With several products available in the market that promise to deliver the perfect foundation for any build, “traditional screed” is now falling into obscurity. There is a new material making the rounds.
Introducing Cemfloor Liquid Screed; this type of screed promises improved strength to the base of your structure. Complying with EN13813 regulations, Cemfloor offers far more resilient and professional flooring finishes
Here at Liquid Screed, we see Cemfloor as a self-levelling, flowing screed flooring system, which comprises a cement binder, proprietary additives, fine aggregates, water and high range water reducer.
Like most liquid screed, Cemfloor is prepared in factories and delivered to sites in a ready to use state through mixer trucks.
We suggest that Cemfloor Liquid Screed should be installed by qualified contractors, such as those at Liquid Screed who specialise in cement based flowing screed.
We offer 3 products in the Cemfloor range, which are:
- C16/F3: generally used for domestic non-underfloor heating
- C20/F4: utilised for domestic as well as underfloor heating
- C25/F5: used only for commercial purposes
Cemfloor screed is incredibly receptive to underfloor heating; as it can be applied in very thin sections and has a high thermal conductivity of around 2.9w/mk.
Since it is a cement based screed, various floor coverings can be laid more rapidly in comparison to calcium sulphate screeds that need a concluding moisture content of up to 0.5%, which could hold-up floor finishing for months.
On the other hand, Cemfloor Liquid Screed could be covered at a concluding moisture content of up to 5% and timber floors could be laid at the final moisture content of 2.8%; thereby speeding up build process.
When compared to other types of liquid screed that normally require force drying with underfloor heating; Cemfloor screeds can be utilised in non-heated floors as well, since they don’t need any force drying in order to get rid of moisture.
Due to its excellent thermal conductivity, effectiveness and cost-efficiency, Cemfloor is slowly becoming the trend option for underfloor heating for both commercial and residential projects.
Key Benefits of Cemfloor Liquid Screed
We’ve taken the liberty to compile a list of various benefits of using Cemfloor liquid screed over other types of screed:
- Thinner sections in comparison to traditional screed and has 25mm above underfloor heating pipes.
- Excellent thermal conductivity up to 2.9w/mk.
- Larger floor area without any joints around 150m2.
- Decreased drying time-that is approximately 10 days for tiling and 28 days for wooden floors with non-heated floors; whereas for heated floors the drying time is 14 days for tiling and 21 days for wooden floors.
- Reliant on drying circumstances or an after appropriate moisture test.
- Any type of floor covering can be laid without the need for surface sanding.
- Self-compacting-that is it requires no voids surrounding the underfloor heating pipes.
- Minimal Drying Shrinkage, which is <0.05%.
- Thermal insulation can be utilized in floors in comparison to traditional sand-cement screed, leading to a better “u value” for the premise.
- Can be laid in wet areas.
- Can be polished for final floor finish.
- Foot traffic allowed after 24 hours of installation.
- Well-suited with every type of cement based tile adhesive.
- No priming is required.
- Can be force-dried after 7 days of application.
- Easy to install; up to 1000m2 a day.
- No surface laitance required after curing.
- Lower running expenses for underfloor heating systems, due to its thermal conductivity.
Liquid Screed boasts a highly skilled and experienced floor screeding contractor with excellent track record. Liquid Screed will be at your disposal and you can completely rely on us to get your projects delivered on time.
Cemfloor Liquid Screed: Pre-installation Guideline & Preparation of Substrate
Cemfloor screed must be applied only in a completely weather tight environment, which means that the premise should be constructed and all the doors and windows must be in place.
If doors or windows aren’t in place, then all the openings should be covered with polythene in order to create the much needed weather tightness. Cemfloor Liquid Screed can be installed as both bonded and unbonded system.
Nevertheless, for both systems the substrate must be sound enough with the surface being swept prior to the installation process begins. It has to be made sure that contaminants, such as organic matter, dirt, water, mud and construction debris are removed.
A minimum of 5mm thickness compressible border strip must be installed around the walls and up-stands, piers, pipes and columns. Also, a maximum bay size of 150m2 could be placed without having the need for construction joints, and the joints must be placed at every doorway.
So as to attain a perfect screed, it is imperative to craft a proper, smooth base. There are certain floorings that require to be grouted before the screed is applied, which is why it’s necessary to follow the right process. At times, extra units might be required to be placed so as to avoid any kind of damage.
Liquid Screed will take up the efforts of preparing the perfect combination of base so as to acquire quality end results. We also make sure that all dirt and debris is cleared by using vacuum equipment to ensure that area is crystal clear.
It is imperative to ensure that subfloor is laid even and at the correct level so as to accommodate insulation, Cemfloor Liquid Screed and floor coverings. In order to prevent leakage when the screed is being poured, all gaps and holes have to be entirely sealed. Also, the debris must be removed from the subfloor, because only then insulation sheets can be laid flat.
Whilst the insulation is being installed, its first layer around the service pipe must be cut and the gap between those pipes and insulation has to be filled with low strength sand and cement mortar. The next step is to place the second layer of insulation perpendicular to the first one, so that when walking on the second layer there shouldn’t be any movement in the layers and the surface should remain even.
The edge strips must be as suggested by the premise control. The edging strip has to be installed to the perimeter of every wall, columns and abutments, making sure that it’s firmly secured. Special attention must be paid to the corners of the wall.
Plastic Tanking Sheet
Before Cemfloor is poured a waterproof tank has to be crafted on top of the insulation sheet. On top of the insulation 500 gauge polythene must be laid, without any creases, along with polythene sheet joints partly covered by at least 100mm and secured with suitable tapes. The polythene sheet should be taped to the edging strip as well. It’s important to check whether all the joints are watertight and the protruding pipe is firmly sealed to the sheet.
Underfloor Heating Pipes
Only when the tanking sheet is firmly placed, underfloor heating pipes should be installed, clipped down every 300mm on straights and 200mm on bends. When the pipes are properly installed, they should be filled with water.
Expansion Strips and Reinforcing
Every joint must reflect structural joints in the substrate, which is why it’s imperative to take into account all the joint requirements in the final finished floor covering. Expansion joints should be laid across doorways, between heated and unheated areas, between independently controlled heating circuits and in areas of high thermal gain. The expansion strips must be kept 5mm below the intended level of final finished screed. Also, secured reinforcement fabric must be placed at external corners.
Hot Weather Protection
If the installation is being carried out during hot weather, then it’s of utmost importance to ensure that windows are blanked out in order to prevent excessive heat building up in the premise prior to, during and after Cemfloor Liquid Screed installation.
Pressure test must be conducted with the underfloor heating system and water leaks should be checked. It is necessary to examine the polythene for any tears along with checking whether the joints are properly taped. Confirming whether every area prepared for Cemfloor screed is in fit condition, without any leakages is equally significant. If there are any loose materials, which could perhaps float to the surface of the screed and spoil the entire floor finish, then it has to be removed immediately.
Cemfloor Liquid Screed: Installation Process
We believe that the process involved in the installation of Cemfloor screed is crucial and intricate, and it has to be conducted in an organised manner so as to attain the best results.
Before the process begins every load of Cemfloor must be tested for its workability and if required, it must be adjusted accordingly. The target flow for this type of screed has to around 230mm to 260mm.
In order to increase the flow of Cemfloor Liquid Screed by 10mm, at least 5 litres of water per meter of screed could be added- that is so as to increase the flow of a 5m3 load of Cemfloor screed by 10mm; 25 litres of water has to be added.
Proper care must be taken in order to prevent the leading edges from being left open for any period of time. If Cemfloor screed is being freshly delivered to the site, then it has to be blended really well with the help of a dappling brush or bar.
Once the liquid screed is blended, it is then applied to the desired level, by referring to the pre-set level indicators.
When the Cemfloor screed is laid on the surface, it must be levelled in one pass with the help of a dapple brush/bar. The entire levelling process must be completed by passing the screed in the opposite direction to the first pass. This can be achieved with the help of a dapple brush, which ensures that the full depth of the bar is being pushed into the screed.
Once the Cemfloor Liquid Screed is passed and levelled, an appropriate curing agent has to be applied on it. Typically, a knack sack spray is suggested; because the curing agent could then be used again during the second pass using a dapple bar.
We at Liquid Screed, ensure that the screed is laid optimally so as to increase the lifespan of the flooring, which would ultimately add up to the overall superiority of the final floor finish. This can go a long way in making sure that there is a flat and levelled exterior shielding the subfloor from being subjected to any kind of premature erosion.
However, if the Cemfloor screed isn’t applied appropriately it can decrease the overall quality of your floor; resulting into damaged floor covering. This can in turn prove to be a costly affair if you were to bear the expenses of refurbishing the very core of the floor.
When the screed is properly placed and finished, the area has to be sealed for at least 24 hours-during summers- and for 48 hours-during winters-until the first set has been finished.
After 24 to 48 hours, the slab will be all set for foot traffic. Also, windows and doors must be opened for proper ventilation, as it plays the role of providing a helping hand in the drying process. The area should be kept closed overnight and re-opened the next day.
Drying and Final Floor Preparation
Cemfloor Liquid Screed has to be sufficiently dried to the required relative humidity, which entirely depends on the floor covering being used. An appropriate test method has to be conducted to make sure that the slab has sufficiently dried.
The drying time of screed may vary depending on the drying conditions, the depth of slab and the last relative humidity content needed. After a span of 7 days, Cemfloor screed can be forced dried by using dehumidifiers and underfloor heating system.
The underfloor heating has to be custom-made in accordance to the manufacturers’ guidelines. Likewise, before the flooring is being applied, debris should be cleaned from the subfloor, which has to be lightly scraped with appropriate sand paper-if required, swept and vacuumed.
Liquid Screed: Why Choose Us?
Liquid Screed Ltd now offers a brand new screed- that is Cemfloor Liquid Screed to the UK wide developers. Liquid screed is the most economical and compatible choice for underfloor heating systems because of its incredibly conductive properties.
We at Liquid Screed, guarantee dedicated screed floor service suitable for both commercial and residential sectors. Liquid Screed offers quality oriented service to clients so as to make sure that the final result surpasses your expectations.
Alongside supplying Cemfloor Liquid Screed, as certified experts, we offer detailed guidance to our clients on preparations to the floor and an aftercare guide as well. Working with us you can make sure that your project is conducted as efficiently as possible and completed in a timely manner.
When it comes to Cemfloor screed, Liquid Screed is your one stop shop! Get in touch with us today, for a FREE no obligation quote. Call us on 0800 888 6663 or simply drop an email at email@example.com.