47-55 1st Series GM Truc k Cab Roof Insulation

The 47-55 1st Series GM Truck Cab Roof Insulation from Flatline Barriers is a purpose-built thermal and acoustic barrier designed for classic first-generation Chevrolet and GMC truck enthusiasts restoring or upgrading their cab interiors. If you've owned or worked on these iconic 1947–1955 trucks, you know that factory insulation deteriorates, leading to heat transfer through the roof panel and unwanted road noise inside the cab.

This insulation kit addresses both issues directly, making it essential for builders pursuing either authentic restorations or modern comfort upgrades on vintage GM light-duty trucks. Flatline Barriers engineered this cab roof insulation to fit the precise contours of 1st Series GM truck roofs, measuring 24 inches wide by 28 inches long with a thickness of 1.5 inches that balances coverage without restricting headroom or interfering with the cab structure.

The lightweight design—just 1.23 pounds—means minimal added weight while maximizing thermal resistance and sound damping performance. Restorers and classic truck mechanics install this kit as part of a complete cab refresh, pairing it with new weatherstripping, headliner material, and side insulation for a cohesive result.