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Moisture Assessment

Calcium Carbide Test

The retention of excessive moisture in screeds is a major problem that affects the quality and longevity of floors. As it is often difficult to predict the drying times accurately, it is always important to carry out a reliable moisture assessment test prior to the installation of the final finish. According to industry benchmarks, a standard traditional screed of 75mm thickness usually takes 110 days for optimal drying- provided good airflow and a controlled temperature of 20°C and Relative Humidity of 50% are maintained. This is however different for modified screeds, and may vary from one brand of screed to another.

Calcium Carbide Test

Calcium Carbide Test –

The moisture content of the screed is assessed by testing a sample of the screed using a carbide moisture meter. A sample of the screed is removed at approximately 50% of the screed depth, and the weight of the sample is measured accurately.  The removed screed sample is further mixed with a calcium carbide reagent and subjected to orbital rotation in a vacuum flask. The results are displayed on a pressure gauge as CM%. The test is relatively quick and easy to carry out, and yields accurate results. However, as the calcium carbide method is a destructive form of testing, minor remedial repairs would generally be necessary for the screed area from where the sample is removed.

As per the British Standards Code of Practice, the traditional hair hygrometer test is recommended for estimating the relative humidity in screeds. However, this is a time consuming process and is not a recommended test method for certain modified screeds that form a chemical bond with water.
As modified screeds are currently not covered in the British Standards Code of Practice, manufacturers generally prefer the Moisture Content Test for screeds, as these yield speedy and more accurate results.
The commonly used Moisture Content Test in screeds are:

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SCREED SYSTEMS

There are many products on the market and CSC have reached a high industry standard by fully understanding the science behind the installation and associated processes. We have worked very closely with our supply chain to ensure that only the best quality materials are used on all of our sites across the UK.

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These screed pumps are a mobile representation of our business. That’s why it’s so important that everything is clean and maintained to only the highest of standards. When you engage with CSC, you know exactly what to expect. #highstandards #dotherightthing #qualityandvalue #ukconstruction #constructionuk #cscscreeding ...

Over 2,600m2 of Isocrete K Screed on M Bond with a mechanically prepared concrete base for the H&M store in Milton Keynes. Due to site restrictions and the requirement for a narrow footprint along the rear service road, we are supplying the sand via grab loader and contained in a roll on, roll off skip. This methodology works perfectly with our Mörtel Meister screed pumps with hydraulic skip and remote control shovel. Well done team! Great work #cscscreeding #isocrete #cpguk #screedingmiltonkeynes #shoppingcentre #ukconstruction #constructionuk ...

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Mbond delivered and ready for redistribution to a new project in Oxford. We’ll be mechanically preparing the existing concrete slab, applying M Bond Extra and screeding with Isocrete Fast K. The area is circa 1800m2 and has a built in moveable racking system that will be used to archive documents produced in the college environment. Thank you to Morgan Sindall for entrusting CSC to deliver the project. #cscscreeding #cpguk #isocrete #approvedcontractor #flowcrete #screed #screeding #screedingoxford ...

Organisation is key to working in the screed business. Lots of bulk materials arriving to site, just in time. We always keep a reasonable level of stock to ensure we can top up as and when required. Keeping the operatives working with the minimum of downtime is the name of the game. ...

PP Fibres and Isocrete K Screed always at the ready for the CSC screed teams. It’s so important that we are prepared for all eventualities and that’s why we are always ready for work. #readyforwork #isocrete #cscscreeding #cscscreedteam #ppfibres ...

The team at CSC always carry stock of 1200g DPM and 500g separating membranes. We use these materials almost everyday of the week, so we’re always ready for work. #dpm #readyforwork #cscprepteam ...

We welcome Jacqueline to the accounts team. Having worked with Amanda for the last three months, Jacqueline is ready for the next chapter. Here’s to wishing you every success. 🎉🎉 ...

End of an era! Amanda’s last official day at CSC Screeding after 14 years. Enjoy your retirement and we wish you health and happiness. Thanks for everything, Amanda. Best wishes x ...

Service and annual vessel pressure test for three of our Mörtel Meister screed pumps. All certified and a clean bill of health. We go again….. #cscscreeding #screedcontractor #screeding #screed #mortelmeisteruk #service #certified ...

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CSC Screeding are members of Constructionline, CHAS and Builders Profile where a predefined Health & Safety questionnaire is pre-completed and our clients have direct access to the information. Documents contained in the pre-qualification system are updated throughout the year, ensuring continued compliance. We have focused on developing the business through constant innovation, implementation and collaboration. We are now ready for the business to grow with the increasing demand.