Marco Industries Logo
Close this search box.

X-Seal™ Expandable Foam Tape

X-Seal expands from 1/4” to 1” and from 3/8” to 1 1/2”, allowing it to fill any shaped gap in the construction of metal buildings, doors and windows, concrete, wood and more. It is adaptable to most roof panels, including hips and valleys. Highly resistant to bugs and vermin, X-Seal maintains its seal in heat and cold and will not leach out or stain.

X-Seal™ Expandable Foam Tape

Learn More

The versatility of Marco’s X-Seal makes it perfect for sealing any shaped gap in the construction of metal buildings, doors and windows, concrete, wood and more. It has excellent compressibility and recovery (for minimal compression set), and its UV-stable design maintains a seal during thermal expansion and contraction of building panels. An ideal thermal and sound insulator, X-Seal is able to hold the exterior out and the interior in while allowing vapors to move through. A hermetic seal allows the absorption of moisture and when conditions permit, the slow release of moisture through evaporation. With X-Seal, there’s no shrinkage or blow-out from closed-cell breakage and no worry about drying out or becoming hard and brittle.

Description/Base/Color: Pre-compressed, self-expanding PUR foam impregnated with a high-quality modified acrylic, flame retardant emulsion. The base foam is black; other colors available.
Density: 10 lbs./cu ft. (150kg/m3)
Flammability: UL 94 HF1, Self-extinguishing, DIN 4102, B1 compression at 50%, B2 compressed
Temperature Stability Range: -40°F to 212°F
Manufacturer’s Lab: -40°C to 120°C
Weather Resistancy: Excellent
Compression Set: Maximum 2%
Tensile Strength: 21.8 psi
Thermal Conductivity: 12,106 BTU (hr.) (ft2) (*F/ft)

How To Install

X-Seal comes compressed at just ¼ inch on an easy-to-handle roll.

Step 1

Cut the desired length of X-Seal.

Step 2

Place X-Seal into the gap opening—even one with irregular hips and valleys—and remove the protective release paper.

Step 3

X-Seal slowly expand up to 1" to completely fill and seal the gap.

More Sealants

Learn about our other sealant products featuring Marco-proven performance.


Dig deep with technical tools, reference charts, installation videos, and more.