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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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Our Recent
SCREEDING WORK
- 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.
Live News
THE SCREEDER’S JOURNAL
@CSCScreeding
Well that’s the prep done and ready for the UFH company. We’ll be back on Wednesday to install the Isocrete K Screed. We have installed circa 8,000m2
of Isocrete K Screed and various insulation and resilient layers on this project. #cscscreeding #isocretekscreed #cpguk #constructionuk #happycustomer
One of our Mörtel Meister Screeds pumps on a large residential project in Cambridge. The skip and scraper model makes for efficient loading. #cscscreeding #screedcontractor #screedpumps #mortelmeisteruk #cscblue
Back to the Century House project in Horsham today. Cemex Supaflo to the fourth floor, leaving just one more visit and we’re done. Well done team! #cscscreeding #cscscreedteam #cemex #flowingscreed #constructionuk #newhomes
Mapei Topcem Screed on Kingspan Greenguard 300 insulation for the Lord Wandsworth College project. Our Mörtel Meister Screed Pump with hydraulic skip and remote control shovel will mix and pump the screed in super quick time. #cscscreeding #screeding #constructionuk #mortelmeisteruk #screedpumps #cscblue
Large format steel angles for the Pollys Field Care Home project in Braintree. Well done to the CSC prep team for getting this completed today. #cscprepteam #screedangles #screeding #movementjoints #constructionuk
A visit to the Wing project today. We’re so proud to be working on such a landmark project with @hillgroupuk. #constructionuk #newhomes
One of the CSC Screeding Teams on a project in Cambridge. We’re working on the S1 apartment buildings and delivering the insulation, acoustic layers and high quality screed. Our extremely reliable Mörtel Meister Screed Pump with hydraulic skip and remote control shovel, will make light work of this load of sand. We thank our team for delivering great workmanship and our client for trusting CSC to deliver. #cscscreeding #constructionuk #screedpumps #screeding #cambridge #screedcontractor #mortelmeisteruk
Another five new homes nearly ready for screed. Today we installed the DPM, 150mm PIR insulation with 25mm perimeter strip to the external walls and a 500g polythene separating layer. The 8mm PE foam perimeter and high quality screed will be installed very soon. #newhomes #floorprep #cscprepteam #floorinsulation #cscscreeding #pir
Nico is very proud to keep our Mörtel Meister Screeding Pumps looking good.
Hard to believe this one is two and a half years old! We believe in the age old saying ‘look after your tools and your tools will look after you’.
Just how we like it
Thanks Nico
#cscscreeding #screedpumps #lookafteryourtoolsandyourtoolswilllookafteryou #theperfectstarttoaperfectfinish #cscblue #mortelmeisteruk
Happy to receive our approved Isocrete contractor licence. Looking forward to delivering a number of exciting projects throughout 2021. #isocrete #cpguk #cscscreeding #constructionuk #screedcontractor
On site in Oxford this morning. Completing communal areas to Block A and allowing site traffic to resume on Monday morning. The sun is shining, have a good weekend, all #cscscreedng #teamwork #screeding #screedcontractor #cscblue
More prep can only mean one thing in our world! More SCREED. These are new apartments in the Cambridge region for a well respected 5 star house builder. #floorinsulation #constructionuk #newhomes #cambridge #cscscreeding
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.
