About GAFGLAS® Ply 4

Constructed with a strong glass fiber mat coated with the finest quality asphalt, this base sheet is designed with optimum porosity to assure a sound, watertight membrane. It has a high tensile strength and high degree of dimensional stability, resulting in a roof system with greater resistance to splitting and cracking. Typical system guarantees available for up to 15 years; select system constructions available with up to 20 year guarantee coverage.

  • Optimum felt porosity provides ready escape of air while allowing proper asphalt penetration at the time of mopping
  • Meets ASTM D-2178, Type IV specifications
  • Can be used in all climate zones Rolls out flat for easy installation  

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