Birch Plywood – Prefinished Call For Quote $54.94 Interior Finish Plywood View Product Catalog Birch Plywood - Prefinished quantity Add to list Want a discount? Become a member. SKU: PLYPREFIN1/2. Category: Lumber. Description Description Prefinished Birch, 4×8, Sheet Plywood PLYPREFIN1/2 – Prefinished Birch, 1/2″ Suitable for built-ins, columns, wainscoting and mantels.