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I take it there isn't some magic composite decking which doesn't rot/mould/slip warp? Even if spendy? I want to do something and never deal with repairs again while I live here. Have been looking on youtube and building over the steps seems a possibility with some kind of stone-ish panels.
CYOA-
I think that depending on the space available and layout it may well be quicker and cheaper to build an entirely new flight over the old concrete one - independently so that water/yard grot can move between the two.
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Trex composite decking is very durable.
Something similar should be available in UK.
Often used to build steps right on top of old damaged concrete steps. -
Decking isn’t great for stairs. Outdoor rated tiles or paving will always outgrip it.
Composite decking…I’m suspicious of it. I thinks it’s for people who don’t understand how to treat and maintain wood or don’t want to.
That said, concrete and wood don’t really mix well if in direct contact; the concrete collects moisture and transfers it to the wood, with predictable results.
Dugtheslug
davidual
Howard
Could tile it or pave it instead. Decking has its issues as you’ve discovered.