Insulation Board Calculator
Calculate boards needed for floors, walls, and lofts.
UKUK Building Regulations
References & Sources
Standards Cited
- Building Regulations Approved Document L — Conservation of fuel and power
Sets minimum U-value requirements that determine insulation thickness choices (50-200mm) View → - BS EN 13162 — Thermal insulation products for buildings — Factory made mineral wool (MW) products
Defines standard mineral wool board sizes and thermal performance specifications
Formulas Used
- Board area:
boardAreaM2 = (boardWidth / 1000) x (boardLength / 1000)
Source: Basic geometry — Common sizes: 600x1200mm (0.72 m2), 1200x2400mm (2.88 m2) - Boards required:
boardsRequired = ceil(area / boardAreaM2)
Source: Standard quantity calculation - Boards with wastage:
boardsWithWastage = ceil(boardsRequired x (1 + wastage/100))
Source: Industry standard practice
Key Assumptions
- Standard board sizes: 600x1200mm for lofts, 1200x2400mm for floors/walls — BS EN 13162 / manufacturer catalogues (Celotex, Kingspan, Knauf, Rockwool)
- Common thickness range: 50-100mm for internal walls, 100-200mm for lofts — Building Regulations Approved Document L
- Typical wastage allowance of 5-10% for cutting and fitting — Industry standard practice