Articles | Technical
Can GIB Weatherline® substitute for GIB Fyreline®?
Tuesday, 28 October 2025
By Hans Gerlich
Since its introduction in 2019, GIB Weatherline® has expanded the perception of plasterboard beyond internal linings. It is now commonly used in applications exposed to the elements, including fire-rated systems.
GIB Weatherline® is suitable for use in fire-rated systems such as:
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External walls
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Parapets
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Soffits
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Wrapping beams and columns
For example, GIB Weatherline® wingwall specification GWSP60 requires a minimum of 92mm steel stud framing, ceramic coated GIB® Grabber® screws spaced at centres to satisfy wind loading and fire-resistance requirements, and GIB Weatherline® taped sheet joints, whilst GIB Fyreline® specification GBS 60 requires a minimum of 64mm steel stud framing, gold-passivated GIB® Grabber® screws, and plaster stopped joints.
Although these differences might seem minor, mixing and matching fasteners and/or joint treatment can lead to the specification of unverified systems.
Recommendations:
- Fasteners
Keep the systems intact and install GIB Weatherline® with the specified ceramic coated GIB® Grabber® screws, and GIB Fyreline® with gold-passivated GIB® Grabber® screws.
- Joint treatment
Page 18 of ‘GIB Weatherline® Rigid Air Barrier Systems, 2021’ describes when and how conventional stopping and painting of GIB Weatherline® can be carried out.
Page 14 of the ‘GIB® Site Guide, 2024’ allows substitution of GIB Weatherline® for GIB Aqualine®, including as a tiling substrate (follow the GIB Aqualine® instructions), but not as a direct substitute for 13mm GIB Fyreline®.
GIB® Helpline 0800 100 442
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