Our most popluar, highly vapour permeable roofing underlay with 170 g/m²

173 Alfa Rufol UDB-A 165 (roofing underlay)

A-classified (ZVDH), driving rain proof, highly vapour permeable roofing underlay for ventilated and non-ventilated pitched roofs. Suitable as temporary roofing up to 6 weeks (roof pitch > 16°). Available with or without self-adhesive strips.

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173 Alfa UDB-A 165 sheathing membrane in dark grey or blue

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Item-No. Measures Packacking Unit Price Quantity
173 5015 SK (002) 1,5 m x 50 m (75 m²)
dark grey, with adhesive strips		 2 rolls **
173 5015 SK (010) 1,5 m x 50 m (75 m²)
dark grey, with adhesive strips		 10 rolls **
173 5015 SK (024) 1,5 m x 50 m (75 m²)
dark grey, with adhesive strips		 24 rolls **
 
173 5015 BSK (002) 1,5 m x 50 m (75 m²)
blue, with adhesive strips		 2 rolls **
173 5015 BSK (010) 1,5 m x 50 m (75 m²)
blue, with adhesive strips		 10 rolls **
173 5015 BSK (024) 1,5 m x 50 m (75 m²)
blue, with adhesive strips		 24 rolls **
 
173 5015 (002) 1,5 m x 50 m (75 m²)
dark grey		 2 rolls **
173 5015 (010) 1,5 m x 50 m (75 m²)
dark grey		 10 rolls **
173 5015 (024) 1,5 m x 50 m (75 m²)
dark grey		 24 rolls **
 
173 5015 B (002) 1,5 m x 50 m (75 m²)
blue		 2 rolls **
173 5015 B (010) 1,5 m x 50 m (75 m²)
blue		 10 rolls **
173 5015 B (024) 1,5 m x 50 m (75 m²)
blue		 24 rolls **
 
173 5075 (004) 750 mm x 50 m (37,5 m²)
dark grey		 4 rolls **
173 5075 (020) 750 mm x 50 m (37,5 m²)
dark grey		 20 rolls **
173 5075 (040) 750 mm x 50 m (37,5 m²)
dark grey		 40 rolls **
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Product description

TU-Berlin certified roofing underlay for pitched roofs

Alfa Rufol UDB-A 165 is the A-classified (ZVDH), driving rain proof, highly diffusion open roofing underlay (sub-membrane, sheathing membrane) for ventilated and non-ventilated pitched roofs. It is applied between the thermal insulation and main battens. Suitable for the direct installation on top of the thermal insulation. Alfa Rufol UDB-A 165 prevents the penetration of humidity (e.g. due to driving snow) and penetration of dirt into the thermal insulation.

The 3-layer structure protects the functional membrane from damages and reduces the slipping risk for the processor.
Easy handling: Auxiliary lines allow exact overlaps.

Also available with two additional self-adhesive strips for easier application.

Advantages

  • Meets the requirements of ZVDH and EnEV!
  • Highly vapour permeable
  • Step-proof
  • Driving rain proof
  • UDB-A / USB-A according to ZVDH
  • Weight 170 g/m²
  • Temperature resistance -40 up to +100°C
  • Tear resistance (nail) >200 N/50mm
  • Fire behaviour class E (EN 13501-1)
  • Sd-value 0,02m
  • Watertightness W1 (EN 13895-1)
  • Tested by TU Berlin

Proven Quality

Alfa 10 years System-Warranty Alfa Quality-Seal at fair prices

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