Mastic EverPlank luxury vinyl siding from Cornerstone Building Brands has a wood-grain texture and a foam insulation backing that provides wood-like rigidity. No caulking is required for installation; panels butt together using a bonding plate and custom-formulated adhesive, leaving no gap or overlap at the seams. The siding is available in 6-inch-by-12‑foot boards. cornerstonebuildingbrands.com
