GREEN DECK PLAN REVIEW RESPONSE LETTER_Building.pdfNovember 1st, 2018
To:
City of Edmonds
Engineering Division
Attn:
Eric Carter, Plans Examiner
RE:
Application# BLD20181371
New Deck - Greene Residence
6921 163rd Pl SW, Edmonds
Mr Carter,
In response to your plan review comments regarding the aforementioned project, please see the following
itemized responses.
General Comment #1:
1. "The submitted plans do not appear to have included any structural documentation. Please submit two
copies of gravity calculations for the framing members."
Response #1:
1. Deck was designed using the American Wood Council Prescriptive Residential Wood Construction
Guide based on the 2015 International Residential Code. Relevant tables for prescriptive member sizing
are attached to this response letter.
A4.00 Comment #1:
1. "The plans indicate a section view of 31A5.00, this section does not appear to have been
included on the plans. Please clarify and change on the plans. "
Response #1:
1. Tag formerly denoted as "3/A5.00" on sheet A4.00 is now changed to "1/A5.00. New information is
denoted with revision cloud and delta tag "U'
A4.00 Comment #2:
2. "The deck footing plan indicates a "TapCon Bolt Embedment". Please indicate on the
plans the size and embedment of the anchors on the plans. "
Response #2:
2 No TapCon bolt embedments into concrete proposed. Footing embedments to be CBSQ66 standoff
column bases with t/4" x 2" SDS screws. Column base cut sheet attached to this response letter.
A4.00 Comment #3:
3 "The deck framing plan indicates that a spiral staircase is intended to be installed as part
of the project, the code sections cited on the plans do not appear to be current. If you still
would like to incorporate the code section, please indicate the proper section from the
2015 International Residential Code. "
Response #3:
3 Reference Revised on plan 2/A4.00. New information is denoted with revision cloud and delta tag "1."
A5.00 Comment #1:
1. "As indicated on 21A5. 00 the deck ledger is intended to be reutilized. The details indicate
bolts, but do not specify size or spacing. Please indicate the size and spacing on the
plans. "
Response #1:
1. Existing Deck Ledger has 3/4" Lag Bolts every 24" o.c. - Additional 1/2" Diameter Lag Screws &
Washers (Min 4" - @ 12" o.c. Staggered) will be added to the existing ledger to secure it to the existing
Band Joist/Rim Board to meet Prescriptive Requirement. Note for such added to Sheet A5.0. New
information is denoted with revision cloud and delta tag "1."
•I
LARGEST TRIBUTA
RY AREA = TA4 = 38.25 S.F.
JOIST SPAN (Lj) = 7'-4"
CANTILEVER (Lj/4) = 22" MAX
POST SPACING / BEAM SPAN = < 6'-0"
4 PRESCRIPTIVE RESIDENTIAL WOOD DECK CONSTRUCTION GUIDE
Table 2. Maximum Joist Spans and Overhangs.'
Species
Size
12" I
Allowa
16" 1
le Spa
Joist Spacing
24"
'(Li)
(o.c.)
12" 16" I
24"
Allowabl Over pan
s Lo
Southern Pine
2x66
2x8
2x10
2x12
9'-11"
13'-1"
16' - 2"
18'-01-'
9'-0"
7'-7"
1'-0"
V-1"
V-3"
1'-10' 9'-8"
1'-10" 12'-0"
2'-4"
14' - 0" 1 11' - 5"
3' - 1" 1 3' - 5"
2' -10"
116'-6"i 13'-6"
4'-6" 4'-2"
1
3'-4"
Douglas Fir-
Larch, Hem -Fir,
Spruce-Pine-Fir4 t
2x66
2x8
2x10
2x12
9'-6"
12' - 6"
15' - 8"
18'-0"' _
18'-4"(
-
13' - 7"
- T
6'-10"
9' - 1"
11' - 1"
12'-10"
0'-11"
'1'-0"
1'-2"
1'- 8"
1' - 10"
2' - 2"
2' - 10"
3' - 2'
_
2' . 9"
4'-4" 3'-11"
3'-3"
Redwood,
Western Cedars,
Ponderosa Pine',
Red Pine'
2x66
2x8
2x10
2x12
8'-10"
11' - 8"
14' - 11"
17'-5"
8'-0"
10' - 7"
13' - 0"
15'-1"
6'-10"
8'- 8"
10' - 7"
12'-4"
0'-9"
0'-10"
0'-11"
V - 5" 1'- 7"
1' - 9"
2'-5" 2'- 7"
2'- 8"
3'-7" 3'-9"
3'-1"
1. Assumes 40 psf live load, 10 psf dead load, No. 2 grade, and wet service conditions.
2. Assumes L/360 deflection.
3. Maximum allowable overhang cannot exceed L/4 or'/< of actual main span. Assumes cantilever
length/180 deflection with 220 lb point load (See Figure 1A and Figure 2).
4. Incising assumed for Douglas Fir -Larch, Hem -Fir, and Spruce -Pine -Fir.
5. Design values based on northern species with no incising assumed.
6. Ledger shall be a minimum of 2x8 nominal. Joists and rim joists to which guard posts are attached shall be a
minimum of 2x8 nominal.
7. Joist length prescriptively limited to 18'-0" for footing design.
Figure 1A. Joist Span — Joists Attached at House and Bearing Over Beam.
existing wall -I
�— optional overhang — joist
x 11. - _11_ x _it_ -
rim joist I /I,,,— blocking (at overhanging
1/ 1 joists only)
beam (flush
tight bearing)
post
ledger board
Lo or U4
maximum -� ..-- joist span (L<5
overhang See Table 2
Note: Largest Joist Span as Designed = T-4"
Meets Prescriptive Requirement
American Wood Council
6 PRESCRIPTIVE RESIDENTIAL WOOD DECK CONSTRUCTION GUIDE
E___ Ei
Table 3A. Dimension Lumber Deck Beam Spans (LB)' Supporting a Single Span of Joists with or
without Overhangs.
Species
Size'
6' !
Joist Spans (L)
8' i 10'
Less Than or Equal to:
12' 14' 16'
18'
2-2x6
6'-8"
5'-8"
5'-1"
4'-7"
4'-3"
4'-0"
3'-9"
2-2x8
8'-6" 17'-4"j
6'-6"
5'-11"
5'-6"
5'-1"
4'-9"
2-2x10
10'-1"
8'-9" 1
7'-9"
7'-1"
6'-6"
6'-1"
5'-9"
Southern Pine
2-2x12
3-2x6
11,-11" 10'-4"
7'-11" i 7'-2":
9'-2"
6'-5"
8'-4"
5'-10"
7'-9"
5'-5"
7'-3"
5'-0"
6'-9"
4'-9"
3-2x8
10'-7"
9'-3"
8'-3".
T-6"
6'-11"
6'-5"
6'-1"
3-2x10
12'-9"
11'-0" 1
9'-9"
8'-9"
8'-3"
7'-8"
7'-3"
3-2x12
15'-0"
hT-0"1
11'-7"
10'-6"
9'-9"
9'-1"
8'-7"
3x6or2-2x6
5'-2"
j 4'-5"1
T-11"
3'-7"
3'-3"
2'-10"
2'-6"
3x8or2-2x8
6'-7"
:5'-8"'
5'-1"
4'-7"
4'-3"
3'-10"
3'-5"
Douglas Fir-
3x10or2-2x10
8'-1"
7'-0"I
6'-3"
5'-8"
5'-3"
4'-10"
4'-5"
Larch 2, Hem-
Fire, Spruce-
2,
3x12 or 2-2x12
4x6
9' - 5"
6-2
8'- 2-F
,�
5'-3"4-8
7' - 3"
6'- 7"
4-3
6' - 1"
3-11
5' - 8"
3-8 ��
5'- 4"
„
3-5
Pine-Fir
Redwood,
4x8
8'- 2"
T - 0"
6'- 3"
5' - 8"
5' - 3"
4'- 11"
4'- 7"
Western
4x10
9'-8"
:8'-4"'.
T-5"
6'-9"
6'-3"
5'-10"
5'-5"
Cedars,
Ponderosa
Pine Red
,
Pine
4x12
-
3-2x8
11'-2"
- "
9'-5"
i 9'-8":
8'-3"
8'-7"
5'-9"
7'-4"
7'-10"
5'-3"
6'-8"
7'-3"
4'-10"
6'-2"
6'-9"
4'-6"
5'-9"
6'-4"
4'-3"
5'-5"
3-2x10
11'-9"
-
9'-1"
8'-3"
7'-7"
7'-1"
6'-8"
3-2x12
13'-8" 11'-10"
10'-6"
9'-7"
8'-10"
8'-3"
7'-10"
1. Assumes 40 psf live load, 10 psf dead load, U360 simple span beam deflection limit, cantilever length/180 deflection limit, No. 2 grade,
and wet service conditions.
2. Incising assumed for Douglas Fir -Larch, Hem -Fir, and Spruce -Pine -Fir.
3. Design values based on northern species with no incising assumed.
4. Beam depth must be equal to or greater than joist depth if joist hangers are used (see Figure 6, Option 3).
Note: Deck Beam Spans less than 6 Feet and
member sized as 6x8
Meets Prescriptive Requirement
American Wood Council
12 PRESCRIPTIVE RESIDENTIAL WOOD DECK CONSTRUCTION GUIDE
Table 4. Post Height for 6x65 and Footing Sizes for all Posts.
Post
Heights'
Footing
Sizes'
C
JU_
(
J
R
Y
g
co
o
LL
s�
!—
d
o
n
LL V
m
�
L
d
-Cp ao
p
a�
:510' 1
14'
14'
14'
14'
14'
! 18" !
16"x16"
7"
6'
- <_T4"`�P_..14;---
14'
14'
14'
18"x 18"
8"
<_18'
14'
14'
12'
14'
11'
24"
21"x21"
10"
<_10'
14'
14'
14'
14'
14'
20"
18"x18"
8"
8'
:514'
14'
14'
1 14'
14'
11'
24"
21 "x21 "
10"
518'
14'
13'
11'
12'
8'
27"
24"x24"
ill,
:510'
14'
14'
14'
14'
12'
23"
20"x20"
9"
10'
:514'
14'
13'
11'
13'
8'
27"
24"x24"
11"
:518'
12'
11'
8'
1 11'
2'
1 31"
27"x27"
13"
:510'
14'
14'
12'
14'
10'
25"
22"x22"
10"
12'
:514'
13'
12'
9'
11'
5'
30"
26"x26"
13"
:518'
11'
9'
6'
9'
2'
34"
30"x30"
15"
:510'
14'
13'
11'
13'
8'
27"
24"x24"
11"
14'
:514'
11'
10,
7'
10,
2'
32"
29"x29"
14"
:518'
1 9'
8'
2'
1 8'
NP
37"
33"x33"
16"
510'
13'
12'
10'
1 12'
6'
29"
26"x26"
12"
16'
:514'
10'
9'
5'
9'
2'
35"
31"x31"
15"
:518'
7'
5'
2'
7'
NP
40"
35"x35"
18"
:510'
12'
11'
8'
11'
2'
31"
27"x27"
13"
18'
514'
9'
8'
2'
8'
NP
37"
33"x33"
16"
:518'
5'
2'
2'
6'
N P
42"
37"x37"
1 19"
1. Assumes 40 psf live load, 10 psf dead load, La/4 and Lj/4 overhangs, No 2. grade and wet service
conditions.
2. Assumes 1,500 psf soil bearing capacity and 150 pcf concrete. Value may be multiplied by 0.9 for
corner posts.
3. Incising assumed for Douglas Fir -Larch, Hem -Fir, and Spruce -Pine -Fir.
4. Assumes 2,500 psi compressive strength of concrete. Coordinate footing thickness with post base and
anchor requirements.
5. 8x8 nominal posts may be substituted anywhere in Table 4 to a maximum height of 14'.
Note: Deck Beams Spans less than 6 Feet and
6x6 Posts will be no taller than 6-0"
Meets Prescriptive Requirement
American Wood Council
B4 Prescriptive Residential Wood Deck Construction Guide - Appendix
Table 132 Post Heights Based',' on Tri utary Area for Center Posts.
6x6 Post He
ht ft.
4x4 Post Hei
ht ft.
(�
P
°
F-
!^1�
LL
L
a)
�
O
r
U- nJ Ij
V 1
I— I
:O�i
! ❑ !
i
CO
IO
L N
C
L
=in
a)
�
0
3
�
N
/^� �/�'^�
LL VJ
O C
L
O
m
CL
f^C_
LL
N
e
L_
U- N
CU `-
(B
OJ
❑
L
M
L N
� C
E L
2 in
a)
Q
�
�a�//��
"O
O C
—
L OL
_�
o a)
fl y
10
14
14 i
14
14
14
14
14
14
14
14
20
14
14
14
14
14
14
14
14
14
14
30
14
14
14
14
14
14
13
13
14
140
14
14
'• 14 "
14
14
14
13
14
11
11
12
50
14
14
14
11
12
10
10 1
10
60
14
14
14
14 1
14
10
11
10
9 1
10
70
14
14
14
14
14
9
10
9
8
9
80
14
14
14
14
14
9
9
8
7
8
90
14
14
14
14
14
8
9
7
7
7
100
14
14
14
14
14
8
8
7
7
7
110
14
14
14
14
14
7
8
6
6
6
120
14
14
14
14
14
7
7
6
6
6
130
14
14
14
14
13
6
7
5
6
6
140
14
14
13
14
11
6
7
5
5
5
150
14
14
13
14
10
6
6
5
5
5
160
14
14
12
13
8
6
6
5
5
5
170
14
14
11
13
6
5
6
4
4
5
180
14
14
11
12
NP
5
6
4
4
4
190
13
13
11
12
NP
5
5
4
4
4
200
13
13
10
11
NP
4
5
3
4
4
210
12
12
8
11
NP
4
5
3
3
3
220
12
11
8
10
NP
4
5
2
3
3
230
11
11
7
10
NP
4
4
2
3
2
240
10
10
6
10
NP
3
4
NP
2
2
250
10
10
5
9
NP
7 3
4
NP
1
NP
1. Assumes No 2. Stress grade and wet service conditions.
2. Incising assumed for Douglas fir -larch, hem -fir, and spruce -pine -fir.
3. Some post heights for 4x4 post sizes show a greater load carrying capacity than 6x6
post sizes since different ASTM Standards are used to develop design values for visually
graded dimension lumber vs. visually graded timbers.
4. Tributary area shall be multiplied by 1.25 at center posts with beams not spliced
(continuous).
Note- Deck Beams Spans less than 6 Feet and
6x6 Posts will be no taller than 6'-0"
Meets Prescriptive Requirement
American Wood Council
Prescriptive Residential Wood Deck Construction Guide - Appendix B5
Table B3. Footing Sizes' Based on Tributary Area for Various Soil Capacities.
Soil Bearing Capacity
1500
sf
2000 psf
2500 psf
3000 psf
(0
�_
fv
o�
O i
LL N
6 N
C E
C
o
O C
LL
U
cc
��
C
_
O C
LL -Y
U
!ov!
O �;
,�
C !_ :
� m'
o
N
"M
��-
C
N
p C
LL U
0—
U N
N
!✓
M
o
O O
LL
N �.
(�
7
0)
O O
O C
LL U
o`.
O
LL a)
6
_N
;-
O
O
LL
j
CY
N
O C
u- U
10
8
7
6
7 1
7
6
7
6
6
6
5
6
20
12
10
6
10
9
6
9
8
6
8
7
6
30
14
13
6
11
6
11
10
6
10
9
6
i40
16 _
15
6
14
13
6
13
11
6
12
10
6
50
18
16 1
7
14
6
14
13
6
13
12
6
60
20
18
8
17
15
6
16
14
6
14
13
6
70
22
19
9
19
17
7
17
15
6
15
14
6
80
23
21
9
20
18
8
18
16
7
16
15
6
90
25
22
10
21
19
8
19
17
7
17
15
6
100
26
23
11
23
20
9
20
18
8
18
16
7
110
28
25
12
24
21
10
21
19
8
19
17
7
120
29
26
12
25
22
10
22
19
9
20
18
8
130
30
27
13
26
23
11
23
20
9
21
18
8
140
31
28
13
27
24
11
24
21
10
22
19
9
150
33
29
14
28
25
12
25
22
10
22
20
9
160
34
30
15
29
25
12
25
23
10
23
20
9
170
35
31
15
30
26
13
26
23
11
24
21
10
180
36
32
16
30
27
13
27
24
11
24
22
10
190
37
33
16
31
28
13
28
25
12
25
22
10
200
38
34
17
32
29
14
28
25
12
26
23
11
210
39
35
17
33
29
14
29
26
12
26
23
11
220
40
35
18
34
30
15
30
26
13
27
24
11
230
41
36
18
35
31
15
31
27
13
28
25
12
240
42
37
19
35
31
15
31
28
13
28
25
12
250
43
38
19
36
32
16
32
28
14
29
26
12
1. Assumes 40 psf live load, 10 psf dead load, 150 pcf concrete and 2,500 psi compressive strength
of concrete. Coordinate footing thickness with post base and anchor requirements.
2. Tributary area shall be multiplied by 1.25 at center posts with beams not spliced (continuous).
Note: Largest Tributary Area on a Column is
38.25 Sq. Ft, and is assumed that soil bearing
capacity is between 2000 and 2500 P.S.F.
Round Deck footings designed as 18" Diameter
w/ (4) #4 Rebar and 2500 PSI Concrete.
Meets Prescriptive Requirement
American Wood Council
C8 Prescriptive Residential Wood Deck Construction Guide - Commentary
Post load (lbs):
z
R= 50 LJoist + L L )+ 150 B T
2 Joist Overhang Beam 1.728
or
z
R = 50(LJ°'St + L L )+ 150 'D T
2 Joist Ovcrhang Beam 6912
where: L units are in feet and B, D, and T are in inches
Square footing (in.): B = 12 R
(soil capacity)
4R
Round footing (in.): D =12
(soil capacity
(BorD)-5.5
Footing thickness (in.): T > P; T > 2
Figure C12. Footing Dimensions and Variables.
R
Note: Largest Tributary Area on a Column is
38.25 Sq. Ft, and is assumed that soil bearing
capacity is between 2000 and 2500 P.S.F.
Round Deck footings designed as 18" Diameter
w/ (4) #4 Rebar and 2500 PSI Concrete.
Meets Prescriptive Requirement
T�kln rrdR Pe%f%finn Si7AQ fnr 14inher Snil gearina Capacities.
E
C
m
C.
N
2000 psf v
2500 psf
3000 psf
�
OaiO
-a ?
��0
p
C
L
3
N
C V
U.
C
'a _�
�a
O
C
d
M
U
N
C
p V
U.t
~
C
_
O 'C.
*
=0
0
O
d
M
to
C dp
6.2
LLs
~
'
<_10'
15"
13"xl 3"
6"
14"
12"x12"
6"
12"
11 "x11"
6"
6'
1 1--
16"x 16"
7"
16"
14"x 14"
6"
15"
13"x 13"
6"
<_18'
20"
18"x18"
8"
18"
16"x16"
7"
16"
15"x15"
6"
<-10,
17"
15"xl5"
6"
16"
14"x14"
6"
14"
13"x13"
6"
8'
<_14'
21 "
18"x18"
8"
18"
16"x16"
7"
17"
15"x15"
6"
9"
21"
18"x18"
8"
19"
17"x17"
7"
<_ 10'
19"
1711x 17"
7"
17"
15"x 15"
6"
16"
14"x 14"
6"
10,
:514'
22"
21"x21"
9"
20"
18"x18"
8"
19"
17"x17"
7"
:518'
26"
23x23
11
23"
21"x21"
1 9"
21"
19"x19"
8"
:510'
21 "
19"x 19"
8"
19"
17"x 17"
7"
17"
15"x 15"
6"
12'
:514'
25"
22"x22"
10"
22"
20"x20"
9"
20"
18"x18"
8"
:518,
29"
26"x26"
12"
26"
23"x23"
11 "
23"
21 "x21 "
9"
:510'
23"
21"x2l"
9"
20"
18"x18"
8"
19"
17"x17"
7"
14'
:514'
27"
24"x24"
11.1
24"
22"x22
10"
22"
20"x20"
9"
<_18'
31"
28"x28"
13"
28"
24"x24"
12
25"
22"x22"
10"
:510'
25"
22"x22"
10"
22"
19"x19"
9"
20"
18"x18"
8"
16'
:514'
29"
26"x26"
12"
26"
23"x23"
11 "
24"
21 "x21 "
10"
:518'
33"
WNW"
14"
30"
26"x26"
13"
1 27"
24"x24"
11"
:510'
26"
23"x23"
11"
23"
21"x21"
9"
21"
19"x19"
8"
18'
<_14'
31 "
28"x28"
13"
28"
24"x24"
12"
25"
22"x22"
10"
518'
36"
32"x32"
16"
31"
28"x28"
13"
28"
25"x25"
12"
American Wood Council
14 PRESCRIPTIVE RESIDENTIAL WOOD DECK CONSTRUCTION GUIDE
Note: Existing Deck Ledger has 3/4" Lag Bolts
every 24" o.c. - Additional 1/2" Diameter Lag
Screws & Washers (Min 4" - @ 12" o.c.
Staggered) will be added to the existing ledger to
secure it to the existing Band Joist/Rim Board to
meet Prescriptive Requirement
Figure 14. General Attachment of Ledger Board to Band Joist or Rim Joist.
exterior sheathing
existing stud wall
existing 2x band joist
or 1" minimum
EWP rim joist
2x floor joist,
wood 1-joist,
or MPCWT
existing
wall
2" min.
1-5/8" min
5' max.
2" min.
remove siding at ledger
prior to installation
threshold carefully flashed and
caulked to prevent water intrusion
ledger and joist flush on top
continuous flashing
extending past joist
hanger
deck joist
1/2" diameter lag
screws or
through -bolts with
washers
joist hanger
2x ledger board; must be greater
than or equal to the depth of the
deck joist and no greater than the
depth of the house band or rim joist
American Wood Council