Can Weather Defence™ be used for steel encasements?
Weather DefenceTM is designed and tested as an external sheathing board for use within Siniat façade and Thruwall systems. It's intended application is as a sheathing board that provides temporary weather protection during construction, allowing internal works to progress while the external wall is still in progress.
Although Weather Defence™ is classified as a Type GM-F board, it has not been tested or assessed by Siniat for use in any fire‑protection steel encasement system. Siniat can only recommend uses that are supported by verified and certified system test data, we cannot recommend the use of Weather Defence™ for steel encasements or any fire‑resisting encasement application.
For applications requiring fire protection to structural steel, we do offer a fully tested and certified solutions:
PROMATECT®‑XS – Frameless EN‑tested System - Up to 60 Minutes Protection
A1 non‑combustible board (EN 13501‑1) designed specifically for fire protection of structural steel up to 600 mm deep, providing up to 60 minutes of fire resistance when installed as part of a tested system. It has been tested to EN standards, including bespoke junction testing carried out collaboratively by Siniat and Promat, ensuring validated performance at interfaces between steel encasements and partitions.
promatect‑xs – Siniat
promatect-xs - Promat
PROMATECT®‑250 — Up to 120 Minutes Protection
Designed to protect structural steel for up to 120 minutes, with suitability for beams and columns up to 1200 mm deep.
promatect‑250 – Promat
VERMICULUX®‑S — Up to 240 Minutes Protection
Provides up to 240 minutes fire protection and is suitable for beam and column depths up to 2000 mm.
vermiculux‑s – Promat
Structural Steel Guidance
Promat also publishes extensive guidance on steel encasement requirements and fire‑resistance durations as part of its Passive Fire Protection Handbook, which includes systems tested and classified to EN 13381‑4 and EN 1363‑1.
Passive Fire Protection Handbook - Promat
If you require support in selecting the appropriate Promat steel‑protection system, please contact Promat Technical Services
Phone: 01275377789 | Option 2
Email: Technical@promat.co.uk
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