*Corrected, April 2001

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1 LEGACY REPORT * Reissued January 1, 2001 ICC Evaluation Service, Inc. Business/Regional Office # 5360 Workman Mill Road, Whittier, California # (562) Regional Office # 900 Montclair Road, Suite A, Birmingham, Alabama # (205) Regional Office # 4051 West Flossmoor Road, Country Club Hills, Illinois # (708) Legacy report on the 1997 Uniform Building Code DIVISION: 06 WOOD AND PLASTICS Section: Wood and Plastic Fastenings EARTHBOUND SEISMIC HOLDDOWN SYSTEM USING THE IMPASSE DEVICE INQUEST ENGINEERING POST OFFICE BOX 1102 WOODINVILLE, WASHINGTON SUBJECT The EARTHBOUND Seismic Holddown System Using the Impasse Device. 2.0 DESCRIPTION 2.1 General: The EARTHBOUND Seismic Holddown System is a holddown system used with wood-framed shear wall systems. The EARTHBOUND system, consisting of an Impasse Device, a threaded steel rod, and a bearing plate, resists uplift in the walls while compensating for settlement, shrinkage, and compression loading by the continual downward actuation of the Impasse Device. 2.2 Components: Impasse Device : The Impasse Device is a cylindrical, high-strength, structural connector that enables axial compression travel along a bolted or sliding connection and that withstands loads in the opposite direction (tension). The Impasse Device is available in different strength levels and in travel lengths of one inch, two inches and three inches (25.4 mm, 51 mm and 76 mm). The Impasse Device will actuate in increments of inch (1.78 mm) or less with 15 to 20 pounds (67 to 89 N) force. See Table 1 for different Impasse Device series and allowable load capacities. The EARTHBOUND Seismic Holddown System uses Series 2xx Impasse devices manufactured from the three different materials noted in this report. Series x10, x20 and x30 include an outer cylinder (IMP cylinder) and an inner cylinder (IMP nut). Refer to Table 2 for dimensions of the Impasse Device series. Cylinders are produced from ASTM A 311 grade steel with a minimum tensile strength of 100,000 psi (689 MPa); cold-finished carbon steel (Ledloy) complying with ASTM A 108 Grade 12L14 with a minimum tensile strength of 70,000 psi (483 MPa); or aluminum complying with 6065-T6511. The Impasse Device components also include C-shaped locking springs with a minimum tensile strength of 200,000 psi (1379 MPa), manufactured in accordance with ASTM A 229; and a conical-shaped compression spring Steel Threaded Rods: The Impasse Device is used with steel threaded rods or bolts having nominal diameters ranging from 3 / 8 inch to 1 1 / 8 inches (9.5 mm to 28.6 mm) in all load capacities, as shown in Table 3. Standard-grade threaded rods shall comply with ASTM A 36. High-strength rods or bolts must comply with ASTM A 449, or ASTM A 193, Grade B Bearing Plate: Bearing plates are used at floor levels or compression bridge conditions, and are manufactured from steel conforming to ASTM A 36, with dimensions and color codes noted in Table Allowable Loads: Under allowable stress design, the allowable loads for the holddown system components are as shown in Table 3. Allowable loads for bearing plates are shown in Table 4. Calculations considering the capacity of components listed in this report, capacity of rod and nuts, capacity of bearing plates, anchorage into the concrete foundation, and interaction of the system with wood components of the building, must be submitted to the building official for review and approval for each holddown system installation. Supports shall be designed in accordance with the code to transfer loads into the system. 2.4 EARTHBOUND Seismic Holddown System Installation: Anchor bolt installation shall be done in the following sequence: 1. Anchor bolts are installed into the foundation in accordance with the approved plans. 2. Threaded rod couplers are placed on the anchor bolts. 3. Holes are drilled into the floor deck or roof deck, as applicable, to receive the rods. 4. The threaded rods are placed through the hole and connected to the anchorage. 5. The bearing plates are placed over the rod, followed by the Impasse inner cylinder/imp nut. 6. The IMP nut is placed hand-tight to the steel plate and then torqued one full turn past hand-tight. Care is taken to avoid damaging the rings area of the IMP nut. *Corrected, April 2001 ICC-ES legacy reports are not to be construed as representing aesthetics or any other attributes not specifically addressed, nor are they to be construed as an endorsement of the subject of the report or a recommendation for its use. There is no warranty by ICC Evaluation Service, Inc., express or implied, as to any finding or other matter in this report, or as to any product covered by the report. Copyright 2006 Page 1 of 5

2 Page 2 of 5 7. The outer cylinder is placed over the inner cylinder (IMP nut) and onto the steel plate. 8. The conical spring is placed over the rod and on top of the outer cylinder. 9. The hex nut is placed on the rod and tightened onto the spring until the spring is fully compressed. 10. A threaded rod coupler is placed over the remaining portion of the threaded rod and the installation continues to the next level. Illustrative details are found in Figures 1 through Identification: Each package containing all components bears a label noting the manufacturer s name (InQuest Engineering) and address, the component model or series number, and the ICBO ES evaluation report number (ICBO ES ). The IMP outer cylinder is color-coded to represent the allowable component travel for each S, L or A series. The color codes for the IMP cylinders are indicated in Table 5. Bearing plates are color-coded as noted in Table EVIDENCE SUBMITTED Installation instructions, calculations, reports on monotonic and cyclic tests, and a quality control manual. 4.0 FINDINGS That the EARTHBOUND Seismic Holddown System Using the Impasse Device complies with the 1997 Uniform Building Code (UBC), subject to the following conditions: 4.1 Devices are installed and manufactured in accordance with this report and the manufacturer s instructions. 4.2 Allowable loads are as set forth in Tables 1 and 3 of this report. 4.3 Structural calculations, demonstrating that the applied loads do not exceed the allowable loads, are submitted to the building official for approval. 4.4 No further duration of load increase for wind or earthquake is allowed. 4.5 When the Impasse Device is used as a standalone fastener, independent of the EARTHBOUND Seismic Holddown System, the applied loads do not exceed the allowable loads noted in this report. 4.6 When installation is complete, steel and aluminum Impasse devices are limited to dry, interior locations, except as noted in Section For extended exterior or wet environment exposures, and when in contact with dissimilar metals, aluminum Impasse devices must comply with Section of the UBC. Evidence of compliance must be submitted to the building official for approval. This report is subject to re-examination in one year. ASTM A 311 STEEL S SERIES TABLE 1 IMPASSE DEVICE SELECTION 1,2,3,4,5,6 ASTM A L14 STEEL L SERIES ALUMINUM 6065-T6511 A SERIES TRAVEL INCREMENT (inches) IMP S210 25,000 IMP L210 21,000 IMP A210 16, IMP S220 25,000 IMP L220 21,000 IMP A220 16, IMP S230 IMP L230 21,000 IMP A230 16, IMP S410 46,800 IMP L410 IMP A410 21, IMP S420 46,800 IMP L420 IMP A420 21, IMP S610 63,300 IMP L610 IMP A IMP S620 63,300 IMP L620 IMP A For SI: 1 inch = 25.4 mm, 1 pound = 4.45 N. 1 Series 2xx denotes an Impasse Device with two total locking C-rings. Impasse devices used in the EARTHBOUND system are listed without the leading series number 2, unless otherwise noted. For example, IMP A25 = Aluminum Series 2-inch travel component for a 5 / 8 -inch rod diameter. 2 Series 4xx denotes an Impasse Device with four total locking C-rings. 3 Series 6xx denotes an Impasse Device with six total locking C-rings. 4 The Series center digit x1x denotes total travel length, in inches. (For example, the 1 denotes one inch). 5 The Series last digit (xx3) denotes threaded rod diameter size in eighths of an inch (3 equals 3 / 8 -inch-diameter rod). 6 Allowable load capacities are based on ultimate load at 1 / 8 -inch displacement with a safety factor of 2.5, and include a one-third increase for wind or earthquake loads.

3 Page 3 of 5 TABLE 2 IMPASSE DEVICE DIMENSIONS SERIES INNER CYLINDER (IMP NUT) 1 OUTER CYLINDER (IMP CYLINDER) Diameter, inches (mm) Diameter, inches (mm) Height (inches) IMP Sx (40) (51) (46) IMP Sx (40) (51) (68) IMP Lx (40) (51) (46) IMP Lx (40) (51) (68) IMP Ax (50) (60) (98) IMP Ax (50) (60) (98) IMP Ax (50) (60) (98) 1 The height of the IMP nut varies, depending on the height of the outer cylinder, to accommodate tightening of the final assembly. TABLE 3 HOLDDOWN SYSTEM ALLOWABLE LOAD CAPACITIES HOLDDOWN IMPASSE DEVICE THREADED ROD SYSTEM Series Tension Load Capacity Designation 2,3 Dia. Allowable DESIGNATION Designation 1 (inch) Tension ASTM A 311 ASTM A 108- Aluminum 1 12L14 IMP 213 IMP ,000 21,000 16,000 R4 1 / 2 5,240 IMP ,000 21,000 16,000 R5 5 / 8 8,180 IMP ,000 21,000 16,000 R6 IMP ,000 21,000 16,000 R7 IMP ,000 21,000 16,000 R8 1 20,940 IMP ,000 21,000 16,000 R9 1 1 / 8 26,510 IMP 223 IMP ,000 21,000 16,000 R4 1 / 2 5,240 IMP ,000 21,000 16,000 R5 5 / 8 8,180 IMP ,000 21,000 16,000 R6 IMP ,000 21,000 R7 IMP ,000 21,000 R8 1 20,940 IMP ,000 21,000 R9 1 1 / 8 26,510 IMP 233 IMP ,000 21,000 16,000 R4 / 2 5, IMP ,000 21,000 16,000 R5 / 8 8,180 IMP ,000 21,000 16,000 R6 IMP ,000 R7 IMP ,000 R8 1 20,940 IMP ,000 R9 1 1 / 8 26,510 IMP 416HS 46,800 R6HS 3 / 4 23,560 IMP 417HS 46,800 R7HS / 8 32, HS IMP 418HS 46,800 R8HS 1 41,890 IMP 419HS 46,800 R9HS 1 1 / 8 53,010 IMP ,000 R7 IMP ,000 R8 1 20,940 IMP ,000 R9 1 1 / 8 26,510 For SI: 1 inch = 25.4 mm, 1 lbf = 4.45 N, 1 psi = 6.89 kpa. 1 Tension load capacities include 1 / 3 increase for wind or earthquake loads. No further increase is permitted. 2 Standard-strength rod, denoted by letter prefix R, must conform to ASTM A 36 steel: F u = 60,000 psi. 3 High-strength rod, denoted by letter prefix R and suffix HS, must conform to ASTM A 449 or ASTM A 193 Grade B7: F u = 20,000 psi.

4 Page 4 of 5 COLLECTED DIFFERENTIAL TENSION LOAD 3,4 PLATE SIZE 1,2 TABLE 4 BEARING PLATES ALLOWABLE LOAD CAPACITIES PLATE COLOR CODE PLATE DIMENSIONS (inches) Width Length Thickness 8,000 P8 Black 3 1 / / 4 10,000 P10 Blue 3 1 / / 8 12,000 P12 Gray 3 1 / / 8 14,000 P14 Red 3 1 / / 4 16,000 P16 Green 3 1 / / 8 18,000 P18 Yellow 3 1 / For SI: 1 inch = 25.4 mm, 1 lbf = 4.45 N, 1 psi = 6.89 kpa. 1 Plate steel shall be ASTM A 36: F u = 60,000 psi. 2 Substitutions of designated bearing plate shall not be permitted unless there is written approval from the engineer and building official. 3 Collected differential tension loads are tension loads resisted by the Impasse Device plate at levels where Impasse Device floor and plate are located. 4 Collected differential tension loads are based on plate placement on lumber with minimum F cz = 625 psi. ASTM A 311 STEEL S SERIES TABLE 5 IMP CYLINDER IDENTIFICATION ASTM A L14 STEEL L SERIES ALUMINUM 6065-T6511 A SERIES Color Code Color Code Color Code IMP S210 Red IMP L210 Gold IMP A210 Gray IMP S220 Green IMP L220 White IMP A220 Black IMP L230 IMP A230 Blud FIGURE 1 IMPASSE DEVICE EXPLODED VIEW FIGURE 2 IMPASSE DEVICE INSTALLED VIEW FIGURE 3 COMPRESSION BRIDGE INSTALLATION FIGURE 4 TYPICAL ANCHOR INSTALLATION

5 Page 5 of 5 FIGURE 5 MINIMUM JOIST BLOCKING REQUIREMENTS FIGURE 6 TYPICAL ANCHOR BOLT LOCATION LAYOUT FIGURE 7 ALLOWABLE ROD OFFSET