Civil engineer guide to fighting positions, shelters, obstacles

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AFH 10-222 Volume 14 1 August 2008 142 A2.4. Table A2.2, extracted from FM 5-103, contains required thickness for materials to protect against projectiles. Except where indicated, the thickness of material shown can protect a target from a single strike from the weapon specified. If intelligence indicates the enemy may be capable of placing multiple projectiles upon an individual target or certain area, the thicknesses indicated in the table should be doubled. Refer to the JCOB and JFOB Force Protection Handbooks for additional information on the use of available materials to construct expedient fortifications in the expeditionary environment. Table A2.2. Material Thickness for Protection Against Projectiles. Material Thickness in Inches Small Caliber Machine Gun- From 100 Yards Antitank Rifle - From 100 Yards 20mm Antitank Round - From 200 Yards Solid Walls 37mm Antitank Round - From 400 Yards 50mm Antitank Round – From 400 Yards 75mm Round- From 500 to 1000 Yards Brick Masonry 18 24 30 60 NR NR 1 Unreinforced Concrete 12 18 24 42 48 54 1 Reinforced Concrete 6 12 18 36 42 48 2 Stone Masonry 12 18 30 42 54 60 3 Timber 36 60 NR NR NR NR 3 Lumber 24 36 48 NR NR NR 3 Structurally Supported Materials Brick Rubble 12 24 30 60 70 NR Dry Clay 36 48 NR NR NR NR 4 Gravel and Small Crushed Rock 12 24 30 60 70 NR Dry Loam 24 36 48 NR NR NR 5 Dry Sand 12 24 30 Sandbags 60 70 NR 4 Brick Rubble 20 30 30 60 70 NR Dry Clay 40 60 NR NR NR NR 4 Gravel and Small Crushed Rock 20 30 30 60 70 NR Dry Loam 30 50 60 NR NR NR 5 Dry Sand 20 30 30 Loose Parapets 60 70 NR 4 Note
AFH 10-222 Volume 14 1 August 2008 143 Material Thickness in Inches Small Caliber Machine Gun- From 100 Yards Antitank Rifle - From 100 Yards 20mm Antitank Round - From 200 Yards 37mm Antitank Round - From 400 Yards 50mm Antitank Round – From 400 Yards 75mm Note Round- From 500 to 1000 Yards Clay 42 60 NR NR NR NR 4 Loam 36 48 60 NR NR NR 5 Sand 24 36 48 NR NR NR 4 Frozen Snow Frozen Soil Ice + Aggregate 80 24 18 80 24 18 Snow and Ice NR NR NR NR NR NR NR NR NR NR NR NR Tamped Snow Unpacked Snow 72 180 72 180 NR NR NR NR NR NR NR NR 1 – Plain formed concrete walls 2 – Reinforced with steel 3 – Guidance only 4 – Double the thickness when wet 5 – Add 50% to thickness when wet 6 – Thickness to nearest ½ ft 7 – 3,000 psi concrete Notes
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AIR FORCE HANDBOOK 10-222, VOLUME 1
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BY ORDER OF THE AIR FORCE HANDBOOK
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Civil engineer guide to fighting positions, shelters, obstacles

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