This Architectural Drawing is AutoCAD 2d drawing of Floor and wall details in AutoCAD, Dwg files. A floor of a building generally provides a wearing surface on top of a flat support structure. Its form and materials are chosen for architectural, structural, and cost reasons. A ground-supported floor may be of almost any firm material, ranging from compacted soil to reinforced concrete. Wall-Floor Area Ratio. A measure of the plan efficiency of a building, computed by dividing the face area of its external surfaces (excluding gable walls, parapet walls, and walls below the lowest finished floor level) by the 'Fully Enclosed Covered Area (FECA)', and expressing the results as a ratio. WACC. WAN. For more details and information download the drawing file.