A renovation specifies EIFS with drainage on a framed wall of Type V construction in a Group R-2 building. Under 2021 IBC 1407.4.1, what average minimum drainage efficiency must the EIFS achieve when tested to ASTM E2273?
- A50 percent
- B75 percent
- C85 percent
- 90 percent
Where to look it up
https://core-docs.s3.amazonaws.com/documents/asset/uploaded_file/3836/Lennox/3042180/2021_International_Building_Code.pdf
Why D is correct
EIFS with drainage is required for the stated framed-wall construction and occupancy, and must achieve an average drainage efficiency of at least 90 percent under ASTM E2273. This system-performance requirement replaces the unsupported universal 1.5-inch thickness claim; installation must also follow the manufacturer's instructions under 1407.5. Source: 2021 IBC 1407.4.1 and 1407.5; https://core-docs.s3.amazonaws.com/documents/asset/uploaded_file/3836/Lennox/3042180/2021_International_Building_Code.pdf