Testing was performed at Simpson's IAS Accredited Laboratory to examine the capacity of the narrow wall systems looking a different variables. When Simpson's tests did not match the results of APA testing, Washington State University was commissioned to repeat testing to validate Simpson's Test Results. Links to the test can be found below.

Simpson Testing

Baseline Wall Testing

• Tests 2005310 & 2005311: Holdown & No Gypsum (Similar to APA’s Testing)
• Tests 2005312 & 2005313: No Holdown & No Gypsum (Similar to APA’s Testing)
• Tests 2005319 & 2005320: Holdown & with Gypsum
• Tests 2005321 & 2005322: No Holdown & with Gypsum

Narrow Wall Panel Testing (6:1 Aspect Ratio)

• Tests 2005323 & 2005326: Holdown & with Gypsum
• Tests 2005324 & 2005325: No Holdown & with Gypsum

Misinstallation Testing (6:1 Aspect Ratio Wall)

• Tests 2005298 & 2005299: Holdown & No Gypsum 2 Rows of Nails at 4” o.c
• Tests 2005304 & 2005305: No Holdown & No Gypsum 2 Rows of Nails at 4” o.c.
• Tests 2005296 & 2005297: Holdown & No Gypsum 1 Row of Nails at 3” o.c.
• Tests 2005302 & 2005303: No Holdown & No Gypsum 1 Row of Nails at 3” o.c.

WSU Testing

Washington State University Test Results