The classic trussing and sub-coverage sheet

Areas of application:

  • ventilated roof superstructures
  • non-ventilated/breathable roof superstructures
  • execution as trussing sheet or overlapping sub-coverage

Instructions for use:

  • In case of ventilated roof superstructures, the sheet is applied loosely taut or with a slight sag over the rafter. The sheets should end 50 mm before the crown line of the ridge. The resulting ventilation gap should be protected against snow blowing in and rain intrusion.
  • In case of non-ventilated/breathable roof superstructures, the sheets are laying on the rafter resp. external roof insulation. At the ridge crest, the sheets overlap by approx. 20 cm.
  • The sheets must be laid with an overlapping of approx. 20 cm.
  • At the eaves resp. rain drain, the sheets must be applied on a dripping or gutter inflow sheet.
  • The sheets must be laid horizontally across the roof. Individual areas can deviate from this instruction. The overlapping of the longitudinal seam must observe the incline and may not be applied contrary to the roof pitch.
  • Connections and penetrations must be executed according to the rules and requirements of the ZVDH.
  • The sheets correspond to a trussing resp. overlapped sub-coverage in accordance with the requirements of the ZVDH.
  • The UNO sheets are not suitable for laying on formwork.

Technical data according to EN 13895-1

Length 50 m (±0.5 m)
Width 1.5 m (±0.015 m)
Straightness passed
Surface-related mass 95 g/m²
Fire resistance Class E
Resistance to water penetration W1
Water vapour permeability sd 0.02 m
Tensile strength Lengthwise 190N
Transverse direction 120N
Expansion Lengthwise 30%
Transverse direction 55%
Resistance against tear propagation Lengthwise 80N
Transverse direction 90 N
Dimensional accuracy 2%
Cold bending behaviour At -20° C passed
Polypropylene strip three-coat


Width Length m²/Roll kg/Roll Rolls/Pal.
1.5 m 50 m 75 m² 8 kg 32 pieces