Fire resistance comes from the assembly, not the panel alone.
SIPs rely on:
• OSB skins
• Foam core (EPS, XPS, PUR, PIR)
• Internal fire‑rated plasterboard (Type F / Fireline)
The gypsum board is the primary fire barrier.
Manufacturers and associations confirm that SIP assemblies meet or exceed building regulation requirements when correctly built up.
Typical fire‑rated build‑ups:
30‑minute rating
• 1 × 12.5 mm Type F (fire‑rated) plasterboard on battens
• Standard SIP core (EPS)
60‑minute rating
• 2 × 12.5 mm Type F plasterboard
• Standard SIP wall
This is consistent across UK, EU, and US testing.
SIPs are self‑extinguishing and fire‑retardant.
EPS foam used in SIPs is treated with flame retardants, and OSB contributes limited fuel.
Testing confirms SIPs are self‑extinguishing and fire‑resistant when used as part of a rated assembly.
Key standards SIPs comply with.
• BS 476‑21:1987 – Fire resistance of loadbearing elements
• EN 13501‑2:2016 – Fire resistance classification
• EN 1365‑1:2012 – Fire resistance tests for walls
• Eurocode 5 – Structural fire design
For a full contractors assembly, fire proofing and checklist, send us an email to:
info@gwp.ie