MCRP 12-10B.1, page 317

Reinforced Concrete Thickness of Material TNT C4 Size of Opening Up to 10 cm (4 inches) .792 lbs .591 lbs 10 to 15 cm (4 to 6 inches) 10 to 20 cm (4 to 8 inches) 3.4 lbs 2.54 lbs 15 to 30 cm (6 to 12 inches) Nonreinforced Concrete Masonry Thickness of Material TNT C4 Size of Opening Up to 35 cm (14 inches) 3.66 lbs 2.73 lbs 35 cm (14 inches) 35 to 45 cm (14 to 18 inches) 7.5 lbs 5.6 lbs 45 cm (18 inches) 45 to 50 cm (18 to 20 inches) 10.2 lbs 7.61 lbs 50 cm (20 inches) Table F-2. Amounts of TNT and C4 Required To Breach Concrete b. The engineers should furnish technical assistance for selective rubbling. Normally, buildings can be rubbled by using shaped charges or C4 on the supports and major beams. c. Charges should be placed directly against the surface to be breached unless a shaped charge is used. Whenever possible, demolitions should be tamped to increase their effectiveness. Tamping materials could be sandbags, rubble, or desks and chairs (Figure F-12). Figure F-12. Chair Used To Tamp Breaching Charge Military Operations on Urbanized Terrain F - 15