Tensar® Glasstex®

20 Years of Successful Project Use
2 Layer Composite Interlayer Product
3 Functions; Reinforcement, Stress-relief and Waterproofing
  • One of a range of Tensar of asphalt interlayer products – offering the right products for specific problems
  • Tensar has over 30 years of experience with asphalt interlayers
  • Glasstex interlayer serves three functions of reinforcement (load transfer), stress relief and waterproofing
  • Controls cracking in asphalt to extend pavement life

Glasstex is a low-profile composite interlayer product comprising a grid of glass filament bundles, stitch-bonded to a non-woven paving fabric. The high-modulus glass filaments provide high absorption of stress at low strains, and after being saturated with bitumen the fabric performs a sealing function. Glasstex provides reinforcement, stress relief and interlayer barrier functions, as defined by EN 15381.

Typically installed under the asphalt binder course, Glasstex’s high-stiffness grid is bonded to the asphalt, providing a reinforcement function by absorbing stress at low strain levels.

The reinforced layer created prolongs service life, by controlling reflective cracking and mitigating longitudinal cracking caused by differential settlement between new and existing lanes on widened roads. 

Product Range

Available in a range of strengths

Glasstex is available in a range of tensile strengths to suit the needs of specific projects:

  • Glasstex P50
  • Glasstex P100
  • Glasstex P200

The Benefits of Tensar Glasstex

Tensar Glasstex controls reflective cracking in overlays, as well as mitigating longitudinal cracking between new and existing lanes on widened roads. It also provides a barrier to prevent ingress of water to the lower pavement layers.

How does Tensar Glasstex deliver three functions?

The product is composed of a high-stiffness glass yarn grid stitch-bonded to a polypropylene paving fabric. The grid absorbs stress at low strains by bonding with the asphalt overlay, providing a reinforcing effect. The fabric aids installation and together with the bitumen absorbed from the bond coat, provides a stress relief effect (stress absorbing membrane interlayer - SAMI) and interlayer barrier against ingress of moisture and oxygen. The product functions of reinforcing, stress relief and interlayer barrier are as defined in EN 15381.

Easy to Install 

First, a bitumen bond coat is spray-applied to the substrate, and then Tensar Glasstex interlayer is simply unrolled onto the bond coat. The application rate of the bond coat is specified to ensure absorption into the interlayer fabric. Once cured, the bond coat firmly secures the interlayer in place ready for overlay with a traditional paving machine. While manually unrolling the interlayer is perfectly possible, the use of a specialist interlayer installation machine enables a faster installation to a high quality.

Fully Millable and Recyclable

Unlike other interlayer systems, Glasstex mats are easily broken up by conventional milling equipment and reusable in other road projects as recycled asphalt pavement (RAP). Its main component is silica, a natural substance that is environmentally friendly.