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  2. Defensible space (fire control) - Wikipedia

    en.wikipedia.org/wiki/Defensible_space_(fire...

    Grass height should not exceed 4 inches (10 cm). Trees should be 10 feet away from each other on a flat to mild slope but should be double that on a mild to moderate slope. Shrubs should be as far away as twice its height for flat to mid-slope but four times its height for mild to moderate slope.

  3. Defensive wall - Wikipedia

    en.wikipedia.org/wiki/Defensive_wall

    In Europe the height of wall construction was reached under the Roman Empire, whose walls often reached 10 metres (33 ft) in height, the same as many Chinese city walls, but were only 1.5 to 2.5 metres (4 ft 11 in to 8 ft 2 in) thick. Rome's Servian Walls reached 3.6 and 4 metres (12 and 13 ft) in thickness and 6 to 10 metres (20 to 33 ft) in ...

  4. Firewall (construction) - Wikipedia

    en.wikipedia.org/wiki/Firewall_(construction)

    A fire barrier wall, or a fire partition, is a fire-rated wall assembly that are not structurally self-sufficient. [ 2 ] Fire barrier walls are typically continuous from an exterior wall to an exterior wall, or from a floor below to a floor or roof above, or from one fire barrier wall to another fire barrier wall, having a fire resistance ...

  5. Ha-ha - Wikipedia

    en.wikipedia.org/wiki/Ha-ha

    Comparison of a ha-ha (top) and a regular wall (bottom). Both walls prevent access, but one does not block the view looking outward. A ha-ha (French: hâ-hâ [a a] ⓘ or saut de loup [so də lu] ⓘ), also known as a sunk fence, blind fence, ditch and fence, deer wall, or foss, is a recessed landscape design element that creates a vertical barrier (particularly on one side) while preserving ...

  6. High-voltage transformer fire barriers - Wikipedia

    en.wikipedia.org/wiki/High-voltage_transformer...

    The primary North American document that deals with outdoor high-voltage transformer fire barriers is NFPA 850. [1] NFPA 850 outlines that outdoor oil-insulated transformers should be separated from adjacent structures and from each other by firewalls, spatial separation, or other approved means for the purpose of limiting the damage and potential spread of fire from a transformer failure.

  7. Orders of magnitude (length) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(length)

    An adult human foot is about 28 cm (11 in) long. The decimetre ( SI symbol: dm ) is a unit of length in the metric system equal to 10 −1 metres ( ⁠ 1 / 10 ⁠ m = 0.1 m ). To help compare different orders of magnitude , this section lists lengths between 10 centimeters and 100 centimeters (10 −1 meter and 1 meter).

  8. Meryl Streep Had to ‘Cut a Car-Sized Hole’ in Her Fence and ...

    www.aol.com/meryl-streep-had-cut-car-145152876.html

    Meryl Streep’s nephew Abe revealed in a New York Magazine report that the Oscar-winning actor had to a cut a “car-size hole” in her fence in order to evacuate the Los Angeles wildfires ...

  9. Hadrian's Wall - Wikipedia

    en.wikipedia.org/wiki/Hadrian's_Wall

    A view of Hadrian's Wall showing its length and height. The upright stones on top of it are modern, to deter people from walking on it. Hadrian's Wall (Latin: Vallum Hadriani, also known as the Roman Wall, Picts' Wall, or Vallum Aelium in Latin) is a former defensive fortification of the Roman province of Britannia, begun in AD 122 in the reign of the Emperor Hadrian. [1]