Fire Resistance Wall Calculator
Determine wall construction specifications to achieve required fire resistance ratings per BS EN and Approved Document B.
Floor to ceiling height
Total wall length
How We Calculate This
This calculator determines the wall construction specification needed to achieve a target fire resistance rating, based on construction type, material properties and plasterboard selection.
How it works
- Blockwork: Thickness and density determine fire rating per BS EN 1996-1-2.
- Stud walls: Plasterboard type and layers determine rating per manufacturer tested details — see the British Gypsum WhiteBook Fire-Rated Systems section for certified specifications. Standard (Type A) plasterboard alone gives only 15-20 min; a true 30-min rating needs either FireLine (Type F) board or doubled standard board.
- Concrete: Thickness and cover determine rating per BS EN 1992-1-2.
- Insulation: Mineral wool in cavities improves stud wall performance.
Frequently Asked Questions
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Last updated: March 2026
All calculations are estimates. Verify with your supplier.