Waterproof concrete

[Squaredy]

On 18/05/2020 at 11:53, bobyboys said:

additives can be added to make conc into a DPC layer as some builds use this as the DPC where plastic cannot be used.

 

 

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I think paying the extra for waterproofed concrete is the way I will go.  It will cost £400 or so extra for the 6 cubic metres I will need, but I think that is worth it.  If it works.  Anyone got experience of this?

 

If you are wondering why I don't want to use a plastic DPM it is simply the extra difficulty of getting a good result when doing the pour at the corners and indeed everywhere the plastic sticks up.  I want to keep the pour as simple as possible - after all I don't want to get it wrong.

[dumper]

For the small cost that a few sheets of polystyrene would be I would include it, it would help to slow any great variations in temperature, nobody likes damp balls!

[Squaredy]

23 minutes ago, dumper said:

For the small cost that a few sheets of polystyrene would be I would include it, it would help to slow any great variations in temperature, nobody likes damp balls!

I may well put polythene dpm under the concrete but cut to fit not folded up into the corners, so hence still needing another method to keep the edges dry.  Def don't want damp balls....

[dumper]

The folds in the corners would be covered by the finish screed, sub base concrete polystyrene then screed, have you thought about the point loading of the legs maybe thicken the base round the legs you could then waterproof the screed at less cost

[Squaredy]

9 minutes ago, dumper said:

The folds in the corners would be covered by the finish screed, sub base concrete polystyrene then screed, have you thought about the point loading of the legs maybe thicken the base round the legs you could then waterproof the screed at less cost

I am not using a screed, just tamping the concrete then floating by hand.  Done it before and found it easy, and gives a much stronger surface of course as concrete is super strong.  Don't think the snooker table legs will be too heavy, weight of 160kg or so per leg should be fine I think.  I will be using mesh in the mix due to the size of the slab.  Appreciate your input.  Are you a snooker player?

[dumper]

No I spend a lot of time laying concrete all around the country

[Squaredy]

2 minutes ago, dumper said:

No I spend a lot of time laying concrete all around the country

Ah well as I said thank you for your input.  I will be putting pics up when I have something to show!  Not very exciting for you I realise, but I know getting the slab right is key to a simple and successful build.

[dumper]

With a bit of time and some double sided tape you can make some pretty good folds in the corners

[dumper]

What are you going to build in timber .?

[Squaredy]

2 minutes ago, dumper said:

What are you going to build in timber .?

I am going to build a garden room, which will have a snooker table in (possibly full size) and darts board and in the future who knows what else.