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Mason County Community Services
APPLICATION REQUIREMENTS FOR
NEW OR REPLACEMENT DECKS (uncovered)
THE FOLLOWING ITEMS INCLUDED IN THIS PACKET ARE REQUIRED AT SUBMITTAL:
*Incomplete applications will not be accepted*
*Decks 30” or less from walking surface to grade (at all locations), uncovered and self-
supporting and are not at the main egress door are exempt from Building Permit process*
**Exempt decks must meet all codes including Planning regulations for shoreline
development. Shoreline permitting may be required **
1. Building Permit Application. Fill out the application completely. Use only blue or black ink. You
can locate your tax parcel number on the Mason County Assessor’s office.
https://property.co.mason.wa.us/taxsifter
2. Site Plan. Your site plan must be no larger than 11”x 17” plain white paper. It must be drawn to
scale, include all existing structures on the property and structures on either side of your
property if your property is along a shoreline. If the deck is new or expanding within a shoreline
environment such as: lake, creek, saltwater, pond, or wetland, you should contact the Planning
Department prior to application. A Planner can be reached at 360.427.9670 Ext 193. Site plan
must include location of septic tank and drainfield and include setback from deck footings to
both the tank and drainfield.
3. Construction Drawings and Details. The construction specifications on Deck Plan Specification
Sheet must be complete. All details must to complete details, code requirements can be found
in the Deck, Stair, and Landings and Guard Handout. Incomplete Permit/document will not be
accepted. https://www.co.mason.wa.us/forms/Community_Dev/deck.pdf
4. Submittal Fee’s. Building Permit fees are dependent on contractors written bid or cost of
material. You can get a quote on permit fees by contacting a Permit Specialist at
permits@co.mason.wa.us
. Amount of bid or cost must be provided to get a quote. will provide
amount due and submittal.
Contact your area Planner HERE. You can get a Planner to call you back by leaving a message at (360)
427-9670 ext. 193.
For assistance you can reach the Permit Center at: permits@co.mason.wa.us or call 360.427.9670
ext.352 for assistance.
MASON COUNTY COMMUNITY SERVICES
PERMIT ASSISTANCE CENTER:
BUILDING
PLANNING
PUBLIC HEALTH
FIRE MARSHAL
615 W. Alder Street, Shelton, WA 98584
Phone Shelton: (360)427-9670 ext. 352 • Fax: (360)427-7798 Phone
Belfair: (360)275-4467 • Phone Elma: (360)482-5269
BUILDING PERMIT APPLICATION
PROPERTY OWNER INFORMATION:
NAME:_______________________________________
MAILING ADDRESS:___________________________
CITY:_______________ STATE:______ ZIP:________
PHONE #1:____________________________________
PHONE #2:____________________________________
EMAIL:_______________________________________
PARCEL INFORMATION:
PARCEL NUMBER (12 Digit Number) _______________________________________ ZONING____________________
LEGAL DESCRIPTION (Abbreviated) _______________________________________ FIRE DISTRICT_______________
SITE ADDRESS_____________________________________________________CITY___________________________
DIRECTIONS TO SITE ADDRESS ____________________________________________________________________________
__________________________________________________________________________________________________________
IS THE PROJECT WITHIN 300 FT OF SLOPE(S) GREATER THAN 14%: YES⎕ NO ⎕ SNOW LOAD:_______psf
IS PROPERTY WITHIN 200 FT OF THE FOLLOWING: (Check all that apply):
SALTWATER ⎕ LAKE ⎕ RIVER/CREEK ⎕ POND ⎕ WETLAND ⎕ SEASONAL RUNOFF ⎕ STREAM ⎕
TYPE OF WORK: NEW ⎕ ADDITION ⎕ ALTERATION ⎕ REPAIR ⎕ OTHER ⎕_______________________
USE OF STRUCTURE (Residence, Garage, Commercial Bldg, Etc.)__________________________________________________________
IS USE: PRIMARY ⎕ SEASONAL ⎕ NUMBER OF BEDROOMS_________ NUMBER OF BATHROOMS_______
HEATED STRUCTURE? YES (Whole Bldg) ⎕ YES (Part[s] of Bldg) ⎕ NO ⎕
DESCRIBE WORK__________________________________________________________________________________________
SQUARE FOOTAGE: (proposed)
1ST FLOOR________ sq. ft. 2ND FLOOR________ sq. ft. 3RD FLOOR________ sq. ft. BASEMENT________ sq. ft.
DECK________ sq. ft. COVERED DECK________ sq. ft. STORAGE__________ sq. ft. OTHER________ sq. ft.
GARAGE________ sq. ft. Attached ⎕ Detached ⎕ CARPORT__________ sq. ft. Attached ⎕ Detached ⎕
OWNER acknowledges that submission of inaccurate information may result in a stop work order or permit revocation. Acknowledgement of such is by
signature below. I declare that I am the owner and I further declare that I am entitled to receive this permit and to do the work as proposed. I have
obtained permission from all the necessary parties, including any easement holder or parties of interest regarding this project. The owner or legal
representative, represents that the information provided is accurate and grants employees of Mason County access to the above described property
and structure(s) for review and inspection. This permit/application becomes null & void if work or authorized construction is not commenced within 180
days or if construction work is suspended for a period of 180 days.
PROOF OF CONTINUATION OF WORK ON THIS PERMIT IS BY MEANS OF INSPECTION. INACTIVITY OF THIS
PERMIT APPLICATION OF 180 DAYS OF MORE WILL CAUSE THE APPLICATION TO BE EXPIRED. (MASON
COUNTY CODE 14.08.42)
X_____________________________________________ _________________________________
Signature of OWNER (Must be signed by the OWNER) Date
MANUFACTURED HOME INFORMATION: *4 COPIES OF THE FLOOR PLAN REQUIRED*
MAKE___________________________ MODEL_______________________ YEAR______________ LENGTH_____________
WIDTH___________ BEDROOMS____________ BATHS______________ SERIAL NUMBER________________________
CONTRACTOR INFORMATION:
NAME:_________________________________________
MAILING ADDRESS:_____________________________
CITY:_______________ STATE:______ ZIP:_________
PHONE:________________ CELL: _________________
EMAIL :________________________________________
L&I REG #______________________ EXP. ___/___/___
DEPARTMENTAL REVIEW
APPROVED
D
DENIED
DATE
TAGS/NOTES/CONDITIONS
BUILDING DEPARTMENT
PLANNING DEPARTMENT
FIRE MARSHAL
Permit No:___________________
PUBLIC HEALTH
ENVIRONMENTAL HEALTH:
SEWAGE/SEWER SOURCE: SEPTIC ⎕ SEWER ⎕ / NEW ⎕ EXISTING ⎕
PLUMBING IN STRUCTURE? YES ⎕ NO ⎕ If yes, attach completed Water Adequacy Form
PERIMETER/FOUNDATION DRAINS PROPOSED? YES ⎕ NO⎕ EXISTING SQ. FT. _________________
EXISTING BEDROOMS __________ PROPOSED BEDROOMS __________ TOTAL BEDROOMS __________
PRIMARY CONTACT: OWNER ⎕ CONTRACTOR ⎕ OTHER ⎕
NAME ______________________________________________________________________ EMAIL ________________________________________________________
MAILING ADDRESS _______________________________________________________ CITY ______________________ STATE __________ ZIP____________
PHONE ______________________________________________ CELL _______________________________________________________
click to sign
signature
click to edit
www.co.mason.wa.us
MASON COUNTY DEPARTMENT OF COMMUNITY SERVICES
SITE PLAN INSTRUCTIONS
A complete, accurate, and detailed site plan is important to avoid delays in the review and approval of your pro-
ject. A sample site plan and topography are located on the inside of this form. An easy to use grid, which can
be used to draw your site plan on, is also located inside. The following items will be required, if applicable, to
complete the building permit application package. Additional information may be needed depending upon
individual site conditions. For more information see submittal standards and instructions on the back of this form.
Building Permit Application Form
Site Plan
1 1 1 1 1 1 1 1 4
Septic Records
Septic Permit Application
& Septic Design
3
Water Adequacy Form
Construction Plans
3 3 3 3 3 3
Energy Code
Application Form
If
Heated
Septic Pumpers Report
Existing systems older than 3 years.
Property Lines Flagged
Geotechnical Study
See instructions on back
3 3 3 3 3 3 3
3
Plumbing/Mechanical
Application Form
Engineered Calculations
2
2 2 2 2
2
Floor Plan
SEPA
Road Access Permit
Fire Apparatus Access Road
Small Parcel Stormwater
Application/Worksheet
Septic
Approval
Site Built
Home
Manufacture
d
Home
Man. Home
Replacement
Addition or
Remodel
Garage, Barn
or Carport
Retaining
Wall, Deck
Bulkhead or
Dock,
Demolition
of Structure
Commercial
Projects
Mechanical or
Plumbing
Re-Roof
Structure
Submittal
Requirements
The number in the table indicates the number of copies required if applicable.
Required for submittal of a complete application.
A pumpers report may be required when a septic system is existing and has been installed for three or more years. The report,
dated within the last three years, shall include the size and condition of both tank and baffles.
Additional information and permits may be required by the Planning Dept. call extension 352 for information.
If applicable, needed when site conditions require additional information.
Engineered plans shall have design information & details transferred onto plans. One copy of the plans and calculations shall be
wet-stamped. Revised 09/04/2013
SITE PLAN REQUIREMENTS:
A complete, accurate and detailed site plan is important to avoid delays in the review and approval of
your project. Use the checklist below as a tool to help you complete the site plan.
q 1. Scale: A scale of 1”=20’, is typical but other scales such as 1”=10’ or 1”-40’ are also
acceptable. Do not exceed 1”=60.
q 2. North arrow
q 3. Property line location and dimensions.
q 4. Label abutting streets
q 5. Shoreline/Surface water: Indicate creeks, streams, lakes, ponds, wetlands and
other bodies of water within 300 ft of the proposed project.
q 6. Wetlands and Seasonal Drainage: Show setback distances from wetlands or
seasonal drainage.
q 7. Easements: Indicate location and size of road, utility, and private easements.
q 8. Show All Existing Development: Identify existing and proposed structures.
Include porches, decks, roof overhangs, cantilevers, and structures that will be
demolished.
q 9. Proposed Building Footprint: Use scale to show distances to property lines,
existing structures, septic tank and drainfield. Stake or flag footprint of proposed
structure.
q 10. Sewage Disposal System: Identify septic tank location and drainfield.
q 11. Existing and proposed Buffers: Include open space, fences, sidewalks and
parking areas.
q 12. Retaining walls: Proposed and existing.
q 13. Slopes/Site contours (Topography): Identify any slopes greater than 15%, fills
or cuts greater than 4ft. that are located within 300ft. of the proposed project. Use
Contour lines or arrows to show the direction of the slope.
q 14. Wells: Show existing and proposed, need to include all wells located within 100 ft of
property.
q 15. Waterfront projects: Show all structures on adjacent property.
q 16. Driveway/ Site Access
A. Site Plan: Site plans must be drawn to scale . On at least
8 ½” x 11” paper. A checklist indicating information required on
the site plan is listed in the site plan application. Incomplete site
plans will not be accepted.
B. Construction Plans: Plans must be drawn to scale,
preferably ¼” = 1’. Dimensions must be noted on the plans. A
complete set of plans shall include foundation plan, framing
plans, floor plans, cross sections, and elevations. A complete
building plan will give the building department enough
information on how your project will be constructed. If you plan
to construct a log home, pole building greater than 864 square
feet, or a metal structure, calculations stamped by a Washington
State licensed engineer or architect, will be required. Also,
masonry or concrete structures, may require an engineered
design. The building official may require additional drawings,
details, sections, or stamped-engineered calculations and/or
details.
C. Directions to Site: Provide accurate directions to your
project site. This information will be used by staff when they
review the project and by building inspectors.
D. Structural Engineered Calculations: Will be required
if the proposed structure does not meet conventional
construction standards. Include 2 sets with your building permit
application.
E. Road Access Permit: May be required if accessing a
public road or right of way. Contact Mason County Public
Works for county maintained roads at (360) 427-9670, ext. 450
for more information. For state highways contact Washington
State Department of Transportation at (360) 874-3050.
F. Washington State Energy Code and Ventilation &
Indoor Air Quality Code (WSEC & VIAQ): Refers to
energy envelope calculations and air quality code compliance.
G. Existing On-Site Septic System: Documentation of an
approved on-site sewage system will be required. An existing
system must have records and a pumpers report, dated within
the last three years, per Mason County Health Services Policies.
These policies are case/job specific if you have any questions
please contact Environmental Health at (360) 427-9670 ext.
352.
H. Septic Approval or Sewer Permit: A Septic design
application must be approved by the Mason County
Environmental Health Department prior to permit issuance for all
single family developments using septic systems. If sewer is
available, sewer permits can be obtained by calling Mason
County Utilities at (360) 427-9670 ext. 296.
I. Water Availability: The local water purveyor must
complete a water availability application if the project will be
connected to a public water system. Private well systems
require a water well report, or capacity test, and bacteriological
test dated within the previous 12 month period.
J. Site Pre-Inspection: Resource lands and critical areas
checklist. Includes a site visit by a planner to identify critical
areas on a site.
K. Aquifer Recharge Areas: Areas where water infiltrates
the soil to the groundwater table. Call Planning Department,
extension 352.
L. Critical Area: Critical areas include shorelines, flood
plains, streams, wetlands, important wildlife habitat areas and
landslide hazard areas (such as steep slopes and marine
bluffs). The planner may need to visit your site to decide
whether a buffer zone is required between the critical area and
the proposed structures. Please mark the corners of proposed
structure(s) with flags or stakes.
M. Geotechnical Study: A geotechnical assessment or
report will be required if the parcel is located within a Landslide/
Erosion Hazard Area.
N. Wetland: Areas that are inundated or saturated by surface
water or ground water at a frequency and duration sufficient to
support, under normal circumstances, a prevalence of
vegetation typically adapted for life in saturated soil conditions.
Wetlands generally include swamps, marshes, bogs, and similar
areas.
O. Buffer: An area of land or designated for the purpose of
insulating or separating a structure or land use from a critical
area or resource land in such a manner as to reduce or mitigate
any adverse impacts of the developed area.
P. Parcel Number: a 12-digit tax assessment number
assigned to each parcel by the Assessor’s Office.
Q. Legal Description: This describes the parcel of land
identified by the 12-digit tax identification number. It is
acceptable to submit a brief legal description of the parcel as it
appears on record at the Assessor’s office. Legal descriptions
are used to check the dimensions of a parcel and any
underlying restrictions such as setbacks from property lines or
easements, lot coverage, or height of buildings.
R. Address: Site addresses are assigned through the Mason
County Department of Community Development, for more
information (360)427-9670 ext. 291.
S. Contractor Registration Number: Contractors must be
licensed with the state. The contractor license number can be
obtained from the general contractor that will be performing the
work or through the Labor & Industries website at:
www.lni.wa.gov/contractors.
An owner can be an owner-contractor when building on his or
her own property.
T. SEPA: The State Environmental Policy Act, RCW 43.21C
and implementing State and County administrative rules.
U. Fire Apparatus Access Road: Mason County
Standards require a fire apparatus access road for every facility,
building, or portion of a building that is more than 150 feet from
an existing approved access road. When the new fire apparatus
road is installed, it is to extend to within 150 feet of any portion
of the exterior walls of any building. Fire apparatus Access
Roads Ordinance and details are available. To request a copy
call (360) 427-9670 ext. 352
SUBMITTAL STANDARD INSTRUCTIONS/INFORMATION
Distances from property lines should be measured from the ‘Furthest Projection ‘
The ‘Furthest Projection’ may be an eave, gutter, land, 2nd level deck, heat pump, or propane tank.
X = distance or setback (in feet) between property line and ‘Furthest Projection’.
Contact a Permit Technician if you have questions or require clarification.
‘Furthest
Projection’
Property
Line
‘X’
Heat
Pump
House with cantilevered 2nd level,
heat pump, 2’ eave, and gutter.
In this case, the gutter would be the
‘Furthest Projection’.
Setback Instructions
Sample Site Plan and Topography
1”=40’ scale
Wetland
Stormwater
run-off path
Allowable
Building Area
95’
40’
125’
171’
80’
56’
20’
6’
114’
104’
Main Street
Sample Site Plan and Topography
Scale: 1” = 40’
DECK PLAN SPECIFICTIONS
Owners Name:__________________________________________ Permit Number:_____________
Site address:____________________________________ Parcel Number:_____________________
Submittal Requirements:
1. Building Permit Application
2. Site Plan must show all structures, septic, slopes, driveway, and shoreline.
1. Complete all items in form below. Incomplete submittal will be returned. 2018 IRC Section 507 Deck.
The Mason County Deck, stair and landing detail provides guidance.
https://www.co.mason.wa.us/forms/Community_Dev/deck.pdf
• Lumber used for construction, including ledgers, shall be of naturally durable or preservative treated
wood.
• Hardware and fasteners must be hot-dipped galvanized or stainless steel.
• The included design criteria will not support a hot tub, jacuzzi or pool.
• Decks using this design will be limited to a single joist span and a single beam span per the included
tables.
• The deck cannot be supported by a mobile or manufactured home.
DESCRIPTION EXAMPLE YOUR DECK
1. Overall Deck Size
10' wide x 12' long
1.
2. Decking Surface
Cedar or Trex
2.
3. Height Above Grade
48" at highest point
3.
A. Joist Length & Size
12' and 2"x10"
A.
B. Ledger Size
2"x10"
B.
C. Lateral Tension Device
R507.9.2(1) & R507.2(2)
2 locations x 1500 LBS or 4
locations x 750 LBS
C.
D. Spacing of Joist
16" O.C. or 24" O.C.
D.
E. Joist Overhang/ Cantilever
(Max allowed 25% of Joist
Span)
See Table 507.6
E.
F. Beam Size
6"x10
F.
G. Beam Overhang
(Max allowed 25% of beam
Span)
See Table R507.5(2)
G.
H. Post Size
6"x 6" - 10' tall
H.
I. Post Spacing
48" Center - Center
I.
J. Footing Size
Square 18"x 18" - 12” thick.
See table 507.3.1
J.
K. Ledger
½” lag Screws @ 13”
K.
SEE PAGE TWO FOR DETAIL LOCATION
K
2018 International Residential Code for single-story decks.
The 2018 International Residential Code Section R507 contains additional
information and details specific to deck construction.
Deck Footing Size Requirements
Table R507.3.1
Live or
Ground
Snow Load
(psf)
Tributary
Area
(sq. ft.)
Soil bearing Capacity
1500 psf
Side of a square
footing
(Inches)
Diameter of a round
footing
(inches)
Thickness
(Inches)
60 Live or 70
Ground Snow
Load
5
7
8
6
20
12
14
6
40
18
20
6
60
21
24
8
80
25
28
9
100
28
31
11
120
30
34
12
140
33
37
13
160
35
40
15
Typical Handrail Elevation- IRC Section 311.7.8
TABLE R507.4 DECK POST HEIGHT
Loads
b
(psf)
Post Species
c
Post
Size
d
Maximum Deck Post Height
a
(feet-inches)
Tributary Area
g,h
(sq. ft.)
20
40 60
80
100
120
140 160
60 Live
Load,
≤60
Ground
Snow
Load
Douglas Fir
e
,
Hem-fir
e
,
SPF
e
4 x 4
14-0
10-10 8-7
7-0
5-8
4-1
NP NP
4 x 6
14-0
13-10
11-1
9-5
8-2
7-3
6-4
5-4
6 x 6
14-0
14-0 14-0
14-0
14-0
13-3
10-9 6-11
8 x 8
14-0
14-0 14-0
14-0
14-0
14-0
14-0 14-0
Redwood
f
,
Western
Cedars
f
,
Ponderosa
Pine
f
,
Red Pine
f
4 x 4
14-0
10-3 7-0
NP
NP
NP
NP NP
4 x 6
14-0
13-6 10-6
8-4
5-10
NP
NP NP
6 x 6
14-0
14-0 14-0
14-0
11-11
NP
NP NP
8 x 8
14-0
14-0 14-0
14-0
14-0
14-0
14-0 14-0
For SI: 1 inch = 25.4 mm, 1 square foot = 0.0929 m
2
, 1 pound per square foot = 0.0479 kPa, NP = Not permitted.
a.
Measured from the underside of the beam to top of footing or pier.
b.
10 psf dead load. Snow load not assumed to be concurrent with live load.
c.
No. 2 grade, wet service factor included.
d.
Notched deck posts shall be sized to accommodate beam size per in accordance with Section R507.5.2.
e.
Includes incising factor.
f.
Incising factor not included.
g.
Area, in square feet, of deck surface supported by post and footing.
h.
Interpolation permitted. Extrapolation not permitted.
Deck Ledger Attachment Details & Specifications
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 R507.9.1.1)
Deck ledger shall not be supported on stone or masonry veneer.
TABLE R507.9.1.3(1)
DECK LEDGER CONNECTION TO BAND JOIST
Load
c
(psf)
Joist
Span
a
(feet)
On-Center Spacing of Fasteners
b
(inches)
1/2-inch diameter lag
screw with 1/2-inch
maximum sheathing
d,e
1/2-inch diameter bolt
with 1/2-inch maximum
sheathing
e
1/2-inch diameter bolt with
1-inch maximum sheathing
f
60 Live
Load or
70 Ground
Snow
Load
6
22 36 35
8
16 31 26
10
13 25 21
12
11 20 17
14
9
17 15
16
8
15 13
18
7
13 11
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.0479 kPa.
a.
Interpolation permitted. Extrapolation is not permitted.
b.
Ledgers shall be flashed in accordance with Section R703.4 to prevent water from contacting the house
band joist.
c.
Dead load = 10 psf. Snow load shall not be assumed to act concurrently with live load.
d.
The tip of the lag screw shall fully extend beyond the inside face of the band joist.
e.
Sheathing shall be wood structural panel or solid sawn lumber.
f.
Sheathing shall be permitted to be wood structural panel, gypsum board, fiberboard, lumber or foam
sheathing. Up to 1/2-inch thickness of stacked washers shall be permitted to substitute for up to 1/2 inch of
allowable sheathing thickness where combined with wood structural panel or lumber sheathing.
TABLE R507.9.1.3(2)
PLACEMENT OF LAG SCREWS AND BOLTS IN DECK LEDGERS AND BAND
JOISTS
Minimum End and Edge Distances and Spacing Between Rows
Top Edge
Bottom Edge
Ends
Row Spacing
Ledger
a
2 inches
d
¾ inch 2 inches
b
1 5/8 inches
b
Band Joist
c
¾ inch
2 inches
e
2 inches
b
1 5/8 inches
b
For SI: 1 inch = 25.4 mm
a.
Lag screws or bolts shall be staggered from the top to the bottom along the horizontal run of the deck
ledger in accordance with Figure R507.9.1.3(1).
b.
Maximum 5 inches.
c.
For engineered rim joists, the manufacturer’s recommendations shall govern.
d.
The minimum distance from bottom row of lag screws to the top edge of the ledger shall be in accordance
with Figure R507.9.1.3(1).
e.
The 2 inches may be reduced to ¾ inch when the band joist is directly supported by a mudsill, a header or
by double top
wall plates.
Deck Attachment for Lateral Loads
FIGURE R507.9.2(1) and FIGURE R507.9.2(2)
R507.9.2 Deck lateral load connections. Lateral loads shall be transferred to the ground or
to a structure capable of transmitting them to the ground. Where the lateral load connection is
provided in accordance with Figure R507.9.2(1), hold-down tension devices shall be installed in not
less than two locations per deck, within 24 inches of each end of the deck. Each device shall have an
allowable stress design capacity of not less than 1500 pounds (6672 N). Where the lateral load
connections are provided in accordance with Figure R507.9.2(2), the hold-down tension devices shall
be installed in not less than four locations per deck, and each device shall have an allowable stress
design capacity of not less than 750 pounds (3336 N).
Exception: Decks not more than 30 inches above grade at any point may be unattached
.
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.
TABLE R507.5(2)
MAXIMUM DECK BEAM SPAN
60 PSF LIVE LOAD c
Beam Species
d
Beam
Size
e
Deck Joist Span
a,i
(feet)
6
8
10
12
14
16
18
Maximum Beam Span
a,b,f
(feet-
inches)
Douglas fir-larch
g
,
Spruce-pine-fir
g
1-2×6
3-8
3-1
2-8
2-4
2-2
2-0
1-10
1-2×8
5-0
4-1
3-6
3-1
2-10
2-7
2-5
1-2×10
6-1
5-2
4-6
4-0
3-7
3-4
3-2
1-2×12
7-1
6-1
5-5
4-10
4-5
4-1
3-10
2-2×6
5-6
4-9
4-3
3-10
3-5
3-1
2-10
2-2×8
7-5
6-5
5-9
5-0
4-6
4-1
3-9
2-2×10
9-0
7-10
7-0
6-4
5-9
5-2
4-10
2-2×12
10-6
9-1
8-1
7-5
6-10
6-4
5-10
3-2×6
6-11
6-0
5-4
4-11
4-6
4-2
3-10
3-2×8
9-3
8-0
7-2
6-6
6-1
5-6
5-0
3-2×10
11-4
9-10
8-9
8-0
7-5
6-11
6-5
3-2×12
13-2
11-5
10-2
9-4
8-7
8-1
7-7
Redwood
h
, Western
Cedars
h
, Ponderosa
Pine
h
, Red Pine
h
1-2×6
6-9
3-2
2-9
2-5
2-2
2-0
1-11
1-2×8
4-10
4-2
3-7
3-2
2-11
2-8
2-6
1-2×10
5-10
5-1
4-6
4-1
3-8
3-5
3-3
1-2×12
6-10
5-11
5-3
4-10
4-5
4-2
3-11
2-2×6
5-7
4-10
4-4
3-11
3-6
3-2
2-11
2-2×8
7-1
6-2
5-6
5-0
4-7
4-2
3-10
2-2×10
8-8
7-6
6-9
6-2
5-8
5-4
4-11
2-2×12
10-1
8-9
7-10
7-2
6-7
6-2
5-10
3-2×6
6-8
6-1
5-5
5-0
4-7
4-3
3-11
3-2×8
8-9
7-9
6-11
6-4
5-10
5-5
5-2
3-2×10
10-11
9-5
8-5
7-8
7-2
6-8
6-3
3-2×12
12-8
10-11
9-9
8-11
8-3
7-9
7-3
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.0479 kPa, 1 pound = 0.454 kg.
a.
Interpolation permitted. Extrapolation not permitted.
b.
Beams supporting a single span of joists with or without cantilever.
c.
Dead load = 10 psf, L/Δ = 360 at main span, L/Δ = 180 at cantilever. Snow load not assumed to be concurrent with live
load.
d.
No. 2 grade, wet service factor included.
e.
Beam depth shall be equal to or greater than the depth intersecting joist for a flush beam connection.
f.
Beam cantilevers are limited to the adjacent beam's span divided by 4.
g.
Includes incising factor.
h.
Incising factor not included.
i.
Deck joist span as shown in Figure R507.5.
(a) Maximum angle of 45 degrees from perpendicular for wood deck boards.
DECKING MATERIAL TYPE AND
NOMINAL SIZE
MAXIMUM ON-CENTER SPACING
Decking perpendicular to
joist
Decking diagonal to
joist(a)
1 ¼- inch-thick wood
16 inches
12 inches
2-inch-thick wood
24 inches
16 inches
Plastic composite
In accordance with Section
R507.2
In accordance with
Section R507.2
TABLE R507.6
MAXIMUM DECK JOIST SPANS
Load
a
(psf)
Joist
Species
b
Joist
Size
Allowable Joist Span
b,c
(feet-inches)
Maximum Cantilever
f,g
(feet-inches)
Joist Spacing (inches) Adjacent Joist Back Span
g
(feet)
12 16 24
4
6
8
10 12 14 16 18
60 Live
Load or
70
Ground
Snow
Load
Douglas fir-
larch
e
,
Hem-fir
e
,
Spruce-
pine-fir
e
2×6 7-11 7-1
5-9
1-0 1-6 NP NP NP NP NP NP
2×8 10-5 9-5
7-8
1-0 1-6 2-0 2-1 NP NP NP NP
2×10 13-3 11-6
9-5
1-0 1-6 2-0 2-6 2-8 NP NP NP
2×12 15-5 13-4
10-11
1-0 1-6 2-0 2-6 3-0 3-3 NP NP
Redwood
f
,
Western
Cedars
f
,
Ponderosa
Pine
f
,
Red Pine
f
2×6 7-4 6-8
5-10
1-0 1-4 NP NP NP NP NP NP
2×8 9-8 8-10
7-4
1-0 1-6 1-11 NP NP NP NP NP
2×10 12-4 11-0
9-0
1-0 1-6 2-0 2-6 2-6 NP NP NP
2×12 14-9 12-9
10-5
1-0 1-6 2-0 2-6 3-0 3-0 NP NP
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.0479 kPa, 1 pound = 0.454 kg, NP = Not permitted.
a. Dead load = 10 psf dead load. Snow load not assumed to be concurrent with live load.
b. No. 2 grade, wet service factor included.
c. L/Δ = 360 at main span.
d. L/Δ = 180 at cantilever with 220-pound point load applied to end.
e. Includes incising factor.
f. Incising factr not included.
g. Interpolation permitted. Extrapolation not permitted.
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