Polybit Building Paper 1m x 25m (25m2 Roll) - Novia Membranes
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Polybit Building Paper 1m x 25m (25m2 Roll)

SKU: N5431

Est Delivery between and .

Next Day Delivery on Orders placed before 11am (ex. weekends)

Order now and get free delivery on all Novia orders over £825 ex vat.

Please note this product is non returnable

This is a traditional, polythene coated, reinforced kraft paper bitumen-bonded, building paper laminate. Manufactured with wet-strength kraft paper and meeting the technical requirements of BS 1521, Class A1F, for water-proof building papers, the product utilises polymer reinforcing scrim.

Novia Polybit is a clear polythene coated version of our A1F Standard Building Paper, typically used where conditions require additional strength and durability. 

Unlike many other recent developments in building membranes (eg breathable roof underlays), BS 1521 does not give guidance on suitable use, and as such this product is a generic material, serving a wide range of end-user defined applications. 

However, typical usage for Polybit has naturally evolved over time including for example, vapour checks, underlay on uninsulated cladding, flat lead-sheet underlay, timber floor DPM and heavy-duty temporary protection. 

Key Features:

  • BS 1521 Class A1 grade with a polythene coat on one side
  • Bitumen paper, reinforcement scrim and polythene coated laminate
  • Suitable for permanent building applications
  • Traditional product
  • Multi-use adaptable building product
  • Roll size 1.0m x 25m


  • Moisture barrier
  • Underlays on uninsulated cladding
  • Temporary Protection
  • Separation Layers
  • Bond Breaks
  • Draught
  • Damp exclusion barriers

Note: Novia products are non returnable if over or incorrectly ordered

Coverage 25m2
Biological Does not attract insects or vermin
Brand Novia
Certification BS 1521
Color Brown
Grade A1F Polybit
Liquid water resistance Minimum 24 hours
Material Type Kraft Paper
Permeability Vapour Permeable
Size 1m x 25m
Suitable For Permanent building applications
Temperature Stability Over 70°C

Est Delivery between and .

Next Day Delivery on Orders placed before 11am (ex. weekends)

Delivery will always take place on a weekday (Mon - Fri).
For information on delivery costs and more view our delivery info page.

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