HS Butyl GCA is a high-performance butyl tape designed for use in steel and aluminium roofing systems. It provides a long-lasting, airtight seal that supports compliance with building regulations approved document part L Standard. Suitable for cladding, flashings, and ridge tiles, it offers good adhesion to steel and other compatible surfaces, ensuring durable sealing in roofing applications.

Product Type: Tape

Application Area: Caisson Rings, Cladding, Flashings, Water Tanks

Compatible Substrates & Surfaces: Aluminum, Metal, Steel

Features: Excellent Service Life, Good Adhesion, High Performance, High Tack

Technical Data Sheet
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Enhanced TDS

Identification & Functionality

Features & Benefits

Ready-to-Use Product Features
Product Features
  • 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.

Applications & Uses

Markets
Applications
Application Area
Compatible Substrates & Surfaces
Product Application
  • 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.
Application Instructions

Surface preparation

  • All surfaces should be clean, dry, and free from frost, grease, and loose materials.

Application

  • Apply directly from the reel onto one surface and press along its entire length to ensure good initial adhesion.

  • Remove the backing paper, position the other surface onto the sealant, and push firmly to seal across the joint.

Properties

Performance Properties
ValueUnitsTest Method / Conditions
Dynamic Tensile Adhesion30N/cm²H5
Dynamic Shear Adhesion12N/cm²H15
90° Peel Adhesion7N/cmH48
180° Peel Adhesion14N/cmH41
Moisture Vapour Transmission Rate0.15g/m²/24hr/mmISO 9932 / BS ISO 15106
Service Temperature Range-40 to +110°C-
Application Properties
ValueUnitsTest Method / Conditions
Application Temperature Range5 - 40°C-
Product Tolerance

Rectangular sections:

  • Thickness: ±10%

Width:

  • Up to 25mm: ±1mm
  • 26mm to 100mm: ±2mm

Bead sections:

  • Thickness: ±10%
  • Width: ±10%

Regulatory & Compliance

Certifications & Compliance

Packaging & Availability

Regional Availability
  • Global
Packaging Information
  • 5mm x 6mm (9.6m) – 30 reels
  • 3mm x 9mm (15m) – 24 reels
  • 1.5mm x 9mm (30m) – 24 reels
  • 4mm bead (12m) – 30 reels
  • 6mm bead (8m) – 24 reels
  • 8mm bead (6m) – 20 reels
  • 3mm x 19mm (15m) – 14 reels
  • 3mm x 50mm (15m) – 6 reels
  • 6mm x 50mm (5m) – 6 reels

Storage & Handling

Shelf Life
24 months
Storage Condition

24 months when stored flat in original packaging in cool, dry conditions.