Iko Glass Fibre Underlay (Formally Type 3B) 20 x 1m

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  • Regular price £86.80

A waterproofing membrane, manufactured to BS 747 Type 3B, consisting of a strong glass fibre base coated with oxidised bitumen.


  • This product is used as an economical underlay (or intermediate layer) in a built-up felt roofing specification, and is usually fully bonded in hot bitumen
  • It is also used as an underlay to bitumen shingles in a pitched roof application
  • Straightforward installation using standard hot bitumen bonding