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Ours are extremely steep, wooden with no runner. We used Osmo Polyx Anti Slip which makes a big difference, and also installed a handrail on the wall side. The latter is a huge help if you ever have anyone elderly or infirm to stay, regardless of how slippy the stairs are. Don't feel the need for a runner, with those.
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Thanks for the replies all. I think the issue is compounded by the fact that the staircase is quite fucking narrow too, which pretty much rules out a handrail. It seems like people is talking about sanded/treated floorboards rather than additional sheet(?) flooring (I have engineered oak downstairs)
How do you find wooden floor on the stairs? My stairs are quite steep (people always comment on this when they come round for the first time). I'd like to extend the downstairs wooden floor to stairsa nd landing but worry about potential for increased slippage. Did you consider this?