Securely fasten the treads of a staircase and their vertical counterparts, the risers, to the structural support element or elements of the stair. Screw or nail the risers and treads onto the structure, like stringers, carriages or I-beam. Use adhesives to prevent creaking if called for.
DADOS FORNECIDOS PELA ESCO (COMISSÃO EUROPEIA) E O*NET (DEPARTAMENTO DO TRABALHO DOS EUA)