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How to build a deck on a sloped concrete slab?

Hi,

I’m hoping to build a deck on the concrete in my back yard that brings it up to level with the door (about 50mm above the slab) - the only problem is that the concrete slopes away from the door, so with my slightly limited decking knowledge, I’m trying to figure out how to create a completely level deck on the slope when I didn’t have a lot in the way of vertical distance to bring it up to level.

Hoping someone can offer some advice 🙂

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Comments

Dave-1

Good Evening @Kippix

I am afraid 50mm is too low for a deck to be built 😕 Tho I have seen a solution that may be doable and for you in particular with your slab. Do you know how much fall is on it? If you dont then using a flat straight edge, mark 1m from the end of it. Then place a level on the timber, once you have the air bubble in the middle of the level, Measure the distance from the 1m bottom part of the straight edge to the concrete. It looks like it may be round 20-30mm per 1m which isnt steep.

Outdoor tiles & flooring from Ikea. I havnt seen anything like this at Bunnings as yet 🙂 The only thing I would suggest with your pebblecrete coated slab is maybe try a few to see how it feels over pebblecrete itself. In store it feels nice to walk on and its been there for ages for thousands of people trapsing over it.

Dave

JacobZ

Hi @Kippix,

A warm welcome to the Bunnings Workshop community, it is fantastic to have you with us.

Unfortunately, as @Dave-1 has already said, 50mm is not enough space to build a deck that is flush with the height of the door.

If you were willing to remove the concrete and with it some of the soil, you could build a low-level deck that is flush with the internal flooring, but without doing so, unfortunately, this is not a viable option.

If you were happy to have a step up from the door, you could build a deck, but its life would be very reduced due to the proximity to the concrete and the lack of ventilation beneath it.

You could pave over the top of the concrete, using compacted Paving Sand to level the surface. This would allow for drainage and the pavers would not rot like a deck would.

Let me know what you think.

Jacob

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