REVIEWED BLD-BLD2021-1004+Calculations+7.18.2021_10.10.13_AM+2306724RECEIVED
Jul 21 2021
CITY OF EDMONDS
DEVELOPMENT SERVICES
DEPARTMENT
McLeod/Casselman Deck
9318 Olympic View Drive
Structural Calculations Assumptions
Beams
Per IRC Table R507.5
412 Beam — for a beam span of 8'-10" or less joist span cannot exceed 10'.
For a beam span of 9'-11" or less joist span cannot exceed 8'
For a beam span of 11'-5" or less joist span cannot exceed 6'
Joists
Per IRC Table 507.6
2x10 joists — for a spacing of 12" OC span, span of 10' or less for the deck conforms
7/16/2021
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CHAPTER 5 FLOORS, 2018 International Residential Code (IRC) I ICC Digital Codes
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VCAM I "-W
p�T
fjPTK*N L BEAM$OAN BEAi4spm OPTI R&d
CANTILEVERrJil4�tiEFL,.�.
DROPPED REAM FLUSH BEAM
FIGURE R507.5TYPICAL DECK JOIST SPANS
TABLE R507.5 DECK BEAM SPAN LENGTHSa, b, 9(feet - inches)
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SPECIES°
SIZEd
DECK JOIST SPAN LESS THAN OR EQUAL TO:
(feet)
6
8
10
12
14
16
18
Southern pine
1— 2 x 6
4-11
4-0
3-7
3-3
3-0
2-10
2-8
1— 2 x 8
5-11
5-1
4-7
4-2
2-10
3-7
3-5
1— 2 x 10
7-0
6-0
5-5
4-11
4-7
4-3
4-0
1— 2 x 12
8-3
7-1
6-4
5-10
5-5
5-0
4-9
2— 2 x 6
6-11
5-11
5-4
4-10
4-6
4-3
4-0
2— 2 x 8
8-9
7-7
6-9
6-2
5-9
5-4
5-0
2— 2 x 10
10-4
9-0
8-0
7-4
6-9
6-4
6-0
2— 2 x 12
12-2
10-7
9-5
8-7
8-0
7-6
7-0
3— 2 x 6
8-2
7-5
6-8
6-1
5-8
5-3
5-0
3— 2 x 8
10-10
9-6
8-6
7-9
7-2
6-8
6-4
3-2 x 10
13-0
11-3
10-0
9-2
8-6
7-11
7-6
https://codes.iccsafe.org/content/IRC2018/chapter-5-floors
65/79
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CHAPTER 5 FLOORS, 2018 International Residential Code (IRC) I ICC Digital Codes
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Douglas fir -larch',
hem -fir',
spruce -pine -fir',
redwood,
western cedars,
ponderosa pinef,
red pinef
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
8-1
6-6
7-6
6-1
7-0
5-8
6-7
4 x 12
11-5
9-11
8-10
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
g. Beam cantilevers are limited to the adjacent beam's span divided by 4
R507.5.1 Deck beam bearing.
The ends of beams shall have not less than 1 1/2 inches (38 mm) of bearing on wood or metal and not less than 3 inches
(76 mm) of bearing on concrete or masonry for the entire width of the beam. Where multiple -span beams bear on
intermediate posts, each ply must have full bearing on the post in accordance with Figures R507.5.1(1) and R507.5.1(2).
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7/16/2021 CHAPTER 5 FLOORS, 2018 International Residential Code (IRC) I ICC Digital Codes
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TABLE R507.6 DECK JOIST SPAWFql�eCOMMON LUMBER SPECIES (ft. - in.)
Title Content
ALLOWABLE JOIST
MAXIMUM CANTILEVER, f
SPANb
SIZE
SPACING OF DECK
SPACING
SPECIESa
JOISTS
OF DECK JOISTS WITH CANTILEVERS
(inches)
(inches)
12
16
24
12
16
24
2 x 6
9-11
9-0
7-7
1-3
1-4
1-6
2 x 8
13-1
11-10
9-8
2-1
2-3
2-5
Southern pine
2 x
16-2
14-0
11-5
3-4
3-6
2-10
10
2x
18-0
16-6
13-6
4-6
4-2
3-4
12
2 x 6
9-6
8-8
7-2
1-2
1-3
1-5
Douglas fir-
2 x 8
12-6
11-1
9-1
1-11
2-1
2-3
larchd,
2 x
hem-fird
10
Ell
13-7
11-1
3-1
3-5
2-9
spruce-pine-fird,
2 x
18-0
15-9
12-10
4-6
3-11
3-3
12
2 x 6
8-10
8-0
7-0
1-0
1-1
1-2
Redwood,
2 x 8
11-8
10-7
8-8
1-8
1-10
2-0
western cedars,
2 x
ponderosa pine',
10
14-11
13-0
10-7
2-8
2-10
2-8
red pine'
2 x
17-5
15-1
12-4
3-10
3-9
3-1
12
R507.6.1 Deck joist bearing.
The ends of joists shall have not less than 1 1/2 inches (38 mm) of bearing on wood or
metal and not less than 3 inches (76 mm) of bearing on concrete or masonry over its
https://codes.iccsafe.org/content/IRC2018/chapter-5-floors 57/63