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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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- New A & E Department, Wexham Park HospitalMarc McAdam2019-11-26T14:14:52+00:00
New A & E Department, Wexham Park Hospital
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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THE SCREEDER’S JOURNAL
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The first 500m2 of floorinsulation prep on a new project. #floorinsulation #floorprep #screedcontractor #readyforufh
Ready to go #screedpumps #screed #screeding #constructionuk #screedcontractor #cscscreeding #mortelmeisteruk
Cemfloor C30 at a commercial project #cemfloor #cementflowingscreed #screed
Ready for work
Heading out with another delivery to a CSC Screeding project. This truck helped us out no end through the period of material allocation. We were able to bulk stock material and self deliver, which helped us deliver projects for our clients with minimum disruption. #cscscreeding #logistics #screeddelivery #constructionuk #constructionmaterials
A visit to the Colville Road project this afternoon. We’re installing around 4,500m2 of Duremit 50 screed over various insulation and acoustic layers. Our Mörtel Meister screed pumps with hydraulic skip and remote control shovels are fully certified and will mix and pump around 580 tonnes of sand on this project. #screedcontractor #constructionuk #newhomes #screedingcambridge #mortelmeisteruk #screeding #screedpump #screedpumps
A visit to a fully completed housing development in Frating today. Not often we get to see the finished projects. A successful development of 67 new homes. #newhomes #constructionuk #screedcontractor
More new homes completed on this project in Cambridge, today. We’re installing the DPM, insulation and screed to ten new homes in this visit and another fifty to go. #constructionuk #screedingnewhomes #screedcontractor #screeding #screed #cscscreeding #builder
More new homes prepped and ready for the underfloor heating. We’ll be back later in the week to lay the screed. #floorinsulation #newhomes #constructionuk #screedcontractor #reputable
Screed going down at Scottsdale Fordham. This is another project nearing completion, just a few more new homes and a commercial space to go. #cscscreeding #reputable #constructionuk #newhomes #cambridge
The last few houses on this project in Oxford and we’re done. This truck is considered an essential tool for getting the job done. #cscscreeding #deliver #screedlogistics #constructionuk #reputable #screedcontractor #screeding #oxford #newhomes #reputation
Construction Accreditations
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.
