Sanding and refinishing worn stair treads
Written by Scott Jones, The Stair Guys, independent staircase measuring and sourcing specialists·Last updated
Stairs take more wear than almost any floor in the house, so tired, scuffed treads are common and, more often than not, fixable. If the timber is sound, sanding it back and refinishing can take years off a staircase for very little outlay. The trick is knowing when it is worth it, and doing it safely, because old stairs hide one genuine hazard.
Can it be saved?
Sanding cures surface wear: scuffs, tired finish, light scratches, ingrained dirt. It does not cure damage. If a tread is split, has worn hollow or right through, or flexes and moves when you stand on it, sanding only makes a weak tread thinner. That is a repair or a replacement, not a refinish, and if the movement comes with a creak the fixing a squeaky stair page covers the joint side of it. Sound but shabby is the sweet spot for sanding.
Sanding the treads
Assuming the timber is sound and any lead question is dealt with, the job itself is straightforward but fiddly, because a staircase is all edges and corners.
- Clear and protect. Lift any carpet, pull old gripper and staples, and mask off walls, spindles and risers you are not touching.
- Work through the grits. Start coarse enough to cut the old finish, then step down through medium to fine, so each grit removes the scratches of the last. Rushing the grits is the usual reason a finished tread still looks scratched.
- Mind the nosing. The rounded front edge is where wear shows and where it is easiest to sand a flat or a dip. Ease it by hand, keep the shape, and do not lean the machine on it.
- Get into the corners. A detail or corner sander, or careful hand work, deals with the back of the tread and the angle against the riser and string.
- Vacuum and wipe down thoroughly between grits and before finishing, because any dust left behind ends up under the finish.
Refinishing
Once the treads are bare, clean and dust-free, they are refinished the same way as new ones. Which product to use, oil, hardwax oil, varnish or lacquer, and how they compare on durability and look, is covered on the finishes page, and the same page covers keeping treads slip-resistant, which matters most on a stair. If you would rather go opaque than clear, the paint-versus-stain trade-off is on the paint or stain page. Do the treads last, and plan how you will get up and down while the finish cures.
Frequently asked
Can you sand and refinish stair treads?+
Yes, if the timber is sound. Sanding cures surface wear, scuffs, tired finish and ingrained dirt, and refinishing afterwards can take years off a staircase cheaply. It does not fix damage: a split, worn-through or moving tread needs repair or replacement, not sanding. Work through the grits, take care of the nosing and corners, and finish with oil, varnish or lacquer.
Is it safe to sand old painted stairs?+
Take care. Homes painted before about 1960 may have lead in the old paint layers, and sanding turns that into hazardous dust, which is a particular risk around children and pregnant women. Test old paint with a lead test kit first, and if lead is present use dust-free methods or proper precautions. If in doubt, get advice rather than sanding blind.
Should I refinish or replace worn stairs?+
Refinish if the timber is sound but shabby. Replace or repair if treads are split, worn through, or moving underfoot, because sanding a damaged tread only makes it weaker. A good test is to stand on each tread: solid but scruffy is a refinishing job, while flex, movement or a persistent creak points to a repair.
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