High performance tape (NFRC Class A)


GCA® is a high performance butyl tape suitable
for use in steel and aluminium roofing systems.

  • External Metal Sheeting – sealing end and side laps in steel and aluminium
  • Roofing systems
  • Metal Liner Sheeting – sealing end laps
  • Sealing rooflights
  • Sealing metal flashings
  • Ridge and eaves sealing in combination with foam fillers
  • Sealing penetrations to roof and wall cladding


  • 25 year warranty (UK & Ireland only)
  • Outstanding service life
  • High tack product, providing excellent adhesion
  • Excellent track record of proven performance
  • Strong, flexible and designed specifically to accommodate movement
  • Provides a long-life, airtight seal to help buildings comply with Building Regulations
  • NFRC Technical Bulletin 36 Class A Rated – 3rd Party Accreditation


Unit Nominal Value Test Method
Dynamic Tensile Adhesion N/cm2 30 H5
Dynamic Shear Adhesion N/cm2 12 H15
90° Peel Adhesion N/cm 7 H48
180° Peel Adhesion N/cm 14 H41
Specific Gravity g/cm3 1.6 H6
Moisture Vapour Transmission Rate g/m2/24hr/mm 0.15 ISO9932 / BS ISO 15106
Service Temperature Range °C -40 to +110
H = HS Butyl Test Method

Premium Quality Sealants

Our skilled sister company, Hodgson Sealants manufacture a wealth of premium industry-leading adhesives, sealants and tapes.