SBS-modified bitumen self-adhesive non-reinforced underlay membrane for pitched roofs

Self-adhesive non-reinforced SBS-modified bitumen membrane UNDERLAY NEXT SELF is used as an underlay on pitched roofs with continuous rigid wood decking (OSB-3, plywood, tongue or groove planks). The use of self-adhesive underlay membranes is mandatory in zones of valleys and eaves as these areas are most prone to leakages.

The top side of the material is covered with a strong multilayer polypropylene fabric that prevents applicators from slipping from the pitched roof. A high-performance self-adhesive bitumen compound on the bottom side provides maximum reliability and eliminates the need for the application of adhesive mastic on overlaps. The self-adhesive binder is covered with an easy-removable protective film.

Waterproofing material UNDERLAY NEXT SELF has the following advantages:

  • Sticks well to its' top surface and does not require the use of adhesive mastic on transverse and longitudinal overlaps;
  • Additional strength is granted by multilayer polypropylene fabric that also prevents applicators from slipping from the pitched roof;
  • The lightweight of the membrane simplifies the transportation and installation;
  • Installation of the membrane takes minimum time and does not require any additional equipment and skills;
  • Safe and cheap application – the membrane is applied without the use of gas and flame;
  • The high-quality polymer-bitumen compound has the property of self-healing, which grants absolute tightness in places of nail penetration;
  • Special marking lines on the fabric make the following installation of the roofing shingles easier;
  • High repairability.

Product technical data

Mass per unit area, kg/m2 1.0±0.1
Length x width, m 25 x 1
Flexibility at low temperature, °C ≤-15
Flow resistance at elevated temperature, °C ≥90
Elongation L / T, % 20±10 / 20±10
Tensile strength L / T, N/50 mm 600±200 / 600±200
Tear resistance L / T, N 500±100 / 500±100
Peel resistance of joints: overlap to film, N/50 mm 40±15
Reinforcement type no base
Protective covering type on the top multilayer polypropylene fabric
Protective covering type on the bottom anti-adhesion film