Expandable Foam Tape

Expands to fill any-shaped gap in the construction of metal buildings, doors and windows, concrete, wood and more.

  • Expands from 1/4” to 1”
  • Expands from 3/8” to 1 1/2”
  • Follows, flexes, expands, compresses to fit
  • UV stable
  • Universally adaptable to most roof panels, including hips and valleys
  • Highly resistant to bugs and vermin
  • Economical
  • Maintains seal in heat and cold
  • Will not leach out or stain

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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)

Before expansion.


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Easy, One Person Installation

Marco’s X-Seal comes compressed at just one-quarter inch, on an easy-to-handle roll.

Marco X-Seal Step 1

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.
Marco X-Seal Step 3

Step 3:

X-Seal slowly expand up to 1-1/4" to completely fill and seal the gap.