Application of abe.®screed SLC P cementitious self-levelling floor screed

Do not allow the primer to pond and ensure that it is completely dry before the application of the screed. The drying time is approximately 3 hours at 20 ºC depending on absorbency, temperature and humidity, otherwise overnight. (Refer to the table below for dilution and approximate undiluted coverage rates of abe.^®screed SLC acrylic primer).

The recommended substrate temperature is between 10 °C and 25 °C, but no less than 5 °C. The temperature of the substrate should exceed the “dew point” by 3 °C during application and hardening.
Temperatures should not fall below 5 °C in the 24 hours after application.

For the best results apply the first coat late afternoon while the substrate is cooling then follow with the second coat early the next morning.

Example: Assume 1 000 m² porous concrete i.e. two coats diluted.
First coat: 1 part neat product (requirement 60 L undiluted product) added to 300 L water – application late afternoon and use full 360 L diluted product.
Second coat: 1 part neat product (requirement 50 L undiluted product) added to 150 L water – use full 200 L diluted product.
For example 110 L undiluted product for 2 coats per 1 000 m².

Mechanical mixing using a heavy duty drill and helical mixer, or a continuous mixer/pump is the recommended mixing method. When using a heavy duty drill/stirrer for single bag mixing (25 kg) the drill/stirrer should provide a minimum of 1100 W input power, 600 W output power, torque 45 Nm and variable speed of 0 to 700 rpm, including a heavy duty paddle having a 120 mm diameter and helical stirrer height of 100 mm suitable for mixing cement mortars and grouts (see typical illustration of a helix stirrer on the last page). The rotation of the stirrer should be such that the material is lifted from the bottom of the mixing container upward during mixing.

Correct mixing and proportioning of the abe.^®screed SLC P is essential for good results.
Add approximately 3.8 L of clean potable water to the mixing vessel and whilst slowly stirring, slowly add the 25 kg of powder. Mix the mortar at a medium speed to blend the water and powder followed by high speed mixing for 1 minute to induce mechanical shear and good dispersion of the polymers to result in a smooth, lump free homogenous consistency, add the remaining water starting with 1.2 L, mix the mortar at a medium speed for 3 to 5 minutes until a lump free homogenous mix is achieved. Generally, 4.5 to 5 L of water per 25 kg should be adequate but do not exceed 5 L of water per 25 kg of abe.^®screed SLC P.

Warning: Mixing must be done carefully by keeping the stirrer head underneath the material to reduce the entrapment of air.

The working temperature of the mix must be in the range of 5 °C to 25 °C. Use warm water (25 ºC) in cold conditions. Excess water may lead to a friable surface and will reduce the strength of the abe.^®screed SLC P. Do not mix more abe.®screed SLC P that can be applied in 10 minutes.

If loss of workability is experienced due to the product standing too long prior to placing, never re-temper the mix by the addition of water, discard the product, and mix fresh product. It is the responsibility of the flooring/main contractor to record the relevant product batch numbers.

Pour or pump the mix over the concrete surface immediately after it has been mixed. For pumped application, ensure the continuity of electricity and water supply is available. Pump the abe.^®screed SLC P onto the floor in a continuous operation, feeding fresh material into a wet edge by means of a triangulated notched trowel or pin rakes to distribute the product.

abe.^®screed SLC P will level out to a smooth, even finish. Where necessary, release small air bubbles from the newly laid screed using a spiked roller. This practice must be adopted within 5 minutes of application to avoid interfering with the final levelling properties.

Bay size limitations by using a temporary stop edge

• Pump applications: 15 m
• Hand applications: 5 m
• Suitable temporary stop edges to be placed in areas where the abe.^®screed SLC P is not required
• For best flowability when placing by hand or pump a minimum thickness of 5 mm is recommended
• Maximum thickness: 20 mm
• The product can be feather edged

abe.^®screed SLC P is to be mixed and laid in accordance with the instructions of a.b.e.^®.

All joints in the sub-floor are to be honoured and not screeded over. Cutting of the joints to coincide with the existing sub-floor joints must take place as soon as the joint edges of the product will not ravel from the cutting process, typically within 12 and 24 hours after product application.

Areas to be screeded must be weather tight, i.e. all roofs, windows and doors are to be covered as this may lead to cracking and crazing. The screed should be protected from draughts and strong sunlight during and for 24 hours after the screed is laid.

Areas to be screeded must be weather tight, i.e. all roofs, windows, and doors are to be covered as this may lead to cracking and crazing. The screed should be protected from draughts and strong sunlight during and for 24 hours after the screed is laid.

1.7 kgm² per mm thickness
34 kg/m² at 20 mm thick

Tools, brushes, and mixing equipment should be cleaned with water immediately after use and before material has set. Hardened material can only be removed by mechanical means.

Ensure the room has sufficient ventilation to allow the screed to dry. Ensure adequate protection from other trades and traffic after installation, access should be restricted for 24 hours. Normal site traffic and erection of partitions on the screed is permitted after the screed has hardened, typically 24 to 48 hours. Prevent contamination/damage by the following trades, e.g. plastering, including water spillage and electrical installations.

abe.^®screed SLC P may be walked on after 6 – 8 hours @ 25 °C, and may be sanded at joints if required 24 hours after application. The floor covering can be installed after 24 hours, depending on the type of finish required, the dryness of abe.^®screed SLC P screed and ambient conditions. It is recommended to do a moisture test to verify the moisture content.

Internal air and floor temperatures must exceed +5 °C. The RH of the concrete floor must not exceed 95%, but where moisture sensitive floor coverings are to be laid soon after the abe.^®screed SLC P application, the RH of the base must be below 75%.

If above 75% relative humidity, use abe.^®prime GCP (undiluted) damp proof membrane as a primer and not abe.®screed acrylic primer between the concrete and abe.^®screed SLC P to enable immediate installation of floor finishes.

It is the responsibility of the main contractor to check the moisture content or relative humidity of the base before floor finishes are laid and that it meets the requirements of the flooring material.

Product safety information required for safe use is not included. Before handling, read product and safety data sheets (MSDS) and container labels for safe use, physical and health hazard information. The safety data sheet is available from your local a.b.e.^® sales representative.

This datasheet is issued as a guide to the use of the product(s) concerned. Whilst a.b.e.® endeavours to ensure that any advice, recommendation, specification or information is accurate and correct, the company cannot – because a.b.e.® has no direct or continuous control over where and how a.b.e.® products are applied – accept any liability either directly or indirectly arising from the use of a.b.e.® products, whether or not in accordance with any advice, specification, recommendation, or information given by the company.

Where other products are to be used in conjunction with this material, the relevant technical datasheets should be consulted to determine total requirements.