6/11/2019
Single Family Residential
Uncovered Decks and Porches
How to Use this Guide
Check with your jurisdiction regarding type of submittal (paper or electronic) and for additional
requirements. Draw to scale and complete the following (hint: use graph paper with ¼” squares.
Example: ¼” = 1’).
1.Complete this Building Guide
by filling in the blanks o n
page three, and
indicating which construction details will be used.
2.Provide Plot Plan
(site plan) showing dimensions of your project or
addition
and its relationship to existing buildings or structures o n the property and
the distance to existing property lines drawn to scale. See page 2.
3. Fill out a building permit application.
The majority of permit
applications are processed
with little delay. The
submitted documents will
help determine if the
project is in compliance
with building safety codes,
zoning ordinances and
other applicable laws.
The Colorado Chapter of the International
Code Council is a professional organization
seeking to promote the public health, safety
and welfare to building construction. We
appreciate your feedback and suggestions.
please write to the Colorado chapter of the
Internationa code Council, P.O.Box 961,
Arvada, CO 80001.This building guide can
be found on Colorado Chapter of the
International Code Council website at:
http://www.coloradochaptericc.org
This handout was developed by the Colorado
Chapter of the International Code Council as a
basic plan submittal under the 2018 International
Residential Code. It is not intended to cover all
circumstances. Check with your Department of
Building Safety for additional requirements.
1
Building Guide
Colorado Chapter of the International Code Council
6/11/2019
Single Family Residential Uncovered Decks and Porches
Note: A plot plan (plan view) showing the dimensions of your project or additions and its relationships to existing buildings or
structures on the property must be included. In addition to project dimensions, your plot plan must also show other details such as
post locations and spacing, joist and beam spans, and any other pertinent information not shown on the section drawing.
Si t e Pl a n E x a m p l e
131.0
This handout was developed by
th the International Code Council
ausnder the 2018 International Residential Code. It is not
intended to cover all circumstances. Check with your
e Colorado Chapter of
a basic plan submittal
Proposed
Addition
26.0
Concrete
Slab for
Garage
One
Story
Fram
e
75.0
5’Utility
Easment
75.0
Hometown
Street
1=20
Note: Dimensions
are for reference
purposes only
5.
5
25.
5
20.
0
20.
0
9.
5
40.
0
40.
0
131.0
Plan View Example
30.0
24.2
45.8
Walkway
Concrete Drive
59.2
Tempered windows may be required Decking Light Door to interior Electrical outlet
36 Min.
Stairs
Joists
1/4”= 1
nstall dia onal br Beams
x = Show Dimension
Tempered windowsmay be required
Decking Light
36 Min.
Stairs
x
x
Joists
Show post and
pier size
Door to interior Electrical outlet
x
x
x
x
Beams
1/4 = 1
x = Show Dimension
Department of Building Safety for additional requirements.
2
Lateral bracing is required per Section R507.9.2
6/11/2019
Deck Section
Beam splices to occur over
posts with 1
1
/
2
" bearing
A
B
Detail C
(see page 6)
C
Detail B
Alternate Detail B1
Alternate Detail B2
Check one
(see page 6)
Detail A
(see page 6)
Directions
1.
Fill in the blanks. Please print legibly.
2.
Indicate in the check box which detail from page 6
will be used.
Address:
Attach decking with non corrosive fasteners
36” high guard
with balusters
spaced so that a
4 Inch diameter
sphere cannot
pass through
Existing bldg.
Note: Emergency escape windows are allowed
to be installed under decks and porches provided
the location of the deck allows the emergency
escape window to be fully opened and provides a
path not less than 36” in height to a yard or court.
6’8” required for walk out basements or patios.
Finished grade
below frost depth
check with your
jurisdiction
36 inches min.
6 Ft. 8 in. min. (see note)
Approved
flashing
required
Electrical outlet
required on decks
Conditions such as attachment
to cantilevers or veneers may
require Engineer’s approval
This handout was developed by the Colorado Chapter of the
International Code Council as a basic plan submittal under
the 2018 International Residential Code. It is not intended
to cover all circumstances. Check with your Department
of Building Safety for additional requirements.
Span
Span ____________
2x______ joists
spaced _____" apart
(example: 2 x 10" spaced 24" apart) see Table2
_____x_____ posts spaced______
apart
(example: 4 x 4 posts spaced 8' apart)
Post height _______ see Table4
(example: 13' - 4" )
Type of decking _____x_____ - ___________________
(example: 1 x 4 or 2 x 6 - Trex)
(__)______x_____beam
(example: (2) 2 x 10 - see detail B) see Table3
Size and Spacing of Lags
________________________
(example: Two rows1/2”x 4 1/2” lags @ 16” O.C.)
see Table 1
Type of exterior wall covering
(existing )
_______________________
Single Family Residential Uncovered Decks and Porches
3
6/11/2019
Single Family Residential Uncovered Decks and Porches
This handout was developed by the Colorado Chapter of the
International Code Council as a basic plan submittal under
the 2018 International Residential Code. It is not intended
to cover all circumstances. Check with your Department
of Building Safety for additional requirements.
4
Table 1 Ledger connection
Ledger minimum size 2x8 presure treated HF,
DF or SP #2 or better ;shall not be supported
by stone or masonry veneer or be attached to a
cantelivered floor
LAGSREWS AND BOLTS LOCATION IN DECK LEDGERS AND RIM JOISTS
MINIMUM END AND EDGE DISTANCES AND SPACING BETWEEN ROWS
ROW SPACING
Ledger
l -5/8 inches
Band Joist
l -5/8 inches
TOP EDGE
BOTTOM EDGE
ENDS
2 inches
3/4 inch
2 inches
3/4 inch
2 inches
2 inches
Ledger Connection to rim joist
Deck live load =40psf; Snowload =40psf; Dead load=10 psf
CONNECTION DETAILS
less
30 23
18
15 13 11 10
36 36 34 29 24 21 19
36 36 29 24 21 18 16
JOIST SPAN
On-center spacing of fasteners
This handout was developed by the Colorado Chapter of the
International Code Council as a basic plan submittal under
the 2018 International Residential Code. It is not intended
to cover all circumstances. Check with your Department of
Building Safety for additional requirements.
Table 3 - Wood Beam simple span
6/11/2019
5
Table 4 - Wood Post
Table 2 -Wood Joist simple span
Use of engineered lumber is
not covered by this guide.
Single Family Residential Uncovered Decks and Porches
Maximum Live Load or Ground Snow Load 40psf, Maximum Dead Load 10psf
deflection L/360 Main span; L/180 cantilever
6 8 10 12 14 16 18
(2)-2x8
8-9 7-7 6-9 6-2 5-9 5-4 5-0
(2)-2x10
10-4 9-0 8-0 7-4 6-9 6-4 6-0
(2)-2x12
12-2 10-7 9-5 8-7 8-0 7-6 7-0
(3)-2x8
10-10 9-8 8-6 7-9 7-2 6-8 6-4
(3)-2x10
13-0 11-3 10-0 9-2 8-6 7-11 7-6
(3)-2x12
15-3 13-3 11-10 10-9 10-0 9-4 8-10
3 x 8 or (2)- 2 x 8
6-10 5-11 5-4 4-10 4-6 4-1
3-8
3 x 10 or (2)- 2 x 10
8-4 7-5 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
4x6
6-5 5-6 4-11 4-6 4-2 3-11 3-5
4x8
8-5 7-3 6-6 5-11 5-6 5-2 4-10
4x10
9-11 8-7 7-8 7-0 6-6 6-1
5-8
4 x12
11-5 9-11 8-10 8-1 7-6 7-0 6-7
(3)-2x8
9-8 8-6 7-7 6-11 6-5 6-0 5-8
(3)-2x10
12-0 10-5 9-4 8-6 7-10 7-4 6-11
(3)-2x12
13-11 12-1 10-9 9-10 9-1 8-6 8- 1
WOOD SPECIES
grade #2 or better
SIZE
DECK JOIST SPAN (ft-in)LESS THAN OR EQUAL TO:
(feet)
Southern pine
Douglas fir-larch,
hem-fir,
spruce-pine-fir,
Maximum Live Load or Ground Snow Load 40psf, Maximum Dead Load 10psf
deflection L/360 Main span; L/180 cantilever
Simple Span
12
on center
16
on center
24
on center
12
on center
16
on center
24
on center
2x6 9-11 9-0 7-7 1-3 1-4 1-6
2x8 13-1 11-10 9-8 2-1 2-3 2-5
2x10 16-2 14-0 11-5 3-4 3-6 2-10
2x12 18-0 16-6 13-6 4-6 4-2 3-4
2x6 9-6 8-8 7-2 1-2 1-3 1-5
2x8 12-6 11-1 9-1 1-11 2-1 2-3
2x10 15-8 13-7 11-1 3-1 3-5 2-9
2x12 18-0 15-9 12-10 4-6 3-11 3-3
MAXIMUM CANTILE VER
SPACING OF DECK JOISTS
(inches)
SPACING
OF DECK JOISTS WITH CANTILEVERS
(inches)
Southern pine
Douglas fir-
larch, hem- fir,
spruce-pine-fir
WOOD
SPECIES
grade # 2 or
better
JOIST SIZE
MAXIMUM JOIST SPAN
6/11/2019
Detail A Detail B
Alternate Detail B1
Detail C
Alternate Detail B2
Non-corrosive metal joist hanger
Approved flashing
Attach ledger to existing bldg.
with non-corrosive fasteners.
Locate fasteners to penetrate
rim joist or wall studs.
Non-corrosive
metal joist
hanger
Secure posts to
beam with
through bolts
Non-corrosive
metal post/beam
connector
Secure posts
to beam with
through bolts
Non-corrosive metal
post/beam connector
1/4 of joist span
Secure posts to beam
with through bolts
Non-corrosive metal
post/beam connector
2x solid blocking shall be 60%
or more of joist depth
1
/
2
" (min.) diameter anchor bolt
embedded 7" min. into concrete pier
or the equivalent
8" (min.) diameter pier
6" min. If less than 6", post must be decay resistive
Non-corrosive metal post anchor
Conditions such as attachment to cantilevers or
veneers may require Engineer’s approval
Beam splices to
occur over posts
with 1
1
/
2
" bearing
Beam splices to
occur over posts
with 1
1
/
2
" bearing
Beam splices to
occur over posts
with 1
1
/
2
" bearing
Attach to joists with non-corrosive fasteners
Existing building
Finished grade
below frost depth
check with your
jurisdiction
Approved flashing required behind existing exterior wall covering
This handout was developed by the Colorado Chapter of the
International Code Council as a basic plan submittal under
the 2018 International Residential Code. It is not intended
to cover all circumstances. Check with your Department
of Building Safety for additional requirements.
Single Family Residential Uncovered Decks and Porches
6
maxium
6/11/2019
Acceptable Handrail Details
Stair & Handrail Specifications
Unacceptable Handrails
Open risers
less than 4”
3
/
4
1
3
/
4
This handout was developed by the Colorado Chapter of the
International Code Council as a basic plan submittal under
the 2018 International Residential Code. It is not intended
to cover all circumstances. Check with your Department
of Building Safety for additional requirements.
Single Family Residential Uncovered Decks and Porches
7
Stairway Notes:
1. Stairways shall be not less than 36” in width.
2. Stairway rises shall be not greater than 7 3/4”.
3. Stairway treads shall have a minimum run of 10”.
4. The length of Run and the height of Riser shall not
vary more than 3/8” in the entire run of the stair.
5. Stairs are required to be illuminated.
6. Open risers permitted if opening is less than 4”.
7. A nosing not less than 3/4” but not more than 1 1/4”
shall be provided on stairways with solid risers, and
less than 11”.
8. Composite materials (example:Trex) may require 4
or more stringers
Handrail (see details below)
34-38” above
nosings
Guardrail required if
more than 30”
1
1
/
2
min.
1
1
/
4
- 2” Gripable
Wall or other surface
1-
1
/
2
” min.
36" min.
height
Open guardrails on decks more than 30 inches above grade or a floor below shall
have members spaced so that a 4 inch diameter sphere cannot pass through.
Guardrail
New or existing
light required
1
1
/
4
- 2
3
/
4
” max.
Openings for required
guards on the sides
of stair treads shall
not allow a 4 3/8”
diameter sphere to
pass through.
Type II Type I
Handrail Notes:
1. Handrails shall be continuous on at least one side of stairs with 4 or more risers.
2. Top of the handrails shall be placed not less than 34 inches nor more than 38 inches above stair nosings.
3.
The handgrip portion of handrails shall be not less than 1-1/4 inches nor more than 2 1/4 inches in cross section for non circular handrails.
4. Handrails shall be placed not less than 1-1/2 inches from any wall or other surface.
5.
Handrails to be returned to wall, post or safety terminal (per 311.7.8.4 IRC)
Deck
10” min. run
from nosing
to nosing
7 3/4” max. rise
36” Min.
Landing same
width as stairs
Finished grade
Less than
6” dia.