8) Ministerial Decree 14 June 1989 No. 236

Technical requirements necessary to ensure accessibility, adaptability and visibility of private buildings and public housing, subsidized and facilitated, for the purpose of overcoming and eliminating architectural barriers. whose text can be consulted in full on the website of the Ministry of Infrastructure and Transport at: www.mit.gov.it

8.1.8 Balconies and terraces

• The parapet shall have a minimum height of 100 cm and be inattravable by a ball of 10 cm in diameter.
• To allow for change in direction, balconies and terraces must have at least one space within which a circumference of 140 cm can be inscribed.

8.1.10 Stairs

• Stair rails, which are common or public use, must have a minimum width of 1.20 m, having a limited and constant slope for the entire development of the staircase;
• The steps must be characterized by a correct relationship between lifting and treading (minimum footing of 30 cm): the sum between the double of the lift and the peda must be between 62/64 cm;
• The profile of the step preferably has a continuous design with rounded edges, with a sloping subgrade with respect to the degree, and forming with it an angle of about 75 ° -80 °;
• In the case of a discontinuous design, the degree of grip relative to the subgrade must be between a minimum of 2 cm and a maximum of 2.5 cm;
• A signal to the floor (different material range or perceptible by the blind), located at least 30 cm from the first and last step, must indicate the start and end of the ramp;
• "The guard against the void must have a minimum height of 1.00 m and be invertable by a ball of 10" diameter;
• At breaks in the handrail, this must be 30 cm longer than the first and the last step;
• The handrail must be placed at a height between 0.90 / 1 meter;
• Where a second handrail is to be provided, this shall be placed at a height of 0,75 m;
• The railing on a parapet or full wall must be at least 4 cm away from them;
• Stair rails, which are not common parts or are not of public use, must have a minimum width of 0,80 m;
• In this case, however, the above-mentioned relationship between lifting and tilting (in this case minimum 25 cm) must be respected, and the minimum height of the parapet;