Kiilto Pro Plan Therma

Fiber-reinforced, fast-setting, normally drying, self-levelling screed for thick levellings and smoothings, floating floor structures and underfloor heating floors.

Special features

  • pumpable
  • thick levelling and smoothing layers
  • for floors with underfloor heating and floating floors with impact sound insulation
  • low alkali
  • fibre-reinforced




Kiilto Pro Plan Therma is a pumpable, fast-setting screed for thicker 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 Pro Plan Therma can be used for bonded and unbonded (floating) structures. Compatible with both electric and water underfloor heating. Provides a substrate that is ready to be covered with a floating engineered wood flooring, waterproofing membrane and ceramic surface material. Can also be used with suitable glued surface materials in areas where there is no heavy load or repetitive, local stress on a small area.

Always prime the screed layer if laying a finishing top layer onto it.

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.

Application temperature

+10–25 °C (mixed mass)

Classifications and certificates

CT-C20-F4 (EN 13813), M1


10 - 40 mm / 1 - 5 weeks (+23°C, 50 % RH)
40 - 60 mm / 7 - 9 weeks (+23°C, 50 % RH)
Thicker layers and/or unfavourable drying conditions will retard drying.

For installation of flooring, follow national standards and the flooring manufacturer's instructions

Compression strength

C20 (C > 20 MPa), EN 13813


approx. 1.7 kg powder/m²/mm

Fire class


Flexural strength

F4 (F > 4 MPa), EN 13813

Layer thickness

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.

Mixing ratio

approx. 4.5 - 4.75 litres / 25 kg powder (water amount 18 -19%)


< 0.02 %


Can be stored in an unopened package in dry conditions for 6 months.

Substrate humidity

Concrete < 90 % RH


Resin-cement-quartz sand based powder


1–3 h

Working conditions

Substrate and room temperature +10-25 °C

Working time

Mixed mass must be use within 15 minutes after mixing.


< 11

Instructions for use

A bonded floor structure:
Ensure that the substrate is suitable for the product, e.g. sufficiently strong concrete. The substrate must be clean, dry, free of cracks, uncoated, free of oil and grease and any other substances (such as laitance) that might impair adhesion and the final result. If necessary, smooth and dense surfaces must be sanded mechanically or ground to ensure proper adhesion. The bond strength of the substrate must be 1.0 MPa at the minimum.
Movement joints on the substrate:
Possible movement joints are made in the screed layer, throughout the layer thickness. They are positioned in the same place as the movement joints on the substrate. Joint depth must be 10-15 mm at the minimum. 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 Kiilto 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 surfaces must be divided in smaller, separated sections.

A floating screed slab must be sufficiently even. If necessary, the substrate is levellled by sanding or levelling before pumping. To avoid cracks, the screed can be treated with Kiilto Pro 704 BSP Curing agent. This may be necessary especially if the indoor air is very dry and the screed layer will be uncoated for several months.

Temperature is vital for a successful result. Minimum substrate temperature is +10 °C. The temperature must be monitored and checked well in advance before priming. A higher temperature is beneficial for both quality and drying time, but must not exceed +25°C during installation or drying of the screed.

Always prime a bonded structure with Kiilto Primer 001 primer according to the instructions given in the technical data sheet. Apply primer at least 1 h before levelling, and 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 sprayed on the substrate, the primer must be rubbed onto the substrate with a brush.
If necessary, non-absorbent substrates must be sanded and primed with Kiilto Pro Fix Primer. If case of questions, please contact Kiilto contact person for pumpable floor screeds.

The screed must be homogeneous, fluid and free of lumps. The amount of water may be reduced to make the product stiffer (for slopes) or to speed up the drying of thick layers. Water temperature: +5...+20 °C.
Instructions for use: Kiilto Pro Plan Therma is pumped 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. The width of the stripe to be applied at a time shall not be more than ca. 10 meters. Larger areas must be divided into sections.
Check 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 other surfaces.

Work the screed with a notched trowel or similar tool to ensure as smooth surface as possible. In underfloor heating structures, the surface is finished with a wobbling tool or a flat trowel. If applying several screed layers, apply primer between each layer. Let the first layer dry at least 24 h before priming. Monitor and check that the surface is so dry that the substrate can absorb the primer. Mixing ratio when priming a new screed layer: Mix Pro Primer 001 in 3-10 parts of water depending on drying conditions and substrate's absorbency. Apply primer twice, if using over 7 parts of water. Apply primer twice to very porous concrete and light concrete [1:5 (1st application), 1:3 (2nd application)].

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, the layer thickness, the temperature of the substrate and air and the relative air humidity of the area. Effective air ventilation accelerates drying.
For more information on the product’s drying properties, please contact Kiilto contact person for pumpable screeds.

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

Before installing the surface material, make sure that the substrate structure is dry enough. These 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 when installing moisture-sensitive flooring materials.

To prevent the screed from drying out too quickly and causing cracks or imperfections in the substrate, the screed should not be exposed to draft, high temperatures or direct sunlight for the first 3 days after application.

Underfloor heating can be switched on only after 28 days from levelling.

Due to more accurate control system, water underfloor heating 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.

Additional information

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

Environment and safety

Avoid unnecessary skin contact and exposure with the fresh product, use safety gloves. Please refer to the material safety data sheet. For information on product and package disposal, visit