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6/11/2019
Single Family Residential Uncovered Decks and Porches
How to Use this GuideCheck with your jurisdiction regarding type of submittal (paper or electronic) and for additionalrequirements. 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 npage 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 ofBuilding Safety for additional requirements.
1
Building GuideColorado Chapter of the International Code Council
6/11/2019
Single Family Residential Uncovered Decks and PorchesNote: A plot plan (plan view) showing the dimensions of your project or additions and its relationships to existing buildings orstructures on the property must be included. In addition to project dimensions, your plot plan must also show other details such aspost locations and spacing, joist and beam spans, and any other pertinent information not shown on the section drawing.
Si te Pl a n E x a m p l e131.0
This handout was developed by
th the International Code Councilausnder 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
Addit ion
26.0
Concrete Slab for Garage
One
Story
Frame
75.0
5’U
tilit
y
Easm
ent
75.0
Hom
eto
wn
Str
eet
1”=20’Note: Dimensions
are for reference
purposes only5.5 2
5.5
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 windows may be required Decking Light
36” Min.
Stairs
x
x
Joists
Show post and
pier size
Door to interior Electrical outlet
xxx
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)
Directions1. Fill in the blanks. Please print legibly.
2. Indicate in the check box which detail from page 6will 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
b
elow
fros
t dep
th
chec
k wi
th y
our
juris
dict
ion
36 in
ches
min.
6 Ft
. 8 in
. min.
(see
not
e)
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 DETAILSless
30 23 18 15 13 11 10
36 36 34 29 24 21 19
36 36 29 24 21 18 16
1/2 -inch diameter bolt with 1/2 maximum
sheathing
1/2-inch diameter bolt with I-inch maximum
sheathing
JOIST SPAN
On-center spacing of fasteners
1/2 -inch diameter lag screw with 1/2 -inch
maximum sheathing
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 betterSIZE
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 center2x6 9-11 9-0 7-7 1-3 1-4 1-62x8 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 CANTILEVER
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 hangerApproved 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
bel
ow fr
ost d
epth
chec
k wi
th y
our
juris
dict
ion
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”13/4”
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, andless than 11”.
8. Composite materials (example:Trex) may require 4or more stringers
Handrail (see details below)
34-38” above nosings
Guardrail required ifmore 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” - 23/4” 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.
(E) Broomfield Municipal Code: Section R308.4.6 is amended to read as follows:
R308.4.6 Glazing adjacent to stairs and ramps: Glazing where the bottom exposed edge of the glazing is less than 60 inches (1524 mm) above the plane of the adjacent walking surface of stairways, landings between flights of stairs and ramps shall be considered a hazardous location.
EXCEPTIONS:
1. When a rail is installed on the accessible side(s) of the glazing 34 to 38 inches (864 to 965 mm)above the walking surface and the plane of glass is more than 18 inches (457 mm) horizontally from the rail. The rail shall be capable of withstanding a horizontal load of 50 pounds per linear foot (730 N/m) without contacting the glass and be a minimum of 1½ inches (38 mm) in cross sectional height.
2. Glazing 36 inches (914 mm) or more measured horizontally from the walking surface.(F)
Section R308.4.7 is amended to read as follows:
R308.4.7 Glazing adjacent to the bottom stair landing: Glazing adjacent to the landing at the bottom of a stairway where the glazing is less than 60 inches (1524 mm) above the landing and within a 60 inch (1524 mm) horizontal arc less than 180 degrees the bottom tread shall be considered a hazardous location.
EXCEPTION: The glazing is protected by a guard complying with Section R312 and the plane of glass is more than 18 inches (457 mm) from the guard.
CITY & COUNTY OF BROOMFIELD RESIDENTIAL DECK PLAN REVIEW & PERMIT CONDITIONS
1. It is the owner’s responsibility to obtain any Homeowner’s Association and/or Architectural ControlCommittee approvals that may be applicable.
2. Deck ledgers shall be properly anchored to the house wall studs or to the rim joist by through bolts withnuts and washers or by compliant lag screws. See “Building Guide” for details of required flashing at the ledger. Masonry veneer, manufactured stone, and cantilevered floors are not suitable for deck support.Connecting a deck to a cantilever shall require stamped engineered plans.
3. Laminated wood beams shall be protected from the weather unless tested for exposure.
4. Deck joists are to have compliant joist hangers and compliant fasteners at the ledger and rim joists. Usenails designed for the purpose. Do not use roofing nails, screws, etc.
5. Connectors such as hangers, caps, bases, and all fasteners shall be hot-dipped galvanized for usewith pressure treated lumber.
6. Deck joists that cantilever more than 10 inches over beams shall have solid blocking at the support and afull depth rim joist at the ends. Hangers at ledger shall provide the required uplift resistance. Cantilevered deck joists more than 5 feet above grade shall be attached to the beam with hurricane clips or straps to resist wind uplift.
7. Deck posts are to be mechanically anchored to the caissons and to the beam above. Use post caps,strapping, or brackets designed for this purpose.
8. The framing system shall be inspected prior to concealment. All joists and beams shall have 1½ inches offull bearing. Call for a rough frame inspection prior to decking for all decks less than 5 feet above grade.
9. Each basement is required to have at least one emergency escape and rescue opening directly to anexterior yard. If an existing sleeping room or basement has its only emergency escape/rescue window or door located below the proposed new deck, the deck shall not cover or obstruct the required window well opening. A grate or cover is permitted provided that it is openable from the inside without the use of a key, or any special knowledge or force more than required for the window. A ladder may be required if the deck increases the effective depth of the window well to more than 44 inches.
10. Glazing closer than 5 feet from stairs and landings shall comply with IRC Section R308; safety glazingmay be required.
11. A solid, level landing that is at least as wide as the steps, but not less than 36” x 36” shall be provided atthe bottom of the steps. Landings may slope a maximum of ¼ inch per foot. Complying handrails are required when there are 4 or more risers. See attached “Building Guide” for stair requirements.
12. Composite decking material shall have a valid evaluation report, and installation shall comply withmanufacturer’s requirements.
13. New or additional deck areas shall be provided with at least one receptacle outlet located within theperimeter of the deck or porch, not more than 6 ½ feet above the floor.
14. Deck has been reviewed to meet the minimum requirements of the IRC, and has not been reviewed forany additional loads imposed by planters, hot tubs, etc. Please refer to the attached “Building Guide” for decks for additional information.
TABLE R507.3.1 MINIMUM FOOTING SIZE FOR DECKS
LOA BEARING VALUE OF- SOILS SOIL BEARING CAPACITY ® (pst)
LIVEOR TRIBUTARY 1500° 2000° ~ 3000° GROUND AREA Side of Diameter Side of Diameter Diameter Side of Diameter
Gide of SNOW a of a Thickness! a of a Thickness! of 7iekness a of a LOAD round round
aseq are around round 7
(sq. ft.) square square footing square
(psf) footing footing (inches) footing footing (inches) footing (inehes) footing footing (inehes) (inches) (inches) (inches) (inches) (inehes) (inches) (inches)
5 7 ~ 6 7 ~ 6 7 ~ 20 +? 10 1412 6 129 +4 10 6 12 44 6 +27 148 40 14 16 6 12 14 6 12 44 6 +2 10 14 12
60 17 19 6 15 17 6 18 15 6 12 14
40 80 20 22 7 17 19 6 15 ~ 6 14 16
100 22 25 8 19 21 6 ~ 49 6 15 17
120 24 27 9 21 23 7 49 21 6 17 19
140 26 29 10 22 25 8 20 23 7 18 21
160 28 31 11 24 27 9 2t 24 8 20 22
5 7 ~ 6 7 ~ 6 7 ~ 20 +2 11 14_13 6 +2 10 14 _11 6 12 -44 6 +2 8 14 _9
40 15 17 6 13 15 6 42 14 6 +2 _11 14 13 60 19 21 6 16 18 6 f-4 -16 6 13 15
50 80 21 24 8 19 21 6 ~ 49 6 15 17
100 24 27 9 21 23 7 19 2t G 17 19
120 26 30 10 23 26 8 20 23 7 19 21
140 28 32 11 25 28 9 22 25 8 20 23
160 30 34 12 26 30 10 24 27 9 21 24
5 7 ~ 6 7 ~ 6 7 ~ 20 12 14 6 +2 11 14 12 6 42 f4, 6 +2 g 14 10 40 16 19 6 14 16 6 43 { 6 12 14
60 20 23 7 17 20 6 46 48 6 14 16
60 80 23 26 9 20 23 7 18 20 6 16 19
100 26 29 10 22 25 8 20 23 7 18 21
120 28 32 11 25 28 9 22 25 8 20 23
140 31 35 12 27 30 10 24 27 9 22 24
160 33 37 13 28 32 11 25 29 10 23 26
5 7 ~ 6 7 ~ 6 7 ~ 20 12 14 6 +2 11 14 _13 6 12 {4 6 +2 9 14_10
40 18 20 6 15 17 6 {4 15 6 12 14
60 21 24 8 19 21 6 ~ 49 6 15 17
70 80 25 28 9 21 24 8 1 9 22 7 18 20
100 28 31 11 24 27 9 21 24 9 20 22
120 30 34 12 26 30 10 24 27 9 21 24
140 33 37 13 28 32 11 26 29 40 23 26
160 35 40 15 30 34 12 27 31 4 f 25 28
4] I »]
For SI: 1 inch = 25.4 mm, 1 square foot = 0.0929 m?, 1 pound per square foot = 0.0479 kPa.
2019 ICC PUBLIC COMMENT AGENDA Page 870
RB187-19 RC: R403.1.4, R403.1.4.1, R507.3, R507.3.2, R507.3.3(New)
Proponent: Deck Code Coalition, Charles Bajnai (chair), North American Deck and Railing Assoc (NADRA), Retired from Chesterfield County, VA, representing Deck Code Coalition ([email protected])
2018 International Residential Code Revise as follows:
R507.3 Footings. Decks shall be supported on concrete footings or other approved structural systems designed to accommodate all loads in accordance with Section R301. Deck footings shall be sized to carry the imposed loads from the deck structure to the ground as shown in Figure R507.3. The footing depth shell be in accordance with Seetion R403.1.4,
xseptien Exceptions:
1.
2.
Footings shall not be reguired for free Free-decks consisting of joists directly supported on grade over their entire length. Footings shall not be reguired for freestanding decks that meet all of the following criteria:
2.1.
2.2. 2.3.
The joists bear directly on precast concrete pier blocks at grade without support by beams or posts, The area of the deck does not exceed 200 square feet, The walking surface is not more than 20 inches above grade at any point within 36 inches measured horizontally from the edge.
R507.3.2 Minimum depth. Deek footings shall extend below the frost line specified in Telle R304.2{1) in eeeordance with Geetion R403.1.4.1. Deck footings shall be placed not less than 12 inches below the undisturbed ground surface.
xceptioe:
1. Free standing desks that meet all ef the fellowing criteria: 1.1. The joists bear directly on precast cesrete pier blocks at grade witheut support by
beams or posts 1.2. The area of the deck does not exceed 200 square feet (18.9 ml)
1.3. The walling surface is not more than 20 inches (616 mm} above grade at any point within 36 inehes (914 mm) measured horizontally from the edge.
2. Free standing leeks need not be provided with footings that extend below the frost kine.
Add new text as follows:
R507.3.3 Frost protection. Where decks are attached to a frost protected structure, deck footings shall be protected from frost by one or more of the following methods:
1. By extending below the frost line specified in Table R301.2(1). 2. By erecting on solid rock. 3. Other approved methods of frost protection.
Revise as follows:
ICC COMMITTEE ACTION HEARINGS ::: April, 2019 RB456
R403.1.4 Minimum depth. Exterior footings shall be placed not less than 12 inches (305 mm) below the undisturbed ground surface. Where applicable, the depth of footings shall also conform to Sections R403.1.4.1 through R403.1.4.2. Deck footings shall be in accordance with Section R507.3.
R403.1.4.1 Frost protection. Except where otherwise protected from frost, foundation walls, piers and other permanent supports of buildings and structures shall be protected from frost by one or more of the following methods:
1. Extended below the frost line specified in Table R301.2.(1). 2. Constructed in accordance with Section R403.3. 3. Constructed in accordance with ASCE 32. 4. Erected on solid rock.
Footings shall not bear on frozen soil unless the frozen condition is permanent.
Exceptions:
1. Protection of free-standing accessory structures with an area of 600 square feet (56 m2) or less, of light-frame construction, with an eave height of 10 feet (3048 mm) or less shall not be required.
2. Protection of free-standing accessory structures with an area of 400 square feet (37 m2) or less, of other than light-frame construction, with an eave height of 10 feet (3048 mm) or less shall not be required.
3. Deels not supported by e dwelling need not be rovidled with footings that extend below the frost kine.
Reason: The Deck Code Coalition (DCC) is intending to clean up Chapter 4 by pointing out that deck footing details are in Section R507. Section R507 is further cleaned up by relocating exceptions of R507.3.2 into R507.3 because the exceptions are not related to footing depth but rather about when footings not required.
The DCC added a new section dealing with footings in frost prone areas by borrowing from R403.
Cost Impact: The code change proposal-will-not increase or decrease-the cost of construction The Deck Code Coalition does not anticipate any cost impact.
The text exceptions were not modified, only relocated to a more appropriate section.
The new section on frost protection was moved from Chapter 4 to Chapter 5.
Proposal# 4303
RB187-19
ICC COMMITTEE ACTION HEARINGS ::: April, 2019 RB457
Example of deck framing around house cantilever.
Example of beam framing to foundation, not to ledger.
xxx
Illustrations only
