Planning Development Amp Codes 111 South Jocogov Org-Books Pdf

Planning Development amp Codes 111 South jocogov org

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for designing joists, beams, posts, deck piers and connecting the deck to the house. The stair stringers must also be cut and connected properly and must not exceed the spans specified for safety reasons.




USES AND LIMITATIONS OF THIS DOCUMENT
The purpose of this document is to provide the public contractors homeowners and city officials with deck
construction guidelines that will be accepted by the majority of jurisdictions within the Johnson County and
Kansas City metropolitan area Members of the Johnson County Building Officials have agreed that the
guidelines contained in this document provide construction principles and practices that if followed will
satisfy the general permit and construction requirements in their jurisdictions The prescriptive construction
methods recommended in this guideline meet or exceed minimum requirements of the 2009 International
Residential Code
This guideline does not contain all of the local jurisdiction requirements for obtaining permits fees or
procedures for inspection The guideline also does not prevent the local jurisdiction from asking for
additional information or varying from specific requirements based on locally adopted code and ordinance
requirements This guide is not intended to preclude the use of other construction methods and materials
which may be approved by the authority having jurisdiction Prior to beginning any new construction
additions or maintenance work on decks consult with your local jurisdiction to verify that use of this
guideline is acceptable and to familiarize yourself with their specific permit application plan review and
inspection procedures
This guideline is limited to deck designs using a uniform floor loading of 40 pounds per square foot live load
and 10 pounds per square foot dead load over the entire floor of the deck Decks supporting loads in excess of
the standard uniform loads will require specific approval from the local jurisdiction and may require design
by licensed architects or engineers Decks supporting roofs hot tubs spas sun rooms etc and decks with
cantilevers exceeding 3 feet are examples of deck design elements that are not covered by this guideline and
will require additional direction from the local jurisdiction
Where deck ledgers are attached to the dwelling the assumed attachment is over hardboard siding with
connection through to the rim joist of the house Where the exterior consists of other siding materials
stucco shingles asbestos siding etc or attachment of the ledger is to brick concrete stone or other
materials consult with your local jurisdiction for acceptable attachment methods
This is a living document and is subject to change from time to time as codes or other requirements
Second Edition September 2009
Residential Decks Permit and Construction Guidelines
Builders and homeowners are required to obtain a permit
prior to constructing altering or replacing a deck
Plan Submittals
The following information shall be submitted to the building department for their review in order to obtain a
deck permit All of the information shown on the sample documents should be contained in all plan
submittals Additional information may be necessary Plan review fees and permit fees will vary from one
jurisdiction to another
The first requirement is submittal of a Site Plan drawn to scale for the property where the deck is to be
built Please provide all the information shown on the sample
Dimension of lot
and building plan
Right of way Back of curb
All lot dimensions shall be shown on the Site Plan The distances to property lines must meet any side and
rear yard setback requirements This Site Plan may be drawn by the builder or the homeowner and does not
have to be sealed by a design professional
The second requirement in obtaining a permit is the submittal of a Deck Plan drawn to scale This plan
should contain as much information as possible about the deck and its construction The information shown
on the sample Deck Plan is the minimal requirement for the plan review process Additional information may
be required by the building department in order to complete their review This plan may also be drawn by
the builder or the homeowner and does not require the seal of a design professional Some designs and
construction methods may however require the use of an architect engineer or other design professional
2x6 Cedar decking over 2 SP
Deck Treated 2x10 s 16 o c
Figure 2 Decking 300 Concentrated Load
Member Species grade Max span
The specific construction information shown on the 2x6 SP 2 ACQ 2 6
2x6 Cedar 2 2 0
sample Deck Plan can be found in the tables and 5 4x6 SP 2 ACQ 2 0
diagrams that are provided with this document Refer 5 4x6 Cedar 2 1 4
5 4x6 Composite 1 4
to the tables for specific requirements
for designing joists beams posts deck piers and
connecting the deck to the house The stair stringers
must also be cut and connected properly and must not exceed the spans specified for safety reasons The
information contained in this document should not be considered a complete list of code requirements
A variety of decking materials may be used for the flooring and railings Please specify the size and type of
Spans for decking material
and the framing direction such as 5 4 Radius Edge Cedar Decking running at a 45 degree angle to the floor
joists This is important because certain products like Radius Edge Decking have limited span capabilities
as shown in Table 1
The deck must be constructed of either a naturally decay resistant lumber or a preservative treated lumber
and be designed to support a live load of 40 psf All overhead power lines must be located at least 10 feet
above the deck floor or be at least 3 feet horizontally away from the floor surface An exterior light for the
deck and lighting on the stairs is required
Columns and Piers
The size of the wood columns and concrete piers that are required to support a deck is based on the square
footage of deck being supported by that column and pier This square footage can be determined by using
Figure 3 as an example A column and pier supports an area of deck that is half way to the next support in
any direction The house is considered a support In Figure 3 below the interior post supports half the joist
span going back to the house and half the joist span going toward the outside edge of the deck Since each
set of joists span 8 feet the post and pier supports 4 feet of the span in each direction That means the
interior post and pier is carrying a total of 8 feet parallel to the joists
Tributary load area for posts
on corner post
We then determine the distance between posts and piers parallel to the beam Since the posts are set 10 feet
apart in this diagram the interior post and pier supports 5 feet in both directions for a total of 10 feet along
the length of the beam These two dimensions then give us an area of 80 square feet of deck
supported by the interior post The perimeter posts carry half the area the interior post carries or 40 square
feet and the corner posts carry half the area of the perimeter posts or 20 square feet Now the size of the
columns and the piers can be determined using Tables 2 and 3
Maximum post heights for 40 lb ft deck design
Table 2 on the right shows the size of post
that is required to support a specified area
of deck and the height that post may be 40 lb ft2 live load 10 lb ft2 dead load
Tributary load area to post ft2
The maximum post height is measured Species
size 3 4 6 7 8 9
1 1 1 1 1 1 1
0 2 132 4 5 6 8 9
from the top of the concrete pier to the 6 8 0 2 4 6
8 0 4 6 8 0 2
9 9 8 8 7 6 6 6 6 5
bottom of the beam the post supports 4x4 0
This same post may continue on up to 4x6
provide support for the guardrail around Southern pine
1 1 1 1 1 1 1
the deck but that additional length is not No
6x6 1 1 1 1 1 1 1 1 1 1 1 1 1
counted as part of the maximum post No 7 7 7 7 7 7 7 7 16 6 5 4 3 3
height 1 1
9 8 7 7 6 6 4
9 8 8 7 7 6 6 5
4x6 4 3 2 1 0 7
Western Red Cedar 6x6 1 1 1 1 1 1 1 1 1 1 1 1 1
No 7 7 7 7 7 7 7 7 16 5 5 4 4 3
6x6 1 1 1 1 1 1 1
No 7 7 7 7 7 6 3
To use the table simply find the square footage of deck being supported by the post and match it with the
species and size of the post to find the
maximum height of that particular column
A critical part of the deck construction is the
concrete pier that supports each post If they
are too small the deck could settle over time
and become uneven To use Table 3 select
the square footage of deck supported by the
pier This is the same area that was just used
for the post sitting on the pier Based on the
square footage being supported select the
diameter of the pier required Remember that
all piers are to be a minimum of 36 inches
deep to go below the frost line At least
1 inch of the pier should be elevated above
grade with the top sloped for drainage
Pier sizes can be chosen individually based on the square footage of deck supported by each pier That
would mean each pier might require a different diameter hole An easier way is to determine the largest
diameter hole required and make all the holes that size This method will however require more concrete
Which ever way it is done this information must be shown on the Deck Plan
Once the post and pier sizes are determined a connection must be made between the post and the pier This
connection must resist lateral movement as well as uplift That means a column anchor must be used to
attach the post to the pier A drift pin simply drilled into the bottom of the post is not sufficient Neither
is a lag screwed part way into the bottom of a post with the remainder cast into a concrete pier The sample
plan states a Simpson AB66R Post Base or equivalent is being used to anchor the post to
Pier sizes based on deck area supported
the pier Be sure to specify some type of
Square footage of deck
column anchor on the plans Column anchors are made to fit Pier diameter
that can be supported
4x4 or 6x6 posts Some column anchors are designed to be 8 14
set directly in the concrete when it is poured Others can be 12 32
drilled into the concrete later so they can be placed exactly 14 40
where they need to go after the concrete has set up Wedge 18 72
anchors are recommended for these applications 20 88
Ledger to House Connection
Decks are usually supported on one side by a
ledger attached to the house This ledger Based on 2000 psf allowable soil bearing capacity attachment is critical
to insure the deck is safely
and securely supported at this point When the ledger is attached to the house there are very specific
requirements that must be met Follow the diagrams closely for the proper attachment of the ledger
The deck ledger shall not be nailed to the house It must be lagged or bolted to the rim joist of the house
which in turn must be securely attached to the framing of the structure and sitting on the foundation wall
Use Table 4 to determine the proper attachment of the deck ledger to the rim joist of the house The house
rim joist may be either a 2x or a 1 1 4 LSL rim for I joists
Required size and spacing of corrosion resistant lag screws for attaching
deck ledger to house for a given joist span
On center spacing of lag screws inches
Lag size Joist span feet
0 5 ft 6 7 ft 8 10 ft 11 14 ft 15 18 ft
1 2 dia Lag
32 o c 24 o c 16 o c 12 o c 8 o c
Equivalent Each joist space
Every other joist Two every third Two in each joist
spacing joists Each joist space with two every
space joist space space
16 o c other space
0 4 ft 5 6 ft 7 8 ft 9 12 ft 13 18 ft
3 8 dia Lag
24 o c 16 o c 12 o c 8 o c 6 o c
Equivalent Each joist space Two each joist
Two every third Two in each joist
spacing joists Each joist space with two every space with three
joist space space
16 o c other space every other space
The size and spacing of the lag screws is based on their capacity Lag screw values are assumed to be 340
pounds for 1 2 inch lag screws and 250 pounds for 3 8 inch lag screws The span of
the floor joists determines how much load is being transferred to the ledger and thus to the lag screws Use
Table 4 by picking a lag screw size and then find the span of the floor joists Under the span will be the
required on center spacing of the lag screws Since some lag screw spacing will interfere with the framing
layout an equivalent spacing is also provided that may be used in lieu of the specified on center spacing
when the joists are laid out at 16 o c
Proprietary fasteners such as Ledgerlok or any other brand of similar fasteners may be used in lieu of
3 8 inch lag screws See Table 4 for spacing requirements
Pilot holes shall be drilled for lag screws 1 2 inch or larger The clearance hole for the shank shall have the
same diameter as the shank The lead hole for the threaded portion shall have a diameter equal to 60 to
75 of the shank diameter Pilot holes shall not be drilled for 3 8 inch or smaller lag screws All lags and
nails used to connect framing members will be placed at least 2 inches from the ends and edges of the lumber
as shown in Figure 5 Do not drive lag screws with a hammer
The use of lag screws along with all the other metal connectors used to build a deck brings us to a very
important point The use of proper fasteners and connections with treated lumber is critical to the overall
performance of the structure Standard carbon steel nails and fasteners will rust and corrode with time
causing unsightly stains and possibly an eventual failure to hold securely Therefore the lag screws or wedge
anchors supporting the ledger and all other connectors used in constructing a deck such as joist hangers and
hold downs must be hot dipped galvanized or stainless steel Electroplated fasteners are not recommended
for use with treated lumber Since ACQ and CA treated wood will corrode standard carbon steel and
aluminum it is of extreme importance that all the connectors and flashings used in deck construction be able
to withstand direct contact with these materials The new CA C treatment which is a dispersed copper or
micronized version is less corrosive than its predecessor It still requires the use of hot dipped galvanized
and G185 galvanized steel fasteners in lieu of standard carbon steel fasteners but it does allow the use of
aluminum flashings Check with your supplier to be sure you are getting the proper corrosion resistance on
all connecting hardware such as joist hangers and column anchors as well as lag screws deck screws and
Deck ledger attachment to house Figure 5 describes the equivalent spacing of lag screws when joists are
spaced at 16 o c This
equivalent spacing described in
Table 4 may be used in lieu of
the on center spacing listed
Many individuals have
attached ledgers directly
against hardboard siding This
will lead to the eventual
deterioration of the siding
Therefore a 1x4 treated
spacer shall be placed between
the siding and the ledger board
to allow for
water drainage and for air to get to the siding so it can stay dry
The attachment of the 1x4 is made using three 16d hot dipped galvanized nails in a staggered pattern nailed
through the siding and into the rim joist of the house The lag screws must then go through the 1x4 and into
the house rim joist Note that this attachment requires the lag screw to penetrate the house rim joist and
extend at least 1 2 beyond on the inside That means this connection requires a minimum 5 galvanized lag
screw with a standard galvanized washer Donut type spacers shall not be used unless they are not more than
Some builders or homeowners may want to remove the siding and attach the ledger directly to the rim joist of
the house This requires very close attention to flashing details so water cannot get to the house rim and
edge at the bottom To avoid
deterioration the flashing should be Ledger flashing
galvanized steel or copper
Aluminum may now be used with the Flashing should extend at least 6 up behind
the siding and housewrap 2 4 galvanized or
new CA C treatment Holes stainless steel washers for spacers assures
drying of the 2x ledger
drilled for the lag screws should be
caulked before the ledger is applied
to prevent water from entering the
main structure of the house
cause structural damage to it and possibly even the ends of the floor joists Figure 6 shows that proper
flashing extends at least 6 inches up behind the siding and housewrap The flashing should then extend down
past the ledger board and end with a drip
Galvanized or stainless steel washer spacers assure drying of the 2x ledger Double flashing over
the top of the ledger is also a good practice Carefully caulk the bolt
holes after drilling to assure
that water does not enter the
The house rim joist must be securely
main structure of the house
anchored to the house framing and it must be sitting on the foundation wall
Deck attachment for lateral loads new 2009 IRC requirement
Double flashing over ledger Floor sheathing nailing at 6 oc to joist with hold down
Flashing should extend down behind the ledger board to a drip edge
Deck lateral load connection
The 2009 IRC now requires that decks shall be attached to buildings with hold down tension devices
installed in not less than two locations per deck Each of these devices shall have an
allowable stress design capacity of not less than 1500 pounds The hold down tension device shown in Figure
7 is a Simpson
Hold down tension devices
shall be installed in not less
than two locations per
HD2A USP and other
Each device shall have an allowable stress
deck design capacity of not less than manufactures make similar hold
1500 pounds
down devices that would also
Figure 7 work for this application
Ledger attachment to open web floor trusses
Attaching a ledger to open web floor trusses requires attention to details The ledger must be attached to the
vertical ends of the floor truss member since there is nothing between the floor trusses to attach the ledger to
Finding the location and spacing of the trusses is very important Use the following tables to determine how
to attach the deck ledger board to floor trusses
Attaching deck
ledger to Trusses spaced 16 o c floor
trusses LedgerLok or
1 2 Lags per
Deck joist span Deck joist span 3 8 lags per
1 every other
Table 5 0 5 ft 0 4 ft 1 every truss
6 7 ft 1 every truss 5 6 ft 1 every truss
1 every truss 2
8 10 ft 1 every truss 7 8 ft
every other truss
Table 6 1 every truss 2
11 14 ft 9 12 ft 2 every truss
every other truss
2 every truss 3
15 18 ft 2 every truss 13 18 ft
every other truss
Trusses spaced 24 o c
LedgerLok or
1 2 Lags per
Deck joist span Deck joist span 3 8 lags per
0 5 ft 1 every truss 0 4 ft 1 every truss
1 every truss 2
6 7 ft 1 every truss 5 6 ft
every other truss
1 every truss 2
8 10 ft 7 8 ft 2 every truss
every other truss
2 every truss 3
11 14 ft 2 every truss 9 12 ft
every other truss
2 every truss 3
15 18 ft 13 18 ft 3 every truss
every other truss
Deck ledger attachment to concrete
Poured concrete or solid grouted masonry
Use wedge anchor for attaching ledger board to
poured concrete foundation
For a 1 2 diameter wedge anchor drill a 1 2 hole with a carbide tipped
masonry bit slightly deeper than the required embedment depth
Blow out the hole before inserting the wedge anchor
Put washer and nut on before inserting wedge anchor in hole
Tighten nut finger tight and then turn it 3 to 4 times with a wrench
Standard is 10 anchor diameters for spacing between anchors and 5 anchor
diameters from any unsupported edge
Deck ledgers attached to poured concrete walls
When this scenario comes up then wedge anchors shall be used to attach the ledger board to the concrete
wall See Figure 8 For a 1 2 diameter wedge anchor drill a 1 2 hole slightly deeper than the embedment
depth which is four inches for this size anchor and then blow out the dust Put the washer and nut
on before inserting the wedge anchor into the hole This protects the threads Tap it in with a hammer and
then tighten the nut finger tight After that turn it about three to four times with a wrench Be sure that the
wedge anchors are spaced a minimum of ten anchor diameters and that they are five anchor diameters from
an unsupported edge
On center spacing of wedge anchors inches
Wedge Joist span feet
0 7 ft 8 14 ft 15 18 ft
32 o c 24 o c 16 o c
0 6 ft 7 12 ft 13 18 ft
24 o c 16 o c 12 o c
Required size and spacing of hot dipped galvanized wedge anchors for
attaching deck ledger to poured concrete for a given joist span
1 2 wedge anchors shall have an embedment depth of 4 3 8 wedge anchors
shall have an embedment depth of 3
Thickness of material to be fastened plus the embedment depth plus the thickness of the nut and washer equals
minimum wedge anchor length
The forces on a Wedge Anchor are transferred to the base material in which it is installed If the anchors are installed
too close together it can cause an interaction of the forces thus reducing the holding power of the anchor As a rule
of thumb the expansion industry has established a minimum standard of ten 10 anchor diameters for spacing
between anchors and five 5 anchor diameters from any unsupported edge When vibration or sudden impact are
part of the load conditions spacing between anchors should be increased


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