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B1F

 

Our lowest-cost reinforced BS 1521 building paper

B1F

Product Overview

This is a traditional reinforced kraft paper bitumen-bonded building paper laminate used within the construction industry which meets the requirements of BS 1521, grade B1F (Class B with reinforcement). Unlike many other recent developments in building membranes (eg breathable roof underlays), BS 1521 does not give guidence 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 B1F has naturally evolved over time including for example, separation layers for insulated screeds, bond breaks, temporary protection and garden buildings.

 

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Building PaperKey Features

  • Bitumen, paper and reinforcement scrim laminate
  • Lowest cost reinforced product
  • Roll sizes 1.25m x 50m and 1.8m x 50m *
  • Multi-use adaptable, generic building product

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*NB our 1.8m x 50m B1F product is called 509B, but it has a non-standard selvedge (or unfinished edge). For a fully compliant B1F grade, choose our 1.25m x 50m product which has a BS 1521 compliant cut edge.

 

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