microfibre reinforced adhesive for mineral wool


Project Description

microfibre reinforced adhesive 

for mineral wool



Dry, frost-resistant, mineral adhesive based on polymer-modified Portland cement, polyurethane fillers, and selected aggregates (including light aggregates) for manual or machine application. It is especially recommended for bonding mineral wool insulation boards to the substrates a part of TERRIX® EWI3, EWI2, EWI3 external wall insulation system and CIS-1 carpark insulation system. It may be applied on all typical mineral substrates such as e.g. concrete, lightweight concrete, expanded clay aggregate, ceramic brick and silicate brick as well as porous ceramics. Can be used with mineral wool lamella insulation boards.

Files to download


Main properties:

  • High resistance to shrinkage;
  • Optimal mechanical strength;
  • High adhesion to the substrate and EPS;
  • Easy application;
  • Contains microfibres and basalt fibres;
  • Multi-purpose use for bonding and creating a reinforcement layer on EPS.

Technical Data

Base binder: a mixture of hydraulic binders with the addition of modifiers, reinforced with microfibres;
Colour: light grey;
Mixing ratio: 6 litres of water per 25 kg of mortar;
Application time after adding water: not less than 2 hours;
Consumption: ca. 5-5.5kg/m2;
Open time: ≥20min;
Temperature of application (air and substrate): from +5°C to +25°C;
Reaction to fire: class A2-s1,d0;
Packaging: Disposable paper bags containing 25 kg of the product;
Storage: The product should be stored in its original sealed packaging in a dry frost-protected room;
Shelf life: 12 months from the manufacture date specified on the packaging, provided that the storage requirements are observed. It is recommended to use the product within 6 months.

CAUTION: Keep the product out of reach of children.


Substrate preparation:

Apply to a sound and clean substrate (without cracks and delaminations), degreased, even and dry, and free of biological contamination or chemical efflorescence. The substrate should be free of algae/ fungi growth. In case of microbial contamination, the substrate should be cleaned with a power washer—subsequently, good quality antifungal solution for removing microbial contamination to be applied as per the product manual. Any loose layers that are not bounded to the substrate (such as loose render or flaked paint) should be removed.
Wash and degrease old or dirty substrates with water and a cleaning agent. If there are any large irregularities to the substrate, these should be levelled out by using a levelling compound, e.g. Terrix RD-LB. Small irregularities can be levelled with levelling render, e.g. Terrix RN-LF 8. Before applying the levelling compound/render – refer to the product manuals and datasheets. Absorbent substrates should be primed before levelling compound is used.

Note: the finish coat may not be applied on newly completed mineral substrates (i.e. cement, concrete, and lime mortar renders) – min.: of 2 weeks curing period is required.

If the product is being used as a part of TERRIX render systems refer to the system manual for detailed application instructions. If any substrate unevenness exceeds 1 cm, use a levelling compound first. Absorbent substrates should be primed with Terrix PR-AC-P before levelling compound application.


Gradually pour the contents of the packaging into a container with a measured amount of clean and cold water (approx. 6 litres) while continuously mixing the mass (with a low-speed mixer fitted with a basket stirrer) until a homogeneous mixture is obtained. After waiting for 5 minutes and remixing, the mortar is ready for use. After adding water, the mortar must be used up within approx. 2 hours (at an ambient temperature of +20°C).

Fixing mineral wool slabs:

The prepared cement mortar to be spread in the places where the mortar will be applied later on by means of the ribbon and dab method. The ribbon should be 30÷60 mm wide and should be applied onto the perimeter of the slab. In addition, 6 to 8 dabs of mortar (approx. 100÷120 mm diameter) should be evenly placed on the remaining part of the slab. The ribbons must be formed in a prism shape. To do so, spread it with a trowel set at an angle of 45° towards the slab surface. Once the mortar is applied, the slab must be immediately put onto the wall in its appropriate place and pressed to flush it with the neighbouring boards. Boards must be tightly fitted next to each other using the staggered method. Excess mortar coming out from board joints must be removed so that no mortar is left on the slab edges. Properly applied mortar must cover not less than 40% of the slab surface, and the adhesive layer thickness should not exceed 10 mm. After allowing sufficient time to cure (at least 48 hours), the boards should be fixed by means of applicable mechanical fixings pursuant to the thermal insulation project.

Fixing lamella wool:

Use a stainless steel trowel; the prepared cement mortar should be spread from the side it is applied on. Then, thin cement mortar should be applied on the surface prepared in such a way by means of an even layer with the use of a notched trowel (12 mm). Afterwards, the slab must be immediately put onto the wall/ceiling in its appropriate place and pressed with the trowel. Properly applied mortar should cover the whole slab surface, and its thickness should not exceed 10 mm after attaching the slab.


It is assumed that the mortar’s initial setting period is min. 3 days (typical drying conditions 20°C, 65% RH). Note: Low temperature and high relative humidity essentially prolong mortar drying time.

Useful hints:

To be applied on dry days at temperatures between 5-25°C. Avoid working on surfaces directly exposed to the sun and in strong winds. Note: The product is alkaline. Therefore, it is necessary to protect the eyes and skin. Safety clothing (PPE) must be worn while carrying out any installation work. In case of contact with eyes, immediately rinse them thoroughly with plenty of water. If irritation develops, seek medical assistance.

The product is alkaline. Therefore, it is necessary to protect the eyes and skin. Safety clothing (PPE) must be worn during installation work. In case of contact with eyes, immediately rinse them thoroughly with plenty of water. If irritation develops, seek medical assistance. 


Case study

Terrix PL-SX Spray Plaster

December 8th, 2022|Case study|

Terrix PL-SX Spray Plaster Ready-to-use plaster coat for machine levelling of interior walls and ceilings. ⋅ Chemically bonded product ⋅ No risk of cracking or flaking ⋅ Chemical accelerated set [...]

Related Products

Related Systems


My name is….

My name is….

My name is….

My name is….

Go to Top