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Vinyl Windows with Full-Width Jambs Most wood windows can be ordered with jambs that match the wall framing (either 49/16-inch jambs for 2x4 walls or 69/16-inch jambs for 2x6 walls). But because most vinyl windows are narrow (usually between 2 and 3 inches thick), they require an extra step when they are trimmed — either drywall returns or site-built jamb extensions. Now A & H Windows has come out with the Designview window, a single-hung vinyl window with 49/16-inch jambs. The vinyl portion of the jambs is 4 inches thick, measuring from the back of the nailing fin. These vinyl jambs have a cleat that is locked into a factory-provided 9/16-inch-thick