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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.
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THE SCREEDER’S JOURNAL
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One of the CSC Screeding teams at the Portsmouth University, Sports Building project. We’re installing Isocrete Heavy Duty K Screed to circa 5,000m2 over thermal insulation for Wates Construction Ltd. We are pan floating the screed with one of our Mörtel Meister Super Trowels which leaves an awesome finish. Just ask our clients what they think? #cscscreeding #panfloatfinish #mortelmeisteruk #supertrowel #qualityandvalue #constructionuk #screeding #isocretekscreed
One of our Mörtel Meister Screed Pumps with hydraulic skip and remote control shovel at work on another large construction project. These Screeding pumps tick all our boxes by reducing manual handling, easy to operate, fuel efficient, quiet, capable of pumping large volumes of material and very reliable. Just what a screed pump operator or contractor wants. We’re also very proud of our corporate blue brand colour and infamous swoosh logo. Look out for the CSC Blue Official. #cscscreeding #cscblueofficial #cscblue #cscblueonaprojectnearyou #mortelmeisteruk #constructionuk #constructionplant #constructionlife
Busy on the Xtratherm insulation today. 120mm PIR insulation and 500g polythene separating layer, all ready for Isocrete Heavy Duty K Screed. #cscscreeding #constructionuk #xtratherm #tekfloor #isocretekscreed #screedingportsmouth #floorinsulation
Steel angles measured and cut off site, ready for installation tomorrow. We’ve had a busy couple of days at the Portsmouth University Sports Project. #constructionuk #steelangles #screedcontractor #building
Screeding underway at the University of Portsmouth, Sports Building. We’re installing Isocrete Heavy Duty K Screed over thermal insulation and various thicknesses of void former., steel angles, temporary timber shuttering and more. #constructionuk #wates #screedingleisurecentres #screeding #isocretekscreed #mortelmeisteruk
Ready for a busy few days on this one. Sand on site ✅ Cement on site ✅ Water facility ✅ Datum level in place ✅ The CSC screed pump and PP Fibres will arrive on site with one of the CSC mobile Screed Team’s. #cscscreeding #constructionuk #screeding
Nice to see the CSC Screeding reusable pallet covers out on site and protecting our cement from the elements. #constructionuk #constructionmaterials #cement
One of the CSC Screeding Teams at Wembley Point! We’re installing Ardex A29 fast drying screed on a prepared concrete base and bonded with Ardex A18 grout. #cscscreeding #constructionuk #ardexuk #wembley #screeding
The CSC Screeding Team are installing Ardex A18 bonding grout and Ardex A29 fast drying screed at the Wembley Point refurbishment project. #constructionuk #cscscreeding #ardexuk #screedingwembley
Another five apartments and corridor prepared today and ready for underfloor heating. We’ll be back to start installing the high quality screed, very soon. #constructionuk #floorinsulation #newhomes
Our MD completed the CITB COVID-19 course today and next week, we’ll be rolling this out to our managers and supervisors. #constructionuk #covid_19 #staysafe
Work has commenced at the University of Portsmouth, Sports Building. We’re installing temporary timber shuttering, thermal and void former insulation with a polythene separating membrane and heavy duty Isocrete K Screed. A challenging first day, where just about every obstacle seems to have been put in our way but looks like we’ve come out the other side and good to go. Now we can focus on what we’re really good at, high quality Screeding to meet even the most stringent of quality control. Well done team! #constructionuk #screedingleisurecentres #reputablescreedcontractor #bs8204 #cscscreeding #cscblue #cscscreedteam #cscprepteam
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.
