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How long do i have to wait before tiling over fresh concrete?

10 Answers from MyBuilder Tilers

Best Answer

In warm and well ventilated drying conditions allow 1 day per millimetre up to 40mm in thickness, so 40 days if 40mm. Thicker substrates require 2 days per mm.

Use reputable flexible adhesive for tiling on screeds and concrete and as per the manufacturers specifications, DO NOT USE PVA but a latex based primer if the concrete surface is shedding dusty, fine particles after drying.


Answered 20th Aug 2011

PVA PVA stop letting builders tell the public to pva anything!!!!! its not compatible, Acrylic primers yes , apd, primer etc!!!


Answered 5th Sep 2011

Hi Emlyn,i would recommend you leave it at least 28 days,as you need to allow all the moisture to escape.Otherwise when you tile it will trap the moisture in,resulting with your tiles lifting.
Thanks Steve.


Answered 17th Aug 2011

I would leave it minimum 6 weeks.


Answered 17th Aug 2011

Never ever use PVA....when Tiling


Answered 11th Jan 2018

Concrete takes aong Time to dry fully out depending on the thickness usually you should be able to tile after a few weeks.


Answered 17th Aug 2011

48 hours should be ok


Answered 17th Aug 2011

Usually 48 hours depending on how deep it goes. Dont forget to seal the floor with PVA before applying any tile adhesive and use a good quality adhesive for your tiles.


Answered 17th Aug 2011

minium 4 weeks depending on thickness


Answered 17th Aug 2011

Newly-laid cementitious screeds and concrete contain relatively large amounts of water, which need to be retained while the cement binder is gaining strength.
Full strength may not be achieved for a period of 28days♨️but screeds should be kept moist for at least 7days ⚠️ to allow sufficient strength gain before drying is allowed. After this period, retained water needs to evaporate away until a normal moisture content is reached. During this time shrinkage occurs to compensate for the volume loss of water.
Tiling a screed too soon whilst the substrate is still stabilising can result in tiles blowing away from their base (heaving) as the screed shrinks below. Concrete substrates take far longer to reach stable equilibrium than sand and cement screeds due to their greater thickness.

Hope this helps!


Answered 3rd Nov 2018

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