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Technical Detail of Liquid Flowing Screed
The following data, supplied by the screed manufacturers, is reproduced below for easy reference. We would suggest that you check these technical specifications have not been superceded since this page was published.
Please refer to the appropriate manufacturer’s Web site, see the links page, or by contacting them directly.

Lafarge Gyvlon Flowing Screed

Lafarge Gyvlon Description
GYVLON FLOWING SCREED is a blend of GYVLON BINDER and selected aggregates mixed with clean potable water to produce a flowing pumpable screed.

Lafarge Gyvlon Uses
GYVLON FLOWING SCREED is designed to provide a smooth level surface in both commercial and domestic buildings prior to the application of floor finishes and is particularly suitable to application as a floating screed and for use with underfloor heating systems.

Lafarge Gyvlon Key Features

Increased productivity - 2000m2/day can be easily achieved. (average 500-1000 m2/day).

Can be walked on in 24-48 hours.

Does not require curing.

Extremely low shrinkage - does not curl and minimises the risk of cracking.

Suitable for floating floor construction.

Avoids the need for reinforcement.

Ideal for use with underfloor heating systems enabling rapid commissioning of the underfloor heating in accordance with BS1264:2001-Part 4 clause 4.4.

Significantly reduced thickness when compared to traditional sand - cement screed.

Weight saving as a result of thinner section.

Large bay sizes of up to 30-40 linear meters depending on application.

Dries at a rate of 1mm per day up to a screed depth of 40mm however this can be affected by adverse site conditions.

Can be force dried as early as 7 days after application.

Easily achieves SR2 finish as described in BS8204.

Protein free - cannot harbour harmful bacteria.

Non combustible (tested to BS476 Part 4).
Minimal Thermal expansion (0.012mm/mK).
Excellent thermal conductivity (2.2W/mK).
Key Features
Lafarge Gyvlon Technical Data
Appearance/Colour: Off-white fluid mortar
Water demand: 13-15% b.w.
pH: >10
Wet Density: 2200kg/m3
Dry Density: 2000kg/m3
Composite Screed Properties (Typical)
Nominal 750kg/m3 Gyvlon Binder + Standard Sand to
clause 5.1 of EN196-1: 1994 and 13.5% water.
Flow: DIN 1060 Flow Ring 260mm
Setting Time: EN196-3:1994 Vicat
Initial Set > 300 Mins
Final Set < 660 Mins
Compressive Strength:
3 days > 15N/mm2
28 days > 30N/mm2
Flexural Strength:
3 days > 3 N/mm2
28 days > 8 N/mm2

Lafarge Gyvlon Minimum Application Thickness
Bonded: 25mm
In Contact with Substrate: 30mm
Unbonded: 30mm
Floating Commercial: 40mm
Floating Domestic: 35mm
Underfloor Heating: 30mm minimum cover to pipes

Lafarge Gyvlon Delivery
GYVLON FLOWING SCREED is supplied in bulk via a concrete plant in 5m3 mixer trucks.

Lafarge Gyvlon Health & Safety
Some of the components of this product may be hazardous during mixing and application. Please consult the relevant Health & Safety Data Sheets, available from Lafarge on request and provided with each delivery.

Maxit Alpha 751 Self-Levelling Pumped Screed

Maxit Alpha Pumped Screed Description
Alpha 751 is a pumpable, high-quality floor screeding material based on calcium
sulphate. It is supplied as a pre-blended dry powder and is designed for application
at thicknesses between 20 and 80 mm although it can be laid thicker where required*. The system has been used extensively across Europe and complies with CUR Recommendation 62, Levelling screeds with calcium sulphate as a binding agent in The Netherlands.

Maxit Alpha Pumped Screed Application
Alpha 751 is designed for use as a levelling screed in residential and commercial locations, public buildings, and other applications subject to similar loads. Alpha 751 may be applied as a levelling screed directly onto a load bearing floor, an unbonded screed on an intermediate layer, a floating floor, a leveling screed incorporating heating pipes and a levelling screed as a cavity floor. Alpha 751 should be covered with a floor covering such as tiles, linoleum, parquet, cork or carpet. If a cement based adhesive or smoothing compound is required the surface of the Alpha 751 screed must first be sealed using the appropriate maxit-UK sealer*.

Maxit Alpha Pumped Screed Substrate
Alpha 751 is designed for use as a bonded thick levelling screed on concrete. In addition, it can also be applied as a floating screed over thermal or acoustic insulation or as an unbonded screed on top of a plastic membrane.

Maxit Alpha Pumped Screed Finish
The high quality finish is suitable for final floor coverings with minimal preparation and
is compatible with most commonly used adhesives and soft floor finishes. Alpha 751 is
an underlayment and should not be painted or used as a finished surface.

Maxit Alpha Pumped Screed Technical Data for Alpha 751
Mortar (mixed)
Water requirement 14%M/m)
Slump (to be determined using the Hagerman cone) 220 – 260 mm
Density 2200kg/m3
Entrained air 2% (v/v)
Stability 0.5% (v/v)
Mortar (cured)
Mass per unit volume 2100kg/m3
Flexural strength >4N/mm2
Compressive strength after 1 day >12.5N/mm2
Compressive strength after 28 days >30N/mm2
Tensile strength >1.5N/mm2
Shrinkage <0.02%

Maxit Alpha Pumped Screed Substrates
• Concrete
• Stone or Ceramic
• Insulation
• Plastic membrane
• Underfloor heating

Maxit Alpha Pumped Screed Layer Thickness
Bonded 20 mm
Unbonded 30 mm
Floating 40 mm
Cure Times*
Foot traffic 16 hours
Up to 40 mm 1 cm/week
(Over 40 mm – consult maxit-UK technical department)

Maxit Alpha Pumped Screed Pot Life
Maximum 40 minutes depending upon ambient conditions

Maxit Alpha Pumped Screed Water Addition
3.5 litres/25 Kg (14%)

Maxit Alpha Pumped Screed Material Consumption
1 mm = 1.9 kg
20 mm = 38 kg
40 mm = 76 kg

Maxit Alpha Pumped Screed Packaging
• 25kg bags on plastic wrapped pallets
• Silo

Maxit Alpha Pumped Screed Storage

6 months under dry conditions

Maxit Alpha Pumped Screed Floor Primer
ABS MD16 Primer

Maxit Alpha Pumped Screed Installation
Light ventilation in the work area is necessary but windows and other openings must be closed sufficiently to avoid draughts during and after application to ensure curing of the screed does not occur too rapidly. The temperature of the substrate and environment should also be frost-free during this period. The relative humidity of the substrate and environment should not be allowed to fall below 50%.

Maxit Alpha Pumped Screed Preparation of the Substrate
If the Alpha screed is to be a fully bonded screed, the substrate should be free from any contamination, which may adversely affect adhesion. Any holes should be sealed in order to prevent leaks. The substrate should be laitence free, cleaned with a vacuum cleaner and damped with clean water.
If the substrate is very porous it may be primed using maxit ABS MD16 adhesive primer applied in accordance with the application instructions (see separate product information sheet). The primer should be applied using a soft broom and left to become touch dry (3-4 hours under good conditions or longer dependant upon conditions). Immediately after application, and whilst the primer is still fresh, it should be lightly brushed to ensure a complete uniform film has been applied.
The function of the primer is to improve adhesion, prevent air bubbles, reduce water extraction from the screed and bind any remaining dust particles. If Alpha 751 is to be applied on plastic sheeting or as a floating floor, a gap of minimum 8 mm gap should be formed around the perimeter (walls, columns, etc.).

Maxit Alpha Pumped Screed Priming
ABS MD16 Primer should be applied to the prepared surface using a soft brush or a primer pump, avoiding ponding, and allowed to become touch dry (3 - 4 hours under good conditions or overnight dependent upon conditions). After application and whilst the primer is still fresh, it should be lightly brushed to ensure a complete uniform film has been applied. The function of the primer is to improve adhesion to the sub-floor, to prevent air bubbles and to prevent de-watering of the floor compound before hardening. For more details see separate data sheet for ABS MD16.

Maxit Alpha Pumped Screed Mixing

Alpha 751 should be mixed with 3.5 litres of water per 25 kg, or 14% (m/m) of dry powder. Do not exceed the recommended quantities as too much water leads to a reduction in the overall strength of the cured material. Mixing time, if using a hand held drill and paddle, is 2 minutes. Do not mix more material than can be laid in 20 minutes. A suitable mixing pump system, approved by maxit Building Products Ltd, should be used for mechanical mixing. The most favorable temperature for mixed mortar is between 10oC and 20oC.

Maxit Alpha Pumped Screed Raw materials
Binding agents
Calcium sulphate; Alpha-hemihydrate
Sand as per NEN 5905 and NBN B11-001, maximum grain size approx 4mm
A combination of additives, which promote the liquidity, stability and adhesive strength.

Typical Installation of Liquid Floor Screed

1. Vinyl Coverings
2. Alpha 751
3. Underfloor heating
4. Thermal/Acoustic Insulation

5. Concrete Substrate

Typical floor structure with underfloor heating

Tarmac Truflow Flowing Screed
Truflow Self Levelling Screed

Tarmac Truflow Self Levelling Screed is a calcium sulfate based pumpable self - smoothing floor screed for use in floor Ievelling applications. The product is factory produced under quality controlled conditions and conforms to the requirements of BS EN 13813. The product is delivered to site by truck mixer ready for immediate use and can be pump applied to create a
smooth and level surface for the application of floor coverings, tiles and other floor finishes.

Tarmac Truflow Self Levelling Screed is highly versatile and can be applied as a bonded screed, unbonded screed or as a floating screed over thermal or sound insulation. It is also ideal for use in conjunction with most underfloor heating systems. It is suitable for use in most commercial and domestic buildings in both new build and refurbishment applications and can be readily applied over installed electrical and other services.

Truflow Self Levelling Screed - Advantages
• Delivered factory-produced and ready for immediate application
• Allows a rapid rate of application of up to 2000 m2 per day
• Laid only by Tarmac approved Contractors
• Normally accessible to foot traffic within 24 hours
• Self-compacting without segregation

• Permits the designer to use lower minimum thicknesses compared to traditional cement sand screed systems

• Minimal need for joints
• Soundness category A according to BS 8204: Part 1 (annexe E) (BRE Screed Test)
• Class SR2 surface regularity (² 5 mm in 2 m length)
• Protein free, will not harbour bacteria

Fresh wet density
Compacted, set and air dried density
Flexural strength class
Flow properties1
Drying shrinkage
Open to foot traffic2
Setting time2
Fire rating3

2100 - 2200 kg/m3
2000 - 2100 kg/m3
F4 - F6
Typically 220 mm
Typically ² 0.02%
24 hours
4 - 6 hours
Class A1 non combustible

Table 1 : Typical physical properties
(1) Determined according to B5 8204: Part 7 annex A flow ring test
(2) At 20°C and 65% relative humidity
(3) Classification A1 without testing to BS EN 13501-1-(Commission Directive 96/603/EC)

Truflow Self Levelling Screed - Performance Characteristics
Speed Of Application: This product permits rapid application rates to be achieved and its easy handling and pumping characteristics allow up to 2000 m2 of screed to be laid per day.

Truflow Self Levelling Screed - Coverage Per m3
Approximated coverage per m3
Depth Of Screed / Coverage (m2)
30 mm / 33.3
40 mm / 25.0
50 mm / 20.0
60 mm / 16.7

Truflow Self Levelling Screed - Surface Regularity
A surface regularity of class SR2 BS 8204; Part 7: 2003 can be readily achieved with this product. That is the departure from the underside of a 2 m straightedge resting in contact with the floor is < 5 mm.

Truflow Self Levelling Screed - Category Of Use
The soundness categories of floors described in BS 8204: Part 1 for bonded and unbonded screeds are summarised below:

Areas expected to take heavy foot traffic and/or heavy trolleys and/or
where later disruption would be unacceptable.

Areas expected to take heavy foot traffic and/or medium weight trolleys.

Other areas expected to take foot traffic and lightweight trolleys.

Hospital operating theatres; X-ray rooms; Rooms where radioactive

Material is handled.

Public areas; Corridors; Main lift and lobby areas; Canteens and restaurants; Public rooms in residential hospital accommodation; Classrooms; Hospital wards and offices.

Light office use; Consulting rooms;

Domestic housing.

BS 8204: Part 7 states that soundness may be assessed using the BRE screed test as described in BS 8204: Part 1 (annex E) which measures the in situ crushing resistance of the floor. Tarmac Truflow Self Levelling Screed achieves a value of < 2 mm by this test and therefore meets the requirements of the most stringent category i.e. Category A applications.

Minimum Thickness for Truflow Pumped Screed
Minimum Thickness (mm) / Floor Type
Bonded / 25
Unbonded / 30
Floating / 40
Over conduits and heating pipes / 25
For all floor types abrupt changes in screed thickness should always be avoided as these may lead to the formation of cracks.

Minimum Thickness for Truflow Pumped Screed over Insulation
Levelling Screed Construction Area of Use Minimum Thickness at any point

Bonded screed Domestic and commercial 25 mm

Unbonded screed Domestic and commercial 30 mm

Floating screed Commercial 40 mm

Domestic only 35 mm

NOTE: Any deviations in the levels and surface regularity of the base slab should be taken into consideration when determining the thickness of the pumpable self-smoothing screed to be laid, so as to ensure the minimum/maximum thickness can be achieved.
The maximum compressibility of the insulation must be 5 mm.

General Information for Truflow Pumped Screed
Site preparation and application of Tarmac Truflow Self Levelling Screed may only be carried out by Contractors who have successfully completed Tarmac’s training programme. A current list of licensed contractors can be obtained from your nearest Sales Office.
The product has not been designed to be used as a wearing surface and is not suitable for use in external or permanently wet areas. The product should therefore not be applied to areas subject to prolonged wetting unless the screed is completely sealed with an impervious barrier.

Health & Safety for Truflow Pumped Screed
Wear suitable protective clothing and eye protection. Where skin contact occurs, either directly or through saturated clothing wash immediately with soap and water. For eye contact, immediately wash out eye thoroughly with clean water. If swallowed wash out mouth and drink plenty of water and seek medical attention. For further information refer to Tarmac Safety Data Sheet.

General Site Preparation for Truflow Liquid Screed
The building should be weather tight before the screed is applied. Where appropriate, for example in ground floor applications, a damp proof membrane should be placed below the screed base. The floor area must be swept or vacuum cleaned and free from any projections. For all applications a foam border strip must be fixed all around the perimeter of the area to be screeded. The border must also be fixed around any upstands. If adjoining areas through doorways or other openings are not being screeded at the same time, a border strip should be fitted and supported across these openings. In general the border strip should be at least 5 mm thick. For under floor heating applications a 10 mm thick border strip should be used. Any structural joints must be extended through the screed. The product flows rapidly around pipes and conduits providing maximum contact without air pockets. The cover over conduits and heating pipes must be at least 25 mm. For areas of sufficient size to require two or more truck mixer deliveries, care should be taken to fully mix all deliveries at their interface.

Preparation of Unbonded Floors
Application Over Thermal or Sound Insulation
Tarmac Truflow Self Levelling Screed can be laid over thermal or sound insulation without the need for reinforcement. The lower thickness of screed required compared to traditional cement: sand screed provides important weight and floor to ceiling height benefits. The thermal or sound insulation sheets should be butted tightly against each other and fitted right up to the perimeter of the floor. Overlapped and taped polythene sheets of 150 micron minimum thickness (500 gauge) should be laid on top of the insulation. The polythene sheeting is intended as a debonding membrane and not a damp proof membrane. The polythene sheeting should be fixed carefully to the perimeter of the floor and all upstands. Great care must be taken to avoid dirt or debris from contaminating the polythene sheeting after fitting.

Application With Under Floor Heating Systems
Expert advice should be sought regarding the installation of the under floor heating system. The excellent flow characteristics of Tarmac Truflow Self Levelling Screed make it ideal for use with such heating systems since it flows readily around pipe work allowing maximum contact with the pipe work and is self compacting. It is suitable for use with most electrical and water pipe under floor heating systems. Border strips minimum 10 mm thickness must be fixed around the perimeter and all upstands. The heating system should not be turned on for at least seven days after application of the screed.

Preparation Of Bonded Floors
Tarmac Truflow Self Levelling Screed can be used in all bonded systems but it is usually preferable to apply the product as an un-bonded or floating floor system. Prior to application of a bonded floor, the surface must be shot blasted or scabbled. Careful attention must be paid to ensuring that the surface is free from dust, vacuum cleaning usually being essential. Great care must be taken not to reintroduce dirt or dust onto the floor after cleaning. The floor must be sealed with a suitable bonding agent prior to application of the screed. Contact your local Tarmac Area Office for further advice.

Truflow Liquid Screed Preparation and Placing
Tarmac Truflow Self Levelling Screed is a factory produced product that is manufactured under strict quality control conditions. All materials are factory produced and then delivered to site by truck mixer ready for immediate use. Further quality control testing is carried out on arrival at site Tarmac Truflow Self Levelling Screed is then applied to the floor by Tarmac approved contractors using conventional pump equipment.

Post Application of Truflow Liquid Screed
There are no specific curing requirements. However, protection from severe drafts and strong sunlight is necessary although some air movement through the building may be beneficial. The floor should not be covered by polythene sheeting and should not be subject to heating for the first seven days after application of the Tarmac Truflow Self Levelling Screed

Surface Finishing
The dried screed is suitable to take all types of final floor finishes, but is not itself designed as a wearing surface. Where required the surface should be lightly sanded after 3-4 days to remove any fine laitance before bonded final finishes are applied. The achieved flatness and surface texture may not be adequate for some thin floor coverings and coatings, therefore provision should be made to finish the screed by applying a smoothing compound to the hardened screed as part of the floor covering system just prior to laying the final floor covering. A calcium sulfate screed will almost certainly require a suitable primer before application of a smoothing compound.

Drying Time for Truflow Liquid Screed
Normal Drying
The drying time determined according to the requirements of B5 8203 code of practice for installation of resilient floor coverings and BS 5325 code of practice for installation of textile floor coverings. BS 8204: Part 7 indicates that 1 days drying should be allowed for each mm of thickness for the first 40 mm, followed by an increasing time for each mm above this thickness.
Exact drying times are dependent on temperature, humidity and air movement through the building. Any moisture in the floor below the screed will impair the drying rate of the screed unless a damp proof membrane has been installed between the two. The level of moisture in the screed should always be checked in accordance with BS 8203 or BS 5325 prior to application of the final floor covering.

Forced Drying
Forced drying should not be applied to the final screed within seven days of application. Further advice can be provided upon request from your nearest Tarmac Sales Office.

British Standards Institution
BS 5203: 2001 Code of practice for installation of sheet and tile flooring
BS 8204 Screeds, bases and in-situ floorings
Part 1: 2003 Concrete bases and screeds to receive in-situ floorings - Code of practice
Part 7: 2003 Pumpable self-smoothing screed - Code of practice
BS 5325: 2001 Code of practice for the installation of textile floor coverings
BS EN 13813: 2002 Screed material and floor screeds- Screed material-Properties and requirements.
BS EN 13892 Methods of test for screed materials (A multipart standard)
Part 2:2002 Determination of flexural and compressive strength.

British Cement Association
Publication 48.046 Construction Guide: Laying floor screed.
Tarmac General Mortar and Mix Design Manual

Cemex Supalo Flowing Screed

CEMEX Supaflo® is a flowing screed flooring solution based on a calcium sulfate binder.
Supaflo® has been developed over many years and is at the forefront of screed technology.
It provides significant benefits over traditional screed to the extent that in some European countries over 50% of all screeds used are of this type.
Supaflo® is only supplied to trained contractors.
The advantages over traditional floor screed include speed of application, excellence of surface finish, attainable accuracy of placement and finishing, reduction in thickness and elimination or substantial reduction of movement joints.

Cemex Supalo Flowing Screed Productivity
The table below compares typical daily productivities of Supaflo® and conventional screeds. Using a flowing screed like Supaflo®, installation thicknesses can be reduced, the area installed in a day can be increased 5 to 10 times, a surface regularity of SR2 or better can be achieved and the possibility of curling eliminated due to minimal differential shrinkage.

Traditional site mixed
cement: sand screed

Factory produced semi
dry cement sand screed


Cemex Supalo Flowing Screed Composition
Supaflo® is composed of precisely weigh batched calcium sulfate binder and selected aggregates.
The formulation includes sophisticated admixtures, which enhance the plastic properties to aid ease of placing and surface finishing, as well as contributing to improved final hardened properties.

Cemex Supalo Flowing Screed Manufacture
In the UK there is a network of over 40 specialist production units, which cover the vast majority of the country (please check local availability). The addition and mixing of all constituent materials is carried out under precisely controlled conditions to ensure complete dispersion of the mix components.

Cemex Supalo Flowing Screed Compliance & Testing
Supaflo® has been designed to comply with the requirements of:-
• European standard BS EN 13813:2002, Screed material and floor screeds, Screed Material – Properties and Requirements.
• Supaflo® is used to comply with the requirements of the Code of Practice for Floor Screeds, BS 8204: Part 7.
• All constituent materials comply with the relevant British and/or European Standards.
• The Calcium Sulfate used in Supaflo® binders is produced under the stringently controlled conditions of ISO 9001.
• Every load of Supaflo® is tested prior to delivery by CEMEX quality control technicians. An acceptance test is also carried out by the approved contractor before it is pumped. Specially produced flow table equipment is provided for this purpose to each manufacturing unit and to all approved contractors.

Cemex Supalo Flowing Screed Characteristics
• Compaction – The flow characteristics of Supaflo® mean that voids and poor compaction are virtually eliminated. The material self compacts as it flows in to position, giving good resistance to abrasion and impact when compared with conventional screeds. Supaflo®, also complies with the Building Research Establishment Screed Test and indentation requirements of BS 8204.
• Shrinkage – Supaflo® has virtually no drying shrinkage. Movement joints are rarely necessary, however large the floor, as long as the aspect ratio does not exceed approximately 1 to 6 or the total area, about 2000m3. This lack of shrinkage means that differential shrinkage leading to lifting and curling will not occur.
• Fire protection – Supaflo® is non-combustible as defined by BS EN 13501-1.
• Acoustic performance – Supaflo® is far superior to that of conventional screeds. (part E regulations).
• Effect of frost – It is recommended that suitable precautions be taken against frost during cold weather conditions before final strength is achieved.
• Durability – Supaflo® as with virtually all screeds, is not a wearing surface, and requires covering with a suitable surface finish.
• Wet areas – Supaflo® should not be used in areas where it will be continuously wet, or in regular contact with water. It is not recommended for use in communal baths or showers, changing/ washing areas of sports centres, abattoirs, external yards or similar.

Cemex Supalo Flowing Screed Technical Properties
Flow (DIN 1060 test) 240 - 260mm
Plastic density 2060 - 2130kg/m3
BRE impact test less than 2mm
Flexural strength 4 - 6N/mm2
Drying shrinkage less than 0.02%
Time to light foot traffic 1 to 2 days
Drying time at 20ºC and 65% RH 1 day/mm up to 40mm then 2 days/mm
Dry density 1950 - 2050 kg/m3
Fire rating Non combustible
Thermal expansion coefficient mm/mK 0.01 mm/mK
pH 11 - 12
Setting time not less than 3 hours

Cemex Supalo Flowing Screed Thickness and Area
• The high flexural strength of Supaflo® and the lack of voids, means in general it may be laid substantially thinner than conventional materials.
• For instance, in most cases 35mm of Supaflo® will replace 75mm of conventional screed.
• In many cases conventional material will have been specified originally on the basis of a 75mm thickness of conventional cement sand screed.
• If it is replaced by Supaflo® the screed thickness may be reduced and the overall thickness of 75mm made up with appropriate floor grade insulation material. This will provide economies in the usage of screed and will enhance the acoustic and thermal properties. Drying time will also
be significantly reduced allowing the wearing surface to be laid sooner.
• The minimum thickness of application should be as shown in the table below.

Type of construction Minimum application
Thickness (mm)

Unbonded 30
Floating 35

• It is recommended that Supaflo® is laid on a minimum 500-gauge polyethylene de-bonding membrane.
• Supaflo® may be laid in larger bays than traditional floor screeds. Where the approximate shape of the bay is square up to 2000m2 can be achieved. Where the area becomes elongated and approaches an aspect ratio of 1:6 a movement joint should be considered.

Cemex Supalo Flowing Screed Site Work
• Supaflo® is delivered to site ready to use and pumped directly to the point of use; this means that there is no site mixing, only placing.
• A typical pump output can cope with 150m horizontal distances and 60m vertically.
• In practice it takes about 25 ± 5 minutes to pump 5m3 of Supaflo®.
• It is preferable during construction to ensure a steady supply throughout the placement, with no break in continuity that exceeds about one hour.
• Temporary stop ends should be formed where there is a break in supply greater than 1 hour.
• Stop ends can be constructed using timber, scaffold battens, dense concrete blocks or other convenient temporary barriers. They should form a vertical barrier, which can be removed when the next section is placed.
• They should either form a separate but continuous run, without mixing the two areas, or if appropriate use very firm and thorough mixing of the two, to achieve homogeneity.
• It is recommended that the Supaflo® system be treated as debonded and ducts, services and similar are sealed against fluid loss in the flowing system.
• The material should be pump placed onto a prepared membrane, with minimum 5mm compressible plastic strips on all perimeter edges. The membrane may be plastic with taped joints or paper, either heat sealed or taped.
• Underfloor heating may be used 5 days after placing the screed, however the temperature should be increased from ambient by no more than 5ºC a day until full operating temperature is reached.
• Only contractors who are fully trained in its application should lay Supaflo®.

Cemex Supalo Flowing Screed Curing
• Care should be taken to avoid excessive water loss in the first 24 hours.
• Any unglazed or missing windows or doors should be temporarily blocked using plastic sheeting or similar to avoid excessive drying for the first 24 hours.
• After 48 hours, all windows and doors should be opened to allow circulation or de-humidifiers may be used to force dry the material.
• Direct sun must also be avoided during early life.
• Supaflo® may be lightly trafficked after 1 to 2 days, depending on drying conditions.

Cemex Supalo Flowing Screed Hardening and Drying
• The most important consideration when covering Supaflo® is that the material is sufficiently dry for end application.
• For permeable coverings such as carpet a moisture content of less than 1% is required.
• For moisture sensitive coverings such as vinyl, a moisture content of less than 0.5% is required.
• Significant reductions in screed thickness can be achieved by using Supaflo® over conventional screeds in many construction applications, and this in turn will reduce overall drying times.
• Typically, 2 days after installation the screeded rooms must be well ventilated during the day, with doors and windows kept open this will ensure quick drying and rapid strength development.
• Optimum drying time can only take place when warm, moist air is exchanged with cold, dry air, which can absorb moisture again with a rise in temperature.
• Forced air movement using fans can aid the drying process.
• At night when temperatures drop, all doors and windows must be shut to prevent condensation.
• This procedure must be carried out until the screed has dried completely.

Cemex Supalo Flowing Screed Application of Floor Covering
• If the floor covering is to be applied directly to the screed or if the vinyl is thin then the surface of the screed may need sanding or grinding.
• This is usually carried out when the screed is between 3-10 days using a mechanical surface grinder.
• The surface must be free from the ground material before applying the floor finish.
• When bonded floor coverings are applied directly onto Supaflo® it is necessary to prime the screed to regulate suction over the entire area.
• The type of primer used will depend on the chemical make up of the adhesive. In the situations where calcium sulfate based adhesives are used an acrylic, epoxy or similar primer should be applied between the two materials.
• Cementitious adhesives will require the two materials to be separated by an impermeable layer, which would be a polymeric sealer.