CSA Qty. 1 2 3 4 5 6 7 8 9 10 Add to Cart Horizontal Vinyl Siding: D4-5 - is currently on backorder. You may still purchase now though and we'll ship as soon as more become available. Classic Vinyl Siding in a Vast Array of Colours. 12'x 1\2". 22 pcs/bx 200 sq ft/bx 18.58 sq m.