.

• Joist hang ers shall be specif ical ly designed to a c c o m m o d a t e th e number of mem bers identified in

FIGURE 21,

3-ply

1

]oistr

each side

6-0 maximum

chimney

o r

bay window

E

ledger

board

chimney

or bay

window

decking may

extend 6 maximum

/—3-pIy

1

oist

-ledger

board

-2-ply

header

PLAN VIEW

2

ledger board interior

fasteners on each side of

chimney or bay window2

S T I O N

Note:

joist

hange rs shall be

sized

for the number of plies supported

FIGURE 2 : REQUIREMENTS FOR FRAMING AT CHIMNEY OR BAY WINDOW

1May be

reduced

to

2-ply

joists if joist spacing = 24 on

center,

joist span


13/22

KNEE

BRACING

place knee bracing

at all

beam post

locations

K BRACING

place k bracing in two adjacent bays

k bracing

is

prohibited

in

single

bay decks

X-BRACING

place x bracing in

alternating

bays

FIGURE 22: DIAGONAL BRACING AT BEAM-POST LOCATIONS

all decks

provide

blocking behind

joist

to align connection

KNEE

BRACING

place knee bracing at all

joist-post

locations

align oists to

accommodate

bracing

connection at post

k-bracing shall be

attached

at the

midspan

of

the

joist

align

oists to accommodate bracing

connection at post

align joists to

accommodate

bracing

connection

at

post

FIGURE 23: DIAGONAL BRACING AT JOISTS-POST LOCATIONS

free standing decks only)

bracing back of post

2

diameter through-

bolt

/ with

washer typical

-bracing front of post— 1

^bracing,

back of post

AT

BOTTOM

OF

POST

AT

POST BEAM CONNECTION

AT

JOIST

OR

BEAM

FIGURE 24: TYPICAL CONNECTIONS OF DIAGONAL

MEMBERS

G eorg ia Amendments Prescriptive

eck

Details Sheet 13 of 2


14/22

FREE STANDING DECKS

Decks

which are free-standing do not ut i l ize the exterior

wa l l

of the ex ist ing house to supp ort vert ical

loads.

Instead/

an

addit ional beam

with

posts is provided at or offset from the exist ing house; see

FIGURE

4.

When

the

edge

of the

deck foot ings

are

closer than

5'-0 to an

exist ing exter ior h ouse wall,

it

must be ar at the sam e elevat ion as the e xist ing house footings, see FIGURE 25 below. Beam size is

determined by TABLE 2.

joist

overhang

«—existing house

foundation wall

diagional

bracing

<

5'-0 ,

footings must be

at same

elevation

as

existing house footing

FIGURE 25: FREE-STANDING DECK

GU RDS

Guards/

whether required or not/ shal l be constructed in accordance

with the requirements on the procee ding pages and f igures.

Deviations

are

prohibited.

When

Required

When a deck is greater than 30 above grad e at a point 36 from th e

edge

of the

deck,

as

s h o w n

in

FIGURE

26/ a

guard

is

required.

W ood Plastic

Composites

Wood-plast ic c omposi tes of the sam e dimensions and comply ing

with

the cr i ter ia noted on Sheet 3 may be subst i tuted for the guard rai l-

cap

and

infill e lements

show n in FIGURE 27 provided the

manufacturer 's

pe rformance cr i ter ia sp ec if ical ly al low it.

edge of deck

deckfloor-i

36

grade

elevation p

CO

A

r

*\E 2

GUARD

IS REQUIRED

Guard Systems

Pre-fabr icated systems com posed of w ood , wood -plast ic composi tes or plast ic purchased from a home

center

store,

lumber com pan y or s imi lar

will

require a plan submission during the

permit

appl icat ion

process.

Only guard systems

with a

val id evaluat ion

report from an

accredi ted

listing

a gency

will be

approved for instal lat ion.

Georgia Amendments

Prescriptive

Deck

Details Sheet 14 of

2


15/22

4x 4

post,

typical

—

DO

NOT

NOTCH \

I

36

minimum

>

i-

̂

T

i

^

« fi

r™

r m

'-0

maximum spacing

cap: 2x6, 5/4 board c

anufactured

material

r approved

/—

2x2 pickets; may be placed on

/ either side

of

guard

©

(2) 5 diameter —

through-bolts and

washers

2

4

I

f

^

)

̂O

T

v \

\\

©

©

N_ openings shall

not

allow

the

passage

of a 4

diameter

sphere; wet lumber must be

spaced such that when

shrinkage occurs,

the

maximum

opening is maintained

V

>

u

9

—

2x4 top and

bottom;

may be

placed

on

/ either side of guard

post; attach

to

post

nails or (2) #8 wood

screws

attach pickets at top and

bottom with

(1 } #8

wood screw

or (2) 8d ring-shank nails with a

0.135 nominal diameter

FIGURE 7: TYPICAL

GUARD

DETAIL

do not notch

guard post

a t

deck

connection

FIGURE

8: NOTCHING

AT GUARD

POSTS

<

centerline o f —

guard post ~

^3 through-bolts

and

\s \l

^

\

f*i

^

P

cf •

£

ĉ

\-outsidejoist

or

rim joist

—

2

minimum

X

<

2 minimur

?

n

FIGURE 9: GUARD POST ATTACHMENT DETAIL

GUARD POST ATTACHMENTS

Guard posts must be a t tached in accordance with the requ irements be low.

•

Guard posts must

be

fastened

to the

f raming

in

order

to

ensure

th e

entire gua rd

can

resist

imposed loads.

•

Hold-d ow n anchors,

as

s h o wn

in

FIGURE

3 0 a nd

FIGURE

3 1,

shal l

be

used

to

attach

the

guard post

to the outside

joist

and rim

joist,

respectively.

• Ho ld-do wn anchors sha l l have an

1,800 Ib . minimum

capaci ty and shal l be ga lvan ized per the

requirements on Sheet 3 .

•

Gua rd posts

m a y b e

a t tached

to

either side

of the r im

joist

o r

outside joist.

Georgia

Amendments Prescriptive Deck Details

Sheet 15 of 2


16/22

guard-

post

at first interior bay, provide 2x

blocking at guard posts; toe nail with

10d

nails

top and

bottom, each side

hold-down

anchor, typical

outside-joist

guard

post

outside-joist

fasteners

and

attachment per

hold-down

manufacturer

blocking

PLAN VIEW

FIGURE 30:

GUARD POST TO OUTSIDE

JOIST DETAIL

guard post

hold-down

anchor

hold-down anchor

joists

align guard

post

at

joist

locations

fasteners and

attachment per

i

hold-down

manufacturer

joist

rim joist-

guard post

-rim joist

SECTION

«—rim o is t

hold-down anchor

at o ist

location between j o s t s

PLAN VIEWS

FIGURE 31: GUARD POST TO RIM JOIST DETAIL

STAIRS

Stair Geometry

Stairs

shall be a

minimum

of 36 in

width

as shown in

FIGURE 39. Tread,

r i s e r

an d

n o s i n g

d i m e n s i o n s o p e n i n g limitations a n d

t o l e r a n c e

rninimums

s h a ll

meet

th e requirements s h o w n in FIGURE 32.

Tread

Riser

aterial

T read an d

riser material

s h a l l

b e in

a c c o r d a n c e

with

t h e

requirements

b e l o w .

« Tread material s h a ll b e equivalent to d e c k i n g as specified o n

S h e e t

3.

• W o o d - p la s t ic c o m p o s i t e s m a y n o t h a ve

c a p a c i t y

fo r

stair t r e a d s

e q u a l t o

their w o o d equivalents.

• Tread material s h a l l b e at ta c h e d p e r FIGURE 35.

•

R i se rs

may be framed with

x lu m b e r

minimum or equivalent wood-plastic composite.

Georgia Amendments Prescriptive Deck

Details

Sheet 6 of 2


17/22

riser

may be open, but shall not

allow the passage of a 4 diameter

sphere

7

3/4

ma>dmum

riser;

height

shall

n ot deviate from one x

CO

stair landing required o

per R31

1.7.6

\

'

-»•

i

~~-̂ 3—

c=r~^

^=— =cr

— —3/4 -

~ nosing

shall not

deviate from

one another by m ore than 3/8

V'' -^- Vv''--a:-^V-. - i .-.- <

-

-J

FIGURE

32:

TREAD

AND

RISER DETAIL

Stair Stringers

Stringers shall be constructed in accordance with the following requirements.

• Stringers shall be continuous sawn or solid

2xl2s

meeting the stair geometry requirements shown

in FIGURE 32.

• Attach stringers

to the

deck

per

FIGURE

34 .

• Stringers shall be

spaced

at a maximum of 18 on center.

• Measured horizontally, th e maximum horizontal stringer spans shall not exceed the lengths shown

in

FIGURE

33.

• Stringers with

spans

greater than maximum

a l lowed

shal l be supported w ith 4x4 posts along their

length to create mult iple compliant spans. The 4x4 post shall be notched and bolted to the stringe

with

(2 )

V z

diameter through-bolts

with

washers

per

FIGURE

11,

Option

1. The

post shall

b e

centered on a 10 diameter or 8 square/ 4 thick footing 12 below grade and be attached per

FIGURE 12.

• Intermediate

landings

may

also

be

provided

to

shorten

th e

stringer span ;

s ee

Stair Landings

on

Sheet 18 .

maximum

unsupported span = T 0

maximum

unsupported span

= 16,-S

SAWN STRINGER

SOLID STRINGER

FIGURE

33:

ST IR STRINGER REQUIREMENTS

Georgia

Amendments

Prescriptive eck Details

Sheet

7 of 2


18/22

solid, single rim

joist or outside

joist

sloped

joist

hanger; see

Joist

angers for

more

requirements

FIGURE

34:

ST IR

STRINGER ATTACHMENT

DETAIL

attach tread material with (2)#8 screws or (2)

8d

nails per board at each stringer or ledger

tread tread

stringer

18-MAX

18 MAX.

CUT STRINGER

2x4 ledger, each side, full

depth o f tread; attach with

(4) 10d nails or (4)#8 scree ws

SOLID STRINGER

FIGURE 35: TREAD CONNECTION REQUIREMENTS

Stair

andings

A floor or landing will be required at the top and bottom of each stairway per IRC Section R311.7.6. If th

total

vertical height

of a

sta irway

exceeds

12'-0

/

then

an

intermediate

landing

will

be

required.

Intermediate stair landings shal l

be

designed

and

constructed

as a

free-standing deck using

the

details

herein.

Howe ver, for

stair landings

only, 4x4

posts

may be

used

in

lieu

of 6x6 posts fo r

heights

less

than

or

equal

to

7 ' -0 . Every landin g

shall

have

a

minimum dimension

of 36 measured in the

direction

of

travel

and not

less than

th e

width

of the

stairways served .

Georgia

Am endmen ts

Prescriptive eck etails

Sheet

IS

of


19/22

6 - 0 m a x i m u m

st ir gu rd is required for

st irs with

a

tot l

rise

more

th n

30 at a

point

36

from

the edge of the stair see

uard Requirements tot

more nform tion

st ir gu rd height —

34 measure from

nosing of

step

g u a r d p o s t -

t r i a n g u l a r o p e n i n g

s h a l l n o t

p e r m i t

th e

p a s s a g e

o f a 6

d i a m e t e r s p h e r e

- p r o v i d e b l o c k i n g b e t w e e n s t a ir

s t r i n g e r s

a t

g u a r d p o s t

locations; t o e

n a i l w i t h 1 0 d n a i l s

to p

and

b o t t o m , e a c h side

FIGURE

6:

STAIR GUARD REQUIREMENTS

Georgia Amendments

Prescriptive eck Details

Sheet

9 of


20/22


21/22

36 min. clear

1—

j?̂ all stairs and landings

N

- must be illuminated;

- . , . • s e e R303.7

handrail --

>̂

V

L

handrail

shall

return at each

en d

FIGURE

39:

MISCELLANEOUS STAIR REQUIREMENTS

Stair ighting

Sta i rways shal l be illuminated in acco rdance with IR C 303.7.

Stair Stringer ootings

Stair

stringers

at

grade shall bear

on a

concrete footing

as

shown

in

FIGURE

40. The

footings

for

each

stringer may be combined an d poured as a 1 2 deep s lab.

stringer

8

square

or

10

round, 12 deep

footing

guard-

post

stringer-

===3

a

FIGURE

4 :

STAIR STRINGER

FOOTING

Georgia Amendments

Prescriptive Deck

Details

Sheet 2

of


22/22

SAFETY

GLAZING

To reduce injury

due to an

acc iden ta l impact safety

g lazing in

w i n dow

and

door g lass

is

required when

th e

existing house wa i l enc loses any portion of the deck o r acts as a barrier to adjacent stairs landings and

th e areas at the top and bottom of the stairs. Glazing shal l be located in the affected panes of the areas

identified

be low .

• Ad jacent surface o f deck : indiv idual pa nes wh ol ly located in the

area identified

in FIGURE 41 with a

total

pane area greater

than

9 sf .

• A d jace n t

s ta i rway :

indiv idual panes partially o r whol ly located in the area shown in FIGURE 42.

glass panes wholly

within

this area and more than 9

sf must be safety glazed

FIGURE

41: SAFETY

GLAZING

AREA AT

W LKING

SURFACE

glass panes partially or-

wholly within this area

adjacent stairs must

be

safety

glazed

lower walking

surface

walking

surface

of

deck

FIGURE 42: SAFETY GLAZING AREA AT STAIRS

2012 georgia minimum residential prescriptive deck details_201401061514101938

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