How Long Should You Wait Before Waterproofing Over Screed?

A common question in the waterproofing world - 'How long should I wait before waterproofing over a screed?'
How dry is dry enough? Is there a difference for internally and externally?
All your questions are answered in this episode of Sealed For Good.
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[@jameshailwood007]

Great content on this channel. Fantastic effort lads

[@handyandie-morethanjusthan1462]

Great video. Having a measurable figure make sense and I am surprise that the code has been updated to reflected the common sense and more measurable approach. Taking a leaf out of the parquetry /vinyl flooring specialist, what is deem the acceptable level (on a moisture meter) ?

[@GripsetIndustriesPTYLtd]

Thanks for the feedback Andie! 8% maximum and 75%RH is about right for internal screeds as measured by carbide hygrometer. Typically screeds should be left for minimum 7 days. Externally screed moisture can vary with atmospheric and climatic conditions so may take shorter or longer to dry to these levels The other reason to leave screeds for this amount of time is that any compound with cement is subject to shrinkage and cracking. Any cracking should show up within this 7 day period allowing the contractor to treat/accommodate these during the membrane application. Otherwise cracking can permeate a membrane layer that is laid over.

[@shamismail4266]

So may I know what is the acceptable moisture level of the screed before we do waterproofing?

[@GripsetIndustriesPTYLtd]

For any concerns of residual moisture in the screed, refer to Gripset E60 or Xpress H20 vapour barrier primer's TDS

[@jameshailwood007]

What's your version of mapei's mapecem? Can waterproof after 24hrs with that in the screed. Does gripset have something similar?

[@GripsetIndustriesPTYLtd]

Hi James, thanks for the enquiry, Gripset do have a screed product called C- bed and you can waterproof over the C-bed and yes you can waterproof over the screed in 24hours base don normal standard conditions. Check out Gripset.com, view C-bed under products tab and you can read more details there. Thanks!

[@parwiznawabi2819]

Hey this is Peter toiling

[@jeffchapman1962]

Most of my clients watch the block .." they think you can strip out and fully renovated a bathroom in a week " or 3 days if they help you ...... hehe

[@sledgehammer301]

Do the clients cry a lot and say they are doing it for their kids?

[@georgedimitri7579]

Negative pressure membrane on screeds always

[@rezaaram7383]

Too many ads!!