1010 93RD ST SW 2024-12-30 - Laserfiche WebLink

Q.PURPOSE OF SUPPLEMENTAL TECHNICAL NOTES S.TIE-DOWN REQUIREMENTS 1. These Supplemental Techical Notes provide guidance for the installation 1. Tie-downs shall be Simpson HDU2-SDS2.5, LISP Structural of wood structural panels that use tie-downs and existing foundation Connectors PHD2A,or an equivalent with an allowable systems.Tie-downs shall be used where there is insufficient wall length tensile load of 3075 Ibs or more,installed per manufacturer's to install the length of wood structural panels specified in the Earthquake instructions. O Retrofit Schedule,Sheet S3.1. 2.End studs(s)to which tie-downs are installed,shall be 3x minimum or (n N O 2.Where"With Tie-down"(as specified on the Earthquake Retrofit double 2x.For nailing at double studs,see Sheet D5. O Schedule,Sheet S3.1)is used to determine the amount of strengthening 3.All tie-downs shall use 5/8"o(A36)threaded rod adhesive-type anchors U) _ required along each wall length,additional visual verification and testing with minimum embedment per Detail 1,Sheet D5. Q of the existing foundation system may be required to be completed by the 2 owner or general contractor and approved by the Building Official,and T.MINIMUM INSTALLATION REQUIREMENTS FOR TIE-DOWN ANCHORS CO documented in Table R-1 prior to commencing any work.Visual TO FOUNDATIONS verification and testing shall be as noted in Section R. 1. All holes shall be drilled to the specified diameter and depth. O i 3.Where these requirements are not met,a new foundation system will be 2.All holes shall be blown clean of dust with oil-free compressed air for a O W required in accordance with detail 6 Sheet D3.1. minimum of 4 seconds. � 3.All holes shall be cleaned with a nylon brush for a minimum of 4 cycles. R.EXISTING FOUNDATION REQUIREMENTS AND TESTING 4.Blow holes clean of dust with oil-free compressed air for a minimum of 4 LU 1. The size of existing foundation systems at the location of new tie-down seconds.Note:Self vacuuming drill or other approved methods may be o anchors shall be verified to be at least 15"deep("D")and 6"wide("W"). used in lieu of above The dimension"D"shall be measured from the bottom of footing to the 5.Check adhesive cartridge expiration date,open,and install per the underside of the existing mudsill. The dimension"W'shall be measured manufacturer's instructions. a from the top outside face of foundation wall to the inside top face of foundation 6.Fill the holes 1/2 to 2/3 full,starting at the bottom of the hole to prevent wall. See Table R-1,item A.1. air pockets and withdraw the nozzle as the hole fills up. 2.Verification of the overall quality of concrete along any wall line requiring 7.Insert a clean and oil-free anchor turning slowly until the anchor tie-downs shall be made and documented within Table R-1,item B.1. contacts the bottom of the hole. The building Official may require that verification shall be made by use of a 8.Do not disturb the anchor until fully cured.See manufacturer's minimum of two sacrificial torque tests along each wall line where tie-downs are instructions. used. These tests shall consist of installing 1/2"or 5/8"diameter screw-type bolts into the existing concrete and verifying that a value per Table R-2 can be Table R-1: Verification of Existing Foundation System (n o achieved. Torque tests can be performed either by the owner,a general o contractor,or a special inspection company or testing agency hired by Yes or Signature of Owner or Contractor the owner and as approved b the Building Official. Requirement a) pp y 9 NIA (Owner performing work) cn a 3.Where"Tie-downs"are used to determine the sheathed panel length required along a wall line,each adhesive anchor shall be torque tested in O N c accordance with Table R-2. A.1 The size of the existing foundation is greater Z C' than or equal to that specified in Section R,item 1. _ Signature N B.1 The existing foundation has been verified to be in N 3 p CD generally good condition at planned tie-down locations U o w as specified in Section R,item 2.See C(3)/S1 for N Q z guideline. Signature F 0 L E o CA When required by the Building Official the capacity 3� of each new tie-down anchor has been verified by N o7 -a v, passing the torque tests specified in Table R-2. Signature DA All adhesive anchors were installed per the V m 0 manufacturer's instructions per the minimum steps `~ � as noted in Section T. Si nature � �' 0 9 (r_ L O °' W / Table R-2:Foundation Verification Requirements Screw Anchor Adhesive Anchor Diameter o Torque(ft-Ibs) Torque(ft-Ibs) 1/2" 35 15 5/8" 50 20 Date: Sheet: S2