What percentage of the total length of side and rear property lines on which a firewall may be constructed on R-3 zoned properties, if the rear property line is 4 meters or less?

In R-3 zoned properties, the regulations for constructing firewalls depend on the length of the side and rear property lines. When the rear property line is 4 meters or less, it indicates a need for heightened fire safety measures. The correct answer, stating that a firewall may be constructed across 100% of the total length of the side and rear property lines, reflects an approach that prioritizes safety in residential zones by allowing full coverage.

This complies with building codes aimed at reducing fire risks in tightly spaced residential areas. By permitting firewalls along the entire length of these property boundaries, the regulations ensure that adjacent buildings are protected from the spread of fire, especially in neighborhoods where buildings may be in close proximity to one another.

Under such circumstances, restricting firewall construction to less than 100% would not adequately mitigate potential fire hazards, which is why the option specifying total length is established as the correct choice. Other percentages would not fulfill the critical safety requirements defined in the regulations for properties in proximity to each other.