Treads and risers are often wedged tightly in place. The wedges can loosen so the stair strikes and creaks. If this occurs, you need to rigorously verify all the steps, and perform any repairs obligatory, from beneath the steps if potential, or from above if not.
If the treads or risers break up, they are often changed in an open-string staircase. Remove the balusters and the fasteners from the broken tread or riser (fasteners are underneath the steps). Slide out the damaged half and use it as a template to chop a brand new one. Slip the brand new half into place and substitute the fasteners and balusters. You will want skilled assist to interchange treads or risers right into a closed-string staircase.
If the nosing of a tread is broken, it might typically be mounted with out eradicating the entire tread. Cut away the broken space and use it as a template to chop a brand new part. Then glue and screw the patch in place. This is a technique just like that used for window sills .