AC424 Wood-based Exterior Composite Trim Treated with Zinc Borate (ZB) Preservative by a Non-pressure Process—Approved Aug 2017, editorially revised July 2021 (PDF Download)
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AC424 establishes guidelines for evaluation of wood-based exterior composite trim treated with zinc borate (ZB) preservative by a non-pressure process. The treated trim is used as nonload-bearing architectural trim and door and window trim on buildings of combustible, nonfire-resistance-rated constructions, IBC Type VB, and all construction types permitted under the IRC.
| Pages | 6 |
|---|---|
| Publisher | ICC-ES |
| Language | English |