(1) Exterior, doors, and top openings.
(a) The exterior and doors must be constructed of at least 1/4-inch steel and lined with a minimum of three-inch hardwood.
(b) Magazines with top openings must have lids with water resistant seals or lids that overlap the sides by a minimum of one inch when closed.
(2) Hinges and hasps. Hinges and hasps must be installed so they cannot be removed when the doors are closed and locked by:
(a) Welding;
(b) Riveting; or
(c) Bolting nuts on the inside of the door.
(3) Locks.
(a) Each door must be equipped with:
(i) Two mortise locks;
(ii) Two padlocks fastened in separate hasps and staples;
(iii) A combination of mortise lock and a padlock;
(iv) A mortise lock that requires two keys to open; or
(v) A three-point lock.
(b) Padlocks must have:
(i) A minimum of five tumblers and a case hardened shackle with a minimum of 3/8-inch diameter;
(ii) A minimum of 1/4-inch steel hoods constructed to prevent sawing or lever action on the locks, hasps, and staples.
Note: | These requirements do not apply to magazine doors that are adequately secured on the inside by means of a bolt, lock, or bar that cannot be operated from the outside. |
(4) Ventilation.
(a) A two-inch air space must be left around ceilings and the perimeter of floors, except at doorways;
(b) Foundation ventilators must be at least four inches by six inches;
(c) Vents in the foundation, roof, or gables must be screened and offset.
(5) Exposed metal.
(a) Sparking metal cannot be exposed below the top of walls in the storage facilities;
(b) All nails must be blind nailed, countersunk, or nonsparking.
Note: | The following are nonmandatory construction alternatives for magazine exteriors: |
| 1. All steel and wood dimensions shown are actual thickness; |
| 2. The manufacturer's represented thickness may be used to meet the concrete block and brick dimensions. |
3/16
(c) 3/16-inch steel lined with an interior of 4-inch hardwood.
(d) 3/16-inch steel lined with:
(i) An interior of 7 inches of softwood; or
(ii) 6 3/4 inches of plywood.
(e) 3/16-inch steel lined with:
(i) An intermediate layer of 3-inch hardwood; and
(ii) An interior lining of 3/4-inch plywood.
1/8
(f) 1/8-inch steel lined with an interior of 5-inch hardwood.
(g) 1/8-inch steel lined with an interior of 9-inch softwood.
(h) 1/8-inch steel lined with:
(i) An intermediate layer of 4-inch hardwood; and
(ii) An interior lining of 3/4-inch plywood.
(i) Reserved.
(j) 1/8-inch steel lined with:
(i) A first intermediate layer of 3/4-inch plywood;
(ii) A second intermediate layer of 3 5/8 inches well-tamped dry sand; or
(iii) Sand/cement mixture.
(6) An interior lining of 3/4-inch plywood.
(a) 5/8-inch steel lined with an interior of any type of nonsparking material.
(b) 1/2-inch steel lined with an interior of at least 3/8-inch plywood.
(c) 3/8-inch steel lined with an interior of 2-inch hardwood.
(d) 3/8-inch steel lined with an interior of:
(i) 3 inches softwood; or
(ii) 2 1/4 inches of plywood.
(e) 1/4-inch steel lined with:
(i) An interior of 5 inches of softwood; or
(ii) 5 1/4 inches of plywood.
(f) Any type of structurally sound fire resistant material lined with:
(i) An intermediate layer of 4-inch solid concrete block; or
(ii) 4-inch solid brick or concrete; and
(iii) An interior lining of 1/2-inch plywood placed securely against the masonry lining.
(g) Standard 8-inch concrete block with voids filled with well tamped sand/cement mixture.
(h) Standard 8-inch solid brick.
(i) Reserved.
(j) Any type of structurally sound fire resistant material lined with an intermediate 6-inch space filled with:
(i) Well tamped dry sand; or
(ii) Well tamped sand/cement mixture.
(k) Any type of fire resistant material lined with:
(i) A first intermediate layer of 3/4-inch plywood;
(ii) A second intermediate layer of 3 5/8-inch well tamped dry sand; or
(iii) Sand/cement mixture;
(iv) A third intermediate layer of 3/4-inch plywood;
(v) A fourth intermediate layer of 2-inch hardwood; or
(vi) 14 gauge steel and an interior lining of 3/4-inch plywood;
(vii) 8-inch thick solid concrete.