Base material

• Solid Brick (Use category B)
• Solid Sand-lime Brick (Use category B)
• Hollow Sand-lime Brick (Use category C)
• Hollow Brick (Use category C)
• Hollow Lightweight Concrete Block (Use category D)
• Aerated Concrete Block (Use category D)
• Concrete ≥ C12/15 (Use category A)
• Cracked concrete ≥ C12/15 (Use category A)