FAST SPECJAL an adhesive mortar for styrofoam bonding and mesh sealing 25 kg

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Vendor: FAST
Product code: SPECJAL (Szary) 25kg


glue mortar for foamed polystyrene and mesh pouring





FAST SPECJAL M is used to bond styrofoam panels (including panels with the addition of graphite) on all mineral and ceramic surfaces and to make a reinforced layer in building ETICS FAST S thermal insulation systems.


FAST SPECJAL M is a cement and polymeric mortar, water and frost resistant, characterized by high elasticity, vapour permeability and resistance to mechanical loads. It is suitable for virtually any type of building substrate.

Available colours: white and grey


25 kg bag


 Surface preparation

Fixing foamed polystyrene boards:

Surfaces should be strong and free from any type of dirt that reduces mortar adhesion (e.g. residues of old, loose adjacent paints, all kinds of lichen, dust and dirt). Larger unevenness should be levelled with plaster or levelling mortar. Dusty surfacess should be reinforced with FAST GRUNT G. Walls made of highly absorbent materials should be primed with FAST GRUNT U.

Reinforced layer performing:

Before proceeding with the reinforced layer, remember to carefully sand off any irregularities in the surface of the fixed panels with a special grater or abrasive paper and then clean them of loose particles and dust.


Preparation and use

Add the contents of the package to approx. 6 litres of water and mix thoroughly with a slow-running drill until consistent mass is obtained. Then leave for about 10 minutes and stir again before use (do not add water). The mortar prepared  this way is suitable for use for a period of 2.5 to 3 hours. During the works it is necessary to mix the mortar regularly every 30 minutes.

Fixing foamed polystyrene panels:

Properly prepared adhesive mortar can be applied to foamed polystyrene boards in two ways. In case of insulation of even, plastered surfaces, the adhesive mass can be applied to thin layer boards with a toothed trowel with square teeth of 8 -10 mm. In the case of unplastered wall, mortar should be applied to foamed polystyrene boards using the "peripheral-point" method, i.e. using a trowel around the perimeter of the board with a band of approx. 3-4 cm wide, and additionally 3-8 pieces. The size of one piece should depend on the number of  them. The adhesive mortar should cover not less than 40% of a panel surface. Correctly made rims should be far from the edge so that after pressing the board, the glue does not go beyond its outline. Styrofoam panels should be bonded tightly one next to the other, starting from the skirting board up to the roof with the preservation of the passing system of vertical joints. If it is necessary to apply additional protection of the system with the use of mechanical fasteners, their assembly may start not earlier than after 3 days from gluing the panels. The exact number, type and method of arrangement should always be provided by the project of thermal insulation.

Important additional information in case of bonding polystyrene foam with the addition of graphite:

- do not install heated foamed polystyrene,

- Do not allow the panels to heat up during gluing and in the initial period of bonding,

- it is absolutely necessary to use shields on the scaffolding that limit the access to sunlight,

- Non-compliance with the above requirements may result in the release of the glued polystyrene foam.


Application of reinforced layer:

Apply a thin layer of glue about 3 mm thick to the properly prepared surface of foamed polystyrene boards and spread it with a toothed float of 10-12 mm tooth size. In the middle of the layer prepared in such a way we press the glass fibre mesh until it completely sinks. Properly sunken net should not be visible in the face of the layer and at the same time it should be in contact with foamed polystyrene boards. The correct thickness of the reinforced layer should be from 3-5 mm.

During the works it is necessary to observe appropriate atmospheric conditions, i.e. to avoid high temperatures and sunshine, rainfall and high air humidity.

One should not add any amount of extra glue to the dried reinforced layer due to its poor adhesion (too fast evaporation of water from the added layer may result in its weakening and eventually decoupling from the surface).


Important additional information in the case of gluing polystyrene foam with the addition of graphite:

- do not install heated foamed polystyrene,

- Do not allow the panels to heat up during gluing and in the initial period of bonding,

Technical data

Base unit: kg

Base: mineral cement mix with the addition of polymers

Mixture ratio: approx. 6.0 l of water per 25 kg of dry matter

Density of mortar after mixing with water: approx. 1.7 kg/dm3

Open time: approx. 20 minutes

Standby time: from 2.5 to 3 hours

Substrate and ambient temperature: from 5 to 25 degrees Celsius.

Soluble chromium VI content: not more than 0,0002 %.

Adhesion to concrete: min. 0,25 MPa

Adhesion to polystyrene: min. 0,08 MPa




Storage and comments

Store in factory sealed containers in dry conditions at temperatures from +5°C to +25°C. Shelf life is 12 months.

The recommended and stated in the card scope of application of the product or the method of application does not relieve the contractor from carrying out the work in accordance with the construction works and health and safety rules. P.W. FAST guarantees and is responsible for the quality of the product, but has no influence on the way it is used and the conditions under which it was used. All technical data were measured under normal conditions, i.e. +20°C and air humidity of 60%. In case of conditions other than the above, the drying time may change, i.e. it may be longer or shorter.

This card replaces all previous versions.

The product contains cement after mixing with water it gives an alkaline reaction. Avoid direct contact with skin, do not breathe and protect eyes. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. Keep out of children.

This product complies with the European Technical Approval: ETA-14/0464, certified by ETA: 1020-CPR-020-032349, current hygienic certificate. Component of ETICS FAST S thermal insulation system



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