Step width in the central part should not be less than 20-25 cm at the widest part - nor more than 40 cm. Spiral staircase step height can be greater than the height recommended for mid-flight of stairs. Normal step height for straight stairs is 16 cm, for spiral stairs - 18 cm
Hatua ya upana katika sehemu kuu lazima si chini ya 20-25 cm katika sehemu ya widest - si zaidi ya 40 cm Ond staircase hatua urefu unaweza kuwa mkubwa kuliko urefu ilipendekeza kwa ndege ya katikati ya ngazi. Kawaida kwa ajili ya hatua ya urefu floating ni 16 cm kwa screw - 18 cm