A fast-setting and drying, low alkali pumpable screed for thick layers.
- for thick layers
Kiilto Multi is a pumpable, fast-setting screed for thick layers. For indoor use.
Suitable for new build and renovation in homes, offices and public premises. Suitable for overlevelling and patching of concrete and lightweight concrete in interior areas.
Kiilto Multi is used for bonded and unbonded (floating) structures. Compatible with both electric and water underfloor heating. Provides a substrate ready to be covered with a floating engineered wood flooring, waterproofing membrane and ceramic surface material. Can also be used with suitable adherent surface materials in applications that will not be exposed to industrial load.
Priming must always be carried out before the possible final grading.
A low alkaline screed layer protects the adhesive and vinyl coating from the damages caused by alkaline moisture in the concrete. Tests have shown that a 5 mm screed layer provides a protective effect.
+10–25 °C (mixed mass)
> 1,0 MPa
CT-C30-F5 (EN 13813), M1
10 - 40 mm / 2 - 6 weeks (+23°C, 50 % RH)
40 - 60 mm / 6 - 8 weeks (+23°C, 50 % RH)
Thick layers and/or unfavourable drying conditions will retard drying.
For installation of flooring, follow national standards and the flooring manufacturer's instructions
C30 (C>30MPa) EN 13813
approx. 1.8 kg powder/m²/mm
F5 (F > 5 MPa), EN 13813
10-100mm (bonded structure)*
35-100mm (floating structure)
min. 20 mm screed on top of underfloor heating pipes / cables
* When applying thin layers, take into account product’s spreading properties.
approx. 3.2 litres / 20 kg powder (water amount 16%)
< 0.05 %
In an unopened package 6 months in dry conditions
Concrete < 90 % RH
Substrate and room temperature +10-25 °C
Mixed mass must be use within 15 minutes after mixing.
A bonded floor structure:
Ensure that the substrate is suitable for the product, e.g. sufficiently strong concrete. The substrate must be clean, dry, even, free of cracks, uncoated, free of grease and oil and any other substances that might impair adhesion and the final result. Remove cement laitance and smooth out possible irregularities. Smooth and dense surfaces must be sanded mechanically or ground to ensure proper adhesion, if necessary. The documented bond strength of the substrate must be 1.0 MPa at the minimum.
Movement joints on the substrate:
If movement joints are required, make them into the screed layer, down to the substrate. They are placed at the same position with the movement joints in the substrate. Joint width must be 10-15 mm. There may also be alternative solutions.
A floating floor construction:
The total layer thickness must always be 35 mm at the minimum and a steel mesh (Ø3 mm 50x100 mm) or a fibreglass mesh must always be used with the screed. The reinforcement mesh is installed with min. 50 mm overlaps. The screed is separated from the substrate with e.g. a filter cloth. Larger surfaces must be divided in smaller, separated sections.
The surface under a floating surface material must be sufficiently smooth. The surface is sanded or smoothed, if necessary. For floating constructions, the surface materials must be installed as soon as possible. If the floor is left uncovered for a longer period, the floor must be treated with Kiilto Primer 001 primer diluted with water (1 part primer : 3 parts water) on the next day after levelling to prevent the floor from cracks and edge rise.
Correct temperature is vital for a successful result. The substrate temperature must be min. +10 °C. The temperature must be monitored and ensured well before priming. A higher temperature is beneficial for the quality and drying time. Maximum temperature +25 °C.
Always prime the substrate with Kiilto Primer 001 primer according to the instructions given in the technical data sheet. Apply primer 1-48 h prior to levelling, and always let dry before applying the screed. However, do not let the primer dry for more than 3 days, since the construction dust and other impurities may adhere to the primer coat and impair the adhesion of the screed. Note, if the primer is applied on larger areas with a so called primer pump, the primer must always be rubbed onto the substrate with a brush.
In case of non-absorbent substrates, please contact Kiilto contact person (pumpable screeds).
Make sure that the screed is homogenous and consistent, fluid and free of lumps. When making slopes, reduce the amount of water to ensure right consistency. Water temperature: +5...+20 °C.
Kiilto Multi is pumped straight from the pumping truck on the substrate in stripes. Apply a new stripe on a previous one as soon as possible, so that they blend in and form an even and smooth layer. Make sure that the width of the stripes do not exceed 10 meters. Larger areas must be divided in smaller sections.
Check carefully that the drains and other penetrations are sealed properly before applying the screed to avoid clogging up the discharge pipes and having screed spilled on the surrounding surfaces.
Work the screed with a notched trowel or similar tool to ensure as smooth a surface as possible. If applying several screed layers, apply primer between each layer. Let the first screed layer dry for at least 24 h before priming. Check and make sure that the surface is so dry that the substrate absorbs the primer. Mixing ratio when priming a new screed layer: Mix Kiilto Primer 001 in 3-10 parts of water depending on drying conditions and the substrate's absorbency. Apply primer twice, if using over 7 parts of water.
Semi-hardened screed is easy to mold or cut. If planning to make levellings, do not wait too long.
The drying time of the screed depends on the substrate humidity, layer thickness, temperature of the substrate and air and relative air humidity of the area. Effective air ventilation accelerates drying.
For more information on the product’s self-drying properties, please contact Kiilto contact person (pumpable screeds).
Kiilto Multi can be applied on concrete with RH 90%.
Note: The screed cannot withstand shrinkage or setting due to drying of the substrate.
Before installing a surface material, always make sure that the substrate structure is dry enough. The given drying times require a dry substrate, favourable drying conditions (approx. +20 ° C, RH 50%) and good ventilation. Pay special attention to floor's humidity level with moisture-sensitive flooring materials.
To prevent the screed from too quick drying and cracks, the applied screed should not be exposed to draft, high temperatures or direct sunlight during the first 3 days after application.
Underfloor heating can be switched on after 28 days from levelling.
Water underfloor heating with accurate temperature control can be brought up to its operating temperature gradually after two weeks. Start by raising the temperature to +15 °C or to floor's current temperature, if it is higher. After that, the floor temperature can be raised by 2 degrees every third day. If the room temperature is much lower than the screed's temperature, the floor temperature must be raised slower.
The information given in this product data sheet is based on our tests and our practical knowledge. The technical data is defined in standard conditions. Variations in local working conditions and methods will affect the product performance and result. The result is also strongly affected by working methods. We guarantee the high quality of our products according to our Quality Management System. No liability can be accepted from incorrect use of the product or prevailing conditions, over which we have no control. Thus, we cannot be held responsible for the final result. To use the product properly, please read the product brochure, work instructions and the safety data sheet available at www.kiilto.com.
Avoid unnecessary skin contact and exposure with the fresh product, use safety gloves. Refer to the material safety data sheet. For information on product and package disposal, visit www.kiilto.com.