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Replacing a high raised decking with stone

velvet_rose1980velvet_rose1980 Posts: 26
edited August 2020 in Problem solving
Hello everyone, 

I've read a couple of previous forum chats on a similar subject, but would be grateful for any insight you can give me on my own specific situation. ☺️

I live in a Victorian terrace with a sloping garden, and it has a high decking platform with steps down to the garden. 

We have already cleared away all the rubble and soil that was packed underneath it - the aim was to move the steps to the other side, put a door through the breeze block wall (also clad with decking), and create a storage space underneath. It has waste pipes too under there.

However, neither my partner nor I much like the decking, and it's also gone tatty and soft in places.

How difficult would it be to replace the decking with sandstone or quarry tiles, and replace the set of steps with the same? Or can you even lay stone over essentially a cavity beneath? Has anyone used sleepers for steps instead? (Are they more durable than decking?) 


In short, has anyone done anything similar??

Many thanks for reading this long post. ☺️

PS Yes, it's a complete state!! 
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  • DovefromaboveDovefromabove Posts: 88,147
    I've not done this, so this is just off the top of my head, having had some experience with building projects.  

    My concern is that I think there would inevitibly be some flexibility in the joists supporting the surface, and I'm not sure how you could seal the joints between the pavers because of consequential movement.  

    Perhaps others with more experience have some ideas .................

    Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.





  • Thank you, yes, I did wonder that if we wanted a stone patio, we'd have to fill the whole thing in with concrete... 
  • K67K67 Posts: 2,506
    edited August 2020
    As you say you would have to fill it all in to support the weight of slabs. Wood moves and your slabs would be unsafe as you couldn't cement them down.
    You could use a composite non wood decking or a nice hardwood one.
    We did a whole flight of decking steps at my daughter's over 6 years ago and they are still in very good condition as they look after them. 
    We bought the wood from edecks and it has a non slip surface set into the tread as they are used to access the front door in all weathers 
    The problem with sleepers is making them non slip
  • DovefromaboveDovefromabove Posts: 88,147
    I've seen a really nice deck done with really good hardwood rather than the more generic 'decking'.  I think that's the way I'd go ... maybe get a good architect to suggest something 'interesting' ... definitely don't lose that storage space ... I'd give my eye teeth for that sort of storage. 

    Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.





  • tui34tui34 Posts: 3,493
    Good idea @velvet_rose1980    Quite right @Dovefromabove - don't forego that storage space!  If the wood on that wall is good (probably need reinforcing anyway) you could render it and insert an old wooden door then decorate it with slabs around the door frame.  Sleepers can be used as risers on the steps - boxed in with cement and laid with a nice stone on the step.   Just an opinion.
    A good hoeing is worth two waterings.

  • SydRoySydRoy Posts: 167
    Ok, a couple of alternatives. Get shut of all the decking..it's probably knackered anyway. Then instead of rebuilding as it is build a set of nice wide stone steps/railings right up against the patio doors onto a much lower decking or stone patio. The steps could be an L shape or even a slight curve if your clever enough. Or perhaps lower the new deck by half and have two sets of steps - firstly from the patio doors then onto the garden.
    Incidentally, you may want to look at your brickwork...I suspect it needs a bit of TLC.
    Good luck.
  • LoxleyLoxley Posts: 5,698
    You can lay slabs on a pedestal support system (up to about 800mm ht), but they have to be placed on a firm base such as a concrete slab. You would need to wall off the end of the 'deck' and the steps would need to be solidly constructed with a concrete substructure.

    See the source image



    It would be easier and cheaper to replace the deck and steps with composite decking, such as 'Millboard Enhanced Grain', which is more durable than timber decking and won't go green and tatty.
    "What is hateful to you, do not do to your neighbour". 
  • Hi everyone, thanks for your comments and ideas so far! I'll take a look at hardwood in a sec. @SydRoy - that sounds absolutely lovely, but I don't think we'd have the budget for that! Also not sure how we'd get to the pipes if we had to? ☺️ 
  • @K67, if you don't mind me asking just one more quick question - what are the gaps like between hardwood decking planks? Is it like interior wooden floors? We ideally wanted to make the cavity watertight from above. Sorry to trespass on your time again. 
  • K67K67 Posts: 2,506
    No you have to leave a gap between each plank as they expand and contract with the weather and temperature.
    Even inside on wood floors you leave an expansion gap around the edge, we thought we had left enough on one floor we laid only to come down one morning to find a large bumb in the floor!
    I would assume a composite deck wouldn't need this but you would need to check a sellers website for guidence.
    You could put exterior grade sterling board over the storage area under the joists. I would think you need an air gap between the decking and board to allow any moisture to evaporate.
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