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COC and students are entitled to 1 copy of each publication at a reduced rate per calendar year. Any additional ordered quantities above 1 for the same item will be charged at a discounted non-member rate. Does not include sale items. ANSI / AWC PWF-2021 - Permanent Wood Foundation Design Specification. A Permanent Wood Foundation (PWF) system is intended for light frame construction including residential buildings. This document primarily addresses the structural design requirements. Special Notice : The Microsoft Edge web browser does not support viewing of PDFs. Please use another web browser or PDF reader to open and view those files. ...