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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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Prescriptive Deck
Details
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of
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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