concrete screed for wetroom installation

duchard · 8 Sep 2010

Hello, I am finally near to finishing off my new ground floor bathroom and I still have the wetroom floor to level before tiling commences. Since the wetroom area is all new build I have currently have the concrete slab left from the builders and I need to screed the rest in to make level with the existing ground level. A drain has already been put in place and I intend to use Impeys Aqua grade matrix around the drain to ensure I get accurate falls to the middle. My question is what to use for the screed?
The total area is 1.8m x 1.2m, so 2.16m2 in a depth of approx 110mm. So in all not a massive amount but enough to keep me busy. Would a self mixed screed be more suitable? I'm planning on doing it this weekend so just want to ensure Ive got enough mix before I begin.

Any suggestions much appreciated.

simonjay · 8 Sep 2010

duchard said:
Hello, I am finally near to finishing off my new ground floor bathroom and I still have the wetroom floor to level before tiling commences. Since the wetroom area is all new build I have currently have the concrete slab left from the builders and I need to screed the rest in to make level with the existing ground level. A drain has already been put in place and I intend to use Impeys Aqua grade matrix around the drain to ensure I get accurate falls to the middle. My question is what to use for the screed?
The total area is 1.8m x 1.2m, so 2.16m2 in a depth of approx 110mm. So in all not a massive amount but enough to keep me busy. Would a self mixed screed be more suitable? I'm planning on doing it this weekend so just want to ensure Ive got enough mix before I begin.

Any suggestions much appreciated.

Just sharp sand / cement, ratio 3:1 or 4:1.
You don't have to do it in one go. You can add SBR if you want the screed itself to be fully waterproof.
Buy bags of cement as required (B&Q is cheap)
Hire a cement mixer for the day.
As for the amount of sand, others may be able to help.
I always have a bulk bag of sand on hand !
Simon.

duchard · 8 Sep 2010

Thanks simonjay, although still not sure as to how many bags I'm going to need. If my sums are right i would need approx 2.4m3 in volume. Anyone know how many bags this would equate to?

I have used lafarge mortar mix before to bed into pipe lays which was easy enough and quite cheap at £3.50 a bag.

Jusy want to make sure I go for the easiest / semi-cheapest options before I start the unreversible. I will be tankng the area with BAL WP1 and marmox hardibacker boards so no need to waterproof the screed.

Thanks again

mointainwalker · 8 Sep 2010

Your calculation is wrong.

If you have an area of 2.16 m2 you would need to be putting down 1100 + mm to need 2.43 m3.

Decimal point wrong place ?

If it's 0.24 m3 that ought to be 350 - 400 kg

duchard · 9 Sep 2010

Ah defo not 1100mm but 110mm (11cm) depth

Thanks

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concrete screed for wetroom installation

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