FEMA P-593 STEP-BY STEP PRESCRIPTIVE RETROFIT FOR CRIPPLE WALL BRACING & ANCHORAGE TO FOUNDATION Page 6 of 10 STEP 7 (CONTD): VERIFY/ RETROFIT RIM JOIST, BLOCKING & CONNECTION (A304.1.3 & A304.1.4) When it comes to bracing, it is crucial to not split the ends of the cross braces when nailing them into the joist. Explore Retrofit Applications Parapet Bracing Wall-to-Roof Anchorage Wall-to-Floor Anchorage Out-of-Plane Wall Bracing Lateral Shear Resistance Diaphragm Strengthening Veneer Anchoring and Stitching Concrete Foundation NZS 3604-type pile foundations Generally, a pile foundation must be in good condition to properly support the structure. Note: It is important to establish a proper truss or !oor joist layout prior to installing the alignment system. If we took off any finishes to perform the retrofit, we'll now replace the removed siding or sheetrock and button up all the walls. This will create split ends that will weaken the bracing and integrity of the structure of the floor. Over-bracing means unnecessary work and cost, and many engineers think that it is important to maintain some ductility in the sub-areas of the house. As we shall see, if they recommend this, they do not understand basic retrofit engineering or what happens to houses in actual earthquakes. Proper bridging distributes the load on the floor to other joists and over time prevents floors from sagging and squeaking do to floor joists twisting The I-joists are 11 7/8″ on 16″ centers with 3/4″ plywood on the floor. For gable ends with framing members shorter than about 3’ (3’ of head room), the forces applied by a 140 mph Finally, following the principle that a chain is only as strong as its weakest length, it is also important to complete the connection from the foundations, through the walls, and into the overhead floor framing. Cable bracing is required In this video you will learn why every EGStoltzfus home comes standard with floor joist bracing. It is ideal for new and retrofit mechanical, electrical and Another drawback to using solid blocking is that it sometimes creates a hump in the floor if the blocking and the joists shrink at different rates. Figure 1: Steel Beam Bracing (A) Braced with kicker and metal deck(1) (B) Braced with kicker and wood joist/beams(2) Before going into beam bracing in steel moment frames, it is important to discuss the behavior of a simply supported beam under gravity load. Structural Floor Joist Repairs As a remodeling contractor and carpenter one common structural framing issue I see alot of in bathroom remodeling jobs are floor joists that were cut, drilled, notched or need to be cut out to accommodate plumbing pipes and drains. Let’s say a seismic retrofit engineer recommends bracing posts that hold your floor up. On the other hand, solid blocking should be cut precisely to length and is less effective if the nails have to bridge a gap between the bridging and the joist. The retrofit method addresses four issues by strengthening the framing members of the gable end itself with the use of retrofit studs, bracing the top and bottom of the gable end so that lateral loads are transmitted into the roof and ceiling For more details about retrofit procedures, please see the Wood Frame Roof-to-Wall Connections page in the Hurricane Retrofit Guide (2010) by the Florida Division of Emergency Management. Bridging is also effective between joists … Posi-Joist Temporary Bracing Temporary Bracing This does not apply to top hung Posi-Joists in timber frame construction which do not require temporary bracing (See Section E). Numbers refer to the drawings on the SEHR Planset 6 Figure 2 Isometric view of a typical retrofit, showing foundation anchor bolts, pony wall bracing, and framing clips, from Floor joist bridging is critical to the structural strength of a floor, as shown in Figure 1. Retrofit Opportunity • This retrofit can be performed at anytime if the attic framing is exposed • Roof or siding replacement project Illustrations Retrofit Option 1: Diagonal bracing Summary Because gable roofs present a large wall surface to the Our experts will leave everything weather-tight and "paint ready". There are several “Do-It-Yourself” approaches to gable end bracing for the handy homeowner who is able to gain access to the gable end through the attic, and the cost of materials for this retrofit is under $100. Analysis, calculations and retrofit design prepared by an Oregon-licensed structural House Bolting and Soft Story Retrofit Los Angeles, CA Earthquakes.. Measure the joist spacing before you go shopping; bridging is sized for joists centered 16 in. length or equivalent to the joist width) into each side of the joist as speci"ed. Unreinforced Masonry buildings in moderate to high seismic areas can be a disaster in waiting. This ensures the bracing system does not 1 In general, the taller the gable end triangle the greater the risk of damage in a hurricane. apart. Figure 14: Diagonal brace to girder connection from Retrofit … The bracing consists of two pieces of framing lumber that install in a criss-cross configuration, which prevents the floor from sagging under weight. The B-Line series seismic bracing cable kit system is designed to brace non-structural equipment and distribution systems to help minimize damage in a seismic event. Anchor bolt location is specified by code, but generally you will be boring holes every 4 girder or floor joist by means of HRS12 straps as shown in Figure 14. 2. Blocking in Other Figure 13: Diagonal brace to post connection detail from Retrofit Report. How many spaces will you install bridging If you prefer, you can always call me at the office number below & we will be happy to In a retrofit, that means renting or buying a rotary hammer and boring holes about 1/16" larger than the bolt diameter all along the foundation. Tail joists over 12 feet long need to be supported at the header by framing anchors or on a ledger strip no less than 2 inches by 2 inches in cross-sectional area ( IRC 2015 Section R802.9). When is it Important? STUD OR ROOF JOIST FOR 500# MINIMUM ALL OTHER ADDITIONS: The new structure must comply with all current code requirements. This photo shows cripple wall bracing in progress.Note the new lumber being added as backing to create solid edges for the shear wall nailing, as well as the expansion bolts in place and the framing anchors connecting the rim joist to The maximum span is around 18 feet on any part of the floor. Are joists still in good condition 4. joist. I have a question on cross-bracing I-joists for a newly constructed home. The permanent lateral bracing of both systems is also provided by the roof sheathing and ceiling drywall. As an alternative to rigid bracing system attachments, the B-Line series seismic cable bracing kit is ideal for electrical, mechanical and plumbing applications in new and retrofit commercial construction. These types of structures have little or no ductility capacity (reference the recent “Building Drift – Do You Check It?” blog post for a discussion on ductility) required for … New products can help make the task of increasing the uplift strength of the roof to wall connection easier. When the header joist span exceeds 6 feet, approved hangers are required for the header joist-to-trimmer joist connections. The gable end bracing retrofit guide is lengthy because it contains information intended to make the process understandable and to pass along some work-arounds, hints, and tricks that have been learned. or 24 in. You can view it one Figure 1 Side view of a typical retrofit wall section. Don’t add bridging to manufactured lumber like I-joists or truss joists until you consult an engineer or building inspector. Approximate length of joist span from outside wall to beam 3. retrofit i-joist - alliance structural product sales corp. retrofit i-joist we build our products using 18 gauge galvanized steel designed to interlock dimensional joists and engineered i-joists of all sizes and spacing.
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