Polybit (Polythene Coated A1F)
Our polythene coated grade A1F Building Paper
This is our traditional reinforced kraft paper bitumen-bonded building paper laminate used within the construction industry, which meets the requirements of the highest grade of BS 1521 materials.
Novia Polybit is a clear polythene coated version 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.
Novia Polybit can be found on NBS Chorus and NBS Source software packages. Full information can be found for NBS specification with the table below. The links will open a pop up window with full specification information.
- 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
As this product has so many different uses, the installation will vary depending on the final use and would be down to the installer to ensure they are happy with all fixings.