TM Rotavjämning K

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 from cracks, uncoated, free from oil and grease or any other substance 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, if necessary, to ensure proper adhesion. The documented bond strength of the substrate in areas with normal traffic must be 1.0 MPa at the minimum.

Layer thicknesses:
Concrete: 3-50 mm
Lightweight concrete: 6-20 mm
Ceramics/natural stone: 3-50 mm
Chipboard: 3-50 mm *
Wooden floor: 3-50 mm

* The chipboard must be min. 22 mm thick. The floor board/structure must be sufficiently rigid.

Movement joints on the substrate:
Make movement joints, if necessary, 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 30 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 overlap. The screed is separated from the substrate with e.g. a filter cloth, if necessary. Larger areas must be divided into smaller, separated sections.

The surface under a floating surface material must be sufficiently smooth. The surface is sanded or smoothed, if necessary. To floating constructions, the surface materials must be installed as soon as possible. If the floor is left uncovered for a longer period, the levelled 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.

Preparation:
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. Higher temperature is beneficial for the quality and drying time. Maximum temperature +25 °C.

Priming:
When priming with Kiilto Primer 001, always follow 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 the so called primer pump, the primer must always be rubbed onto the substrate with a brush.
If working with non-absorbent substrates, please contact Kiilto contact person (pumpable screeds).

Mixing:
Make sure that the screed is homogenous and consistent, fluid and free of lumps. When making slopes, reduce the amount of water to ensure the right consistency. Water temperature: +5...+20 °C.

Instructions for use:
Kiilto Rotavjämning K is pumped straight from the pumping truck on the subsrtate in stripes. A new stripe is applied on the 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 applied stripe do not exceed 10 meters. Larger areas must be divided in smaller sections.

Check carefully that the drains and other penetrations are properly sealed before applying the screed to avoid clogging up discharge pipes and having screed spilled on surrounding surfaces.

Work the screed with a notched trowel or similar tool to ensure as smooth surface as possible. If applying several screed layers, apply primer between each layer. Let the first layer dry at least 24 h prior to priming. Check and make sure that the surface is so dry that the substrate absorbs the primer. Mixing ratio for priming a new screed layer: Mix Primer 001 in 3-10 parts of water depending on the drying conditions and 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.

Drying:
The drying time of the screed depends on the substrate humidity, layer thickness, air temperature and relative air humidity. Effective air ventilation accelerates drying.
For more information on the product’s self-drying properties, please contact Kiilto contact person (pumpable screeds).

Screed can be applied on concrete with RH 90%.
Note: The screed cannot withstand shrinkage or deformation due to drying of the substrate.

Before installing a surface material, always make sure that the structure of the substrate 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 the floor's humidity with moisture-sensitive flooring materials.

To prevent the screed from too quick drying and cracking, the applied screed should not be exposed to draft, high temperatures or direct sunlight during the first 3 days after application.

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 temperature of the screed, 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.