1500 52ND ST SE 2025-04-22 - Laserfiche WebLink

• • Code Official Use Only EIApproved Approved with Amendment Denied Reasons: Signature: Description of Alternate/Modification (include reason for request): Waive requirements of C402.5.1.2- Building Test for the small portion of the project where it is required. This project is governed by Chapter 5 of the WSEC for existing buildings. Per the exception listed in C503.3, C402.5 does not apply to basic alteration scope, only where there is a change in space conditioning. It also applies to the addition scope governed by C502.1. Description of Code Requirement(include section): C402.5.1.2 Building test.The completed building shall be tested and the air leakage rate of the building envelope shall not exceed 0.25 cfm/ft2 at a pressure differential of 0.3 inches water gauge(2.0 Us x m2 at 75 Pa)at the upper 95 percent confidence interval in accordance with ASTM E 779 or an equivalent method approved by the code official. A report that includes the tested surface area,floor area, air by volume, stories above grade, and leakage rates shall be submitted to the building owner and the code official. If the tested rate exceeds that defined here by up to 0.15 cfm/ft2, a visual inspection of the air barrier shall be conducted and any leaks noted shall be sealed to the extent practicable.An additional report identifying the corrective actions taken to seal air leaks shall be submitted to the building owner and the Code Official and any further requirement to meet the leakage air rate will be waived. If the tested rate exceeds 0.40 cfm/ft2, corrective actions must be made and the test completed again.A test above 0.40 cfm/ft2 will not be accepted. Justification (attach copies of any reference, test reports, expert opinions, etc.): For a project that is more than 20,000 SF of conditioned area, C402.5.1.2 applies to less than 800 SF of space. Much of this 800 SF contains "open air" connection (no walls or partitions) to portions of the project that have no air leakage testing or air barrier requirements per Chapter 5. It is impractical to perform air leakage testing on this part of the project and even testing the few remaining "enclosed" areas where C402.5 applies would not provide any meaningful benefit, as we would be demonstrating that a tiny fraction of the overall envelope meets the air leakage maximum targets for new construction. There is real-world air-leakage reduction that will be achieved as the alteration scope walls are upgraded per the scope of this project, but again, there is no requirement to actually conduct an air leakage test for—96% of the project square footage. Form originally created by: Seattle Construction Review & Inspection Quality Ardel Jala, Building Official Modified for City of Everett 212