Wood Composite Fences and Gates Specifications . - Fencing Wood Composite Fences and Gates Specifications. Page 1. SECTION 32 31 . Wood composite fences. 2. [Wood composite gates.] 3. Excavation for posts. 4. Concrete post foundations. 1.2 REFERENCES. A. ASTM International (ASTM):. 1. C94 - Standard . B. Do not stack wood composite over 12 feet high. C. Cover wood..