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Installation Options for Deck Lateral Load Connections <br /> Allowable Loads <br /> Anchor Allowable Tension Load(lbs.)(160) <br /> Model 4i Diam. Fasteners Dry Wet o <br /> No. or Type ° <br /> DF/SP SPF/HF DF/SP SPF/HF <br /> 6-SD#9x11/2" 840 840 840 755 <br /> DTT1 Z 3/a" or 6-10dx1%2" 910 6401 795 640' <br /> SDWHS 8-10dx1Y2" 910 850 910 850 �31/4" <br /> DTT2Z/DTT2SS 13/16" Y2" 8-SDS'/4"x1'/2" 1825 1800 1825 1615 <br /> 1.Allowable loads have been increased 60%for short-term loading with no further increase allowed. <br /> 2.Dry values are applicable to installations into wood with a moisture content that does not exceed 19%. <br /> 3.Wet values are applicable to installations into wood with a moisture content greater than 19%at time 4 sus, <br /> of installation or in service.Values include an NDS wet service factor for the fasteners. 0 <br /> 4.DTT1Z installations with allowable loads below 750 lbs.do not satisfy the 2015 IRC requirements for \ <br /> deck-to-house lateral load connections. <br /> 5.DTT1Z installed with the Strong-Drive SDWH Timber-Hex HDG screw with a min.of 3"thread m <br /> penetration achieves the lesser of the table load or 855 lbs.SDWH installed with 3"of thread <br /> penetration into dry lumber has an allowable withdrawal load(160)of 1380 lbs.into SP,1225 lbs.into DF <br /> and 1020lbs.into SPF/HF. DTT1Z <br /> 6.Load values are valid if the product is flush with the end of the framing member or installed away / <br /> from the end. <br /> 7.FASTENERS:SD#9x11/2(model SD9112)=0.131"dia.x 11/2",10dx1Y2=0.148"dia.x 11/2"long. <br /> tea,. erg„ <br /> DTT2Z <br /> Conditions Not Shown in the IRC <br /> The IRC details describe particular methods that are appoved and do not represent all common framing conditions.When <br /> these are encountered,alternate methods of construction may need to be approved by the building official to ensure they <br /> satisfy the intent of the code and are at least equivalent to the prescribed method.Several alternate construction methods <br /> are shown here. <br /> DTT1Z DTT1Z—750-Pound Assembly J <br /> Condition 1 —Holdown Cannot Be Installed Flush o <br /> with Wall Sheathing <br /> Unlike some holdowns,the DTT1Z seat is not <br /> required to bear on sheathing or framing and can be <br /> --- <br /> 3"Min. o installed away from the wall to account for non- <br /> OptionaI_Si_d'e-lVou nt structural siding,joist hanger interference or other <br /> Installation conditions. Longer screw anchors may be required <br /> 3"Min. o to ensure a minimum of 3"thread penetration by a <br /> fully threaded lag screw or Strong-Drive®SDWH <br /> Timber-Hex HDG screw into the wall framing. <br /> DTT1 Z Condition 2—Top of Wall Plate Does Not Align o <br /> Do not over-drive with Bottom of Deck Joist <br /> anchoring screw <br /> The 2015 IRC detail shows a holdown installed on <br /> Predrill 3/16"dia.hole for fully threaded the bottom of the joist. However,the DTT1 Z was <br /> lag screw.Predrilling not required with tested and developed using 1 Y2"fasteners into <br /> Strong-Drive®SDWH Timber-Hex HDG Screw. either the narrow edge or wide face of a 2x member, <br /> (Siding not shown for clarity) allowing the DTT1 Z to be installed at any location <br /> along the depth of the joist. <br /> Figure 4 <br /> 2 <br />