Planning Development Amp Codes 111 South Jocogov Org-Books Pdf

Planning Development amp Codes 111 South jocogov org
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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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