ᐅ Garden stairs made from paved granite curbstones (edging stones)

Hello,
I have decided not to proceed with my initial plan to build a garden staircase using concrete block steps. An alternative that seems easier for me to implement is a staircase with paved edging stones.
The staircase has a total outer radius of about 4 m (13 feet), a turning angle of approximately 90°, a step width of around 1 m (3 feet), a riser height of about 15 cm (6 inches), and a tread depth of roughly 32 cm (13 inches) on the outer side and about 24 cm (9.5 inches) on the inner side. If I use granite edging stones as the front edge—approximately 100 x 20 x 8 cm (39 x 8 x 3 inches)—and pave the landing with granite cobblestones, could there be a risk that the edging stones might tip forward? Should I set everything in concrete?
Thanks in advance for the help.

Hello Holzwurm,

your reasoning is correct. Although it won’t slip forward immediately, heavy rain and pressure can loosen everything over time and possibly cause some shifting. Using concrete will provide a permanent solution that doesn’t require constant repairs.

Best regards
Sunny