An information series from the national authority on concrete masonry technology ncma tek 34c replaces tek 34b 1 bracing concrete masonry walls under constructiontek 34c construction 2014 introduction building codes typically place responsibility for providing a reasonable level of life safety for workers during construc tion on the erecting contractor. Hardboard panel siding alternate braced wall because of the relative complexity of choosing and analyzing braced wall sections per the irc, the engineered wood association apa published a guide to the irc wood wall bracing provisions apa 2009. I actually spec ilevel shear braces as they are cheaper and provide the same shear resistance as the strong walls. Modern builders face the challenge of meeting the conflicting demands of the architect and owner, and the building officials. Elements shall be straight and free of any defects that would significantly affect structural. Beyond code bracing solutions braced wall panel location r602. All exterior walls have to be braced, and the distance between braced wall lines cannot exceed 25 feet. Special connection requirements for braced wall panels. In what is not clear is how much braced wall panel is equivalent to one 28 braced wall panel. Is an interior braced wall line permitted to be braced with a single braced wall panel 48 inches in length. Alternate braced wall panel oldest of methods portal frames with holddowns, and portal frames at the garage.
Determination of bracing amount is addressed in section 2 of this guide. It should be noted that both of these sections impose a 10foot height limit on alternate braced wall panels. Any required braced wall panel locations that occur on a wall or portion of a wall that is actually of pouredinplace concrete construction is considered equivalent, and that amount of bracing will count towards the minimum required amount and will not need to be provided in another location on that rectangle side. The sections below offer information on several commonly used wall systems and details on how wood structural panels can be used to meet fundamental requirements in wall applications. Simple and quick to install, the pfs is a costeffective alternative to irc bracedwall solutions. Standard topof wall connections install with nails. Strong wall bracing selector the strong wall bracing selector swbs provides preengineered strong wall alternatives to codeprescribed braced wall panels.
Lengths of alternate braced wall panels shall be in accordance with section. Bracing concrete masonry walls under construction tek 34c construction 2014. Historically, proper wall bracing construction per the irc required a minimum of 4feet of available wall length. The cad details on this page are just some of the cad details available in this categorylibrary. The entire building wall, floor and roof assemblies interacts to distribute racking loads. Alternate braced wall lines constructed in accordance with one of the following provisions shall be permitted to replace each 4 feet 1219 mm of bracedwall panel as required by section r602. Autocad details dwg and dxf formatted cad detail files available for free viewing and downloading. Lengths of braced wall panels for continuous wood structural panel sheathing methods shall be in accordance with section table r602. Traditional wall bracing must consider many wall lines, wall line spacing, offsets in wall lines, lengths of each wall line, and many various multipliers and bracing. Seattle sdci seattle residential code, chapter 6, wall construction.
But in all cases, the braced wall panels need to line up within a braced wall line figure 1. Panels shall be supported directly on a foundation which is continuous across the entire length of the braced wall line. With design trends calling for larger window openings and narrow garage return walls, the wall space available for bracing has been limited. Framing and bracing sample drawings autocad details. Braced wall panels may not be required on the balloonframe wall portion provided the bracing amount and brace spacing requirement are satisfied for the building side. Intermittent and continuously sheathed braced wall panel s shall be constructed in accordance with this section and the methods listed in table.
Braced shear wall schedule to include anchor bolts, holdowns, studs and spacing, sheathing and nailing. Braced wall lines as far as 50 feet apart are allowed if the total amount of braced wall panel area is increased to compensate for the greater distance between the braced wall lines. Anchorage to the foundation is a critical part of the load path to resist lateral and uplift forces acting on the framing system of the building. Spacing of fasteners at panel edges for gypsum wall board opposite method lib. These panels shall begin no more than 10 feet from each end of a braced wall line and the. For simplicity, building codes have developed prescriptive bracing strategies that look only at designated braced wall lines and individual braced wall panels on those braced wall lines.
This is from the current crc california residential code which is basically the international residential code. Install the panel flush to the outside face of the framing and add furring to the opposite side. Used at the garage or at openings along a wall line in the dwelling. Spacing of fasteners at panel edges for gypsum wall board. Residential structural design guide 2000 edition hud, 2000 available as free. I just wanted to see if i was missing something in 2308. Draw a rectangle around the perimeter of the building and stagger the required number of bracing units along the four wall lines. Wall bracing methodsa lib letin bracing dwb diagonal wood boards wsp wood structural panels sfb structural fiberboard sheathing gb gypsum board pbs particleboard sheathing pcp portland cement plaster hps hardboard panel siding abw alternate braced wall pfh intermittent portal frame pfg intermittent portal frame at garage a.
Braced wall panels shall be constructed of bracing methods, materials, and minimum braced panel lengths complying with table r602. A braced wall panel is a segment of a braced wall line consisting of the wood structural panel e. Wall sheathing is essential to the structural integrity of a home. The international codes icodes are the widely accepted, comprehensive set of model codes used in the us and abroad to help ensure the engineering of safe, sustainable, affordable and resilient structures. Introduction to wall bracing johnson county, kansas. There shall be a braced panel in every 250 of a braced wall line, with not less than two braced panels on a braced wall line. Construction of braced wall panels shall be by one or a combination of the methods in table 2308. Braced wall lines are basic elements in conventional light frameconstruction and shall consist of braced wall panels. Lengths of alternate braced wall panels shall be in accordance with section r602. With the apa simplified wall bracing method the builder only needs to consider four walls, a few simple calculations, and one bracing method. Simpson strongtie strongly supports sustainable building practices, such as those established by the u. Sway brace lateral support framing contractor talk.
In a continuouslysheathed wood structural panel braced wall line, the minimum braced wall panel length shall be permitted to be in accordance with table r602. The dimensions and proportions of bracing panels may vary depending on factors such as the wall s height, the size of any openings in the wall, and the number of stories above the wall. Chapter sps 321 construction standards subchapter i scope sps 321. Strongwall shearwalls catalog the complete reference for product, application and technical information for our strong wall wood and steel shearwalls, including engineered design solutions. The maximum height and minimum width of each panel shall be in accordance with table r602. Interior braced wall lines must comply with the same provisions as exterior braced wall.
The braced wall panel shall be permitted to begin no more than 8 ft from each end of the braced wall line provided the following occurs. Green building councils leadership in energy and environmental design leed green building rating system, nahb green, and state and city specific green building codes. Refer to section 1 of the guide, in particular the definition for braced wall line and figure 2c. If one requires 12 feet of braced wall panel and it could be done in one continuous run, can one then replace it with one 28 alternate braced wall panel. Construction methods for braced wall panels upcodes. Structural wood panel sheathing contributes to the structures ability to handle uplift loads, lateral loads and wind pressures while providing secure connection to. As a minimum, it is recommended that when using strong wall panels, the foundation match the requirements for the alternate braced wall panel method abw in the irc or ibc. Irc wall bracing applied building technology group. Step 6once the above requirements are met, each braced wall panel may be replaced by an alternate braced wall panel constructed in accordance with section 2308. Lateral loads may be transferred to the foundation via braced frames or rigid frames, diagonal rods or x bracing, including letin bracing in the case of wood frame construction, or other methods. Cutting holes in sheathing are there any code restrictions on cutting outlet boxes into the sheathing of an interior alternate braced wall panel.
Identify braced wall lines and braced wall panels on a separate schematic floor plan with braced wall lines identified by numbers in one direction and letters in the opposite direction. Required wall bracing for seismic and wind are separated in two separate tables seismic only sdc c and d categories 4. The irc prescribes anchor bol t criteria for connecting the sill plate to the foundation. Strong wall model numbers and foundation anchorage designs are determined to meet job specific requirements and provide the narrowest bracing solutions possible. Braced wall panels shall have gypsum wall board installed on the side of the wall opposite the bracing material. Simplified wall bracing method using wood structural panel. Gypsum wall board shall be not less than 1 2 inch 12. A full heightsection of wall constructed to resist horizontal loads with a minimum panel length. Other interior and exterior panel products and finishes installed per manufacturer requirements. The building official has the final authority in rendering interpretations of the code as. Where brace panels are located on the balloonframe wall portion, they shall have a heighttowidth ratio of not more than 2. The entire building wall, floor and roof assemblies interact to. An introduction to engineered shear wall design, location, and inspection points is offered. Heres an example of a braced wall panel which acts similarly to what your product is going to try to do.
The number of braced wall panels required for each side of a building elevation view at each story level of the building shall comply with table r602. Rectangle sides 60 feet long or less ratio of side length a maximum of 3. Hps hardboard panel siding abw alternate braced wall pfh intermittent portal frame pfg intermittent portal frame at garage a. Conventional lateral bracing requirements for single family. A braced wall line shall consist of braced and or alternate braced wall panels that meet the requirements for location, type, and amount of bracing specified in the associated tables in section r602. For wind, braced wall lines may be spaced at 60 max 7. A braced wall panel keeps the wall square by transferring shear from the top of the wall to the bottom braced wall panels are built in a specific way braced wall panel has a specific amount of resistance panels are placed at specific locations within a braced wall line to resist the lateral loads typically the ends of. The building codes ibc and irc use the terms braced wall panel and braced wall line throughout. Apas simplified wall bracing method, an enhanced variation on the 2012 irc simplified wall bracing provisions section r602. Additional minimum braced wall panel length information taken from irc section r602. Method pfg 2012 irc simplified wall bracing 44 lateral support and stem walls use section r602. The bracing amounts and location determined for braced wall line r may be used for braced wall line l. The international code council icc is a nonprofit organization dedicated to developing model codes and standards used in the design, build and compliance process.
Conventional lateral bracing requirements for single. Dimension the length of each braced wall line and the distance. Each 32 alternate braced wall panel may be substituted for a 48 braced wall panel of. Required wall bracing for wind is based on the spacing of braced wall lines and adjustment factors including wind exposure 5. When alternate braced panels are required to be sheathed on both faces, walls may be braced on one side of the wall only when the panel thickness is increased to a nominal 1. Conventional light frame wall bracing pima county, arizona. Wood structural panel wood structural panel with stone or masonry veneer structural fiberboard sheathing gypsum board particleboard sheathing portland cement plaster hardboard panel siding alternate braced wall because of the relative complexity of choosing and analyzing braced wall sections per. The rear braced wall line is drawn to split the offset in the rear wall line. A guide page 3 manner, offsets can affect braced wall panel location and, thus, the layout of openings for windows and doors in a series of braced wall lines on a given building side elevation. Where wood structural panels are used for the roof, floors, or walls in a building, lateral loads can be accommodated through the use.
Building codes require that walls resist wind pressures and wall racking forces and provide weather protection. There is no length provided for the wood structural panel allowed in 2308. Builders and designers can choose from a variety of wall sheathing products and wall systems. Bwp bwp height bwp minimum length of bwps length table r602. Understanding braced wall lines per the 2018 irc neboea. This bulletin outlines braced wall panel options for narrow wall segments irc r602.
Provide a complete braced shear wall plan and reference a braced shear wall schedule at each braced shear wall location. When exterior shear wall lines or braced wall panels are not in one plane vertically from the. A braced wall line is an imaginary line which might not occur where actual braced panels are located. Classicwall bracing braced wall lines bwl braced wall panels bwp greater flexibility more complex. Specified alternate attachments for roof sheathing shall be permitted where the ultimate design wind speed is less.
Each panel shall be sheathed on one face with 38inch minimum thickness wood. Alternate braced wall panels allow lengths less than 48. The wind and seismic wall bracing solutions in this tool may be considered equivalent to the code braced wall panel construction method wsp wood structural panel with gypsum board applied on the opposite face as defined in table r602. Walls may be installed with solid or multiply headers, see page 47 detail 4, 5wsw4 for fastening and furring requirements. Alternate braced wall panels must be directly anchored to foundation with hold down anchors. These panels shall begin no more than 10 feet from each end of a braced wall line and the distance between adjacent edges of braced wall panels shall be. As shown in the floor plan below figure 1, four exterior braced wall lines are identified.
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