Type 1 Storage Requirements & Specifications for Approved Storage Regulations

Type-1 Storage Requirements

Type 1 Storage Magazines for approved storage. Get prices and pricing for budgetary purposes from KL Security

High explosives (including blasting caps, detonating cord, dynamite, shaped charges, boosters, etc.) must be stored in ​Type-1​ permanent magazines. Blasting agents stored ​with high explosives must be stored in ​Type-1​ or Type-2 magazine. Low explosives must be stored in Type-1​, -2, or -4 magazines.

Type-1​ permanent magazines must be:

  • Bullet-resistant
  • Fire-resistant
  • Weather-resistant
  • Theft-resistant
  • Inspected at least once ​every 7 days

Type-1 Storage Specifications

  • Locations of Outdoor Magazines
    • No closer to inhabited buildings, passenger railways, public highways, or other magazines than minimum distances specified in Tables of Distances


  • Locations of Indoor Magazines
    • May not be located in a residence or dwelling
  • Vehicular Magazines (used only for low explosive storage)
    • Immobilize by removing wheels or installing a kingpin locking device when unattended


Type-1 Housekeeping and Construction

  • Hinges and hasps must be installed so that they cannot be removed when doors are closed and locked. They must be attached to doors by:
    • Welding, Riveting, or Bolting (nuts inside door)
  • Locks must be protected by ¼″ steel hoods to prevent theft. This doesn’t apply to doors secured on inside via bolt, lock, or bar that cannot be actuated from the outside. Each door must have:
    • 2 mortise locks

○  2 padlocks fastened in separate hasps & staples

■    Padlocks must have at least 5 tumblers and casehardened shackles (at least a 3/8″ diameter)

○           A combination of mortise lock and padlock

○      A mortise lock requiring 2 keys; or a 3-point lock

  • Lighting must meet National Electrical Code and/or NFPA 70-81 standards
    • Electrical switches and wiring must be located outside of the magazine

■   Battery-activated safety lights or lanterns are acceptable

  • Ground must slope away for drainage or provide other acceptable means for drainage
  • Magazines must be clean, dry, and free of grit, paper, empty packages/containers and trash
  • Spark-producing utensils cannot be stored in magazine
  • Explosive leakage stains must be cleaned
  • Deteriorated explosives must be destroyed per manufacturer instructions
  • The surrounding area must be kept clear of trash, brush, dry grass, or trees (less than 10′ tall), for no less than 25′ radius
  • Volatile materials must be kept at least 50′ away from outdoor magazines ● Live foliage to stabilize an earthen covering is acceptable



Item Requirements
Foundation Brick, concrete, cement block, stone, or wood posts. If piers or posts are used in lieu of continuous foundation, the space under buildings must be enclosed with metal.



Strong enough to bear maximum storage weight and non-sparking (pallets constructed of, or covered with, non-sparking material is acceptable).


Masonry Wall Brick, concrete, tile, cement block, or cinder block no less than 6” thick. Hollow masonry spaces filled with well-tamped, coarse, dry sand or weak concrete (1 part cement to 8 parts sand with water to dampen while tamping).
Metal Wall Fabricated sectional sheet steel or aluminum (no less than 14-gauge) securely fastened to metal framework. Interior walls lined with brick, solid cement blocks, hardwood (no less than 4” thick) or at least 6” sand fill between interior and exterior walls.
Interior Walls (Masonry and metal walls) Constructed of, or covered with, non-sparking material. Ferrous metal nails in floor and walls must be blind nailed, countersunk, or covered  with non-sparking material.
Wood Wall Exterior walls must be covered with iron or aluminum no less than 26-gauge. Inner walls must be covered with non-sparking material constructed to provide at least 6″ space between outer and inner walls. Space filled with coarse dry sand or weak concrete.
Ventilation (no openings except for entrances and ventilation)



Ventilation must be provided to prevent dampness and heating of explosives. Vent openings must be screened. Openings in side walls and foundations must be offset or shielded for bullet-resistance. Magazines with foundation and roof ventilators with air circulating between side walls and floors, or


side walls and ceiling must have a wooden lattice lining (or equivalent) to prevent stacking explosives against walls.
Roof (bullet-resistant ceiling /roof) For buildings without fabricated metal roofs, outer roof must be covered with no less than 26-guage iron or aluminum, fastened to at least 7/8″ sheathing.


If a bullet could be fired directly through the roof into magazine at an angle to strike explosives, the roof must:

●      Include a sand tray lined with a layer of nonporous material, filled with at least 4″ coarse, dry sand—located at tops of inner walls covering entire ceiling area (except ventilation); or

●      Be a fabricated metal roof of 3/16″ plate steel lined with 4″ hardwood. (For each additional 1/6″ plate steel, hardwood lining may be decreased by


●      For roofs not of fabricated metal, outer roof must be covered with no less than 26-guage iron or aluminum, fastened to at least 7/8″ sheathing.

Doors Must be constructed of at least ¼″ plate steel and lined with at least 2″ hardwood
Igloo, “Army-type structure”, tunnel, and dugout Must be built of reinforced concrete, metal, masonry, or combination. If not bullet- resistant, must have earth mound covering of
at least 24” on top, sides and rear. Interior walls and floors must be constructed of, or covered with, non-sparking material.

Sources: ATF Publication 5400.17 (May 2016) and atf.gov.

© 2018 K.L. Security.