CT 85 Adhesive and reinforcing mortar EPS - Winter
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Ceresit CT 85 Adhesive and reinforcing mortar EPS - Winter

For fixing Expanded Polystyrene boards as well as for applying a thin reinforced layer for thermal insulation of buildings

 

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Description

  • Enables application in lower temperatures
  • High adhesion to mineral substrates and EPS-boards
  • Vapour permeable
  • Resistant to weather conditions, hairlines and cracks
  • Reinforced with fibres
  • Amount required:
    • Fixing of EPS-boards: approx. 5.0 kg/m2
    • Reinforced layer: approx. 4.0 kg/m2

CT 85 is used for fixing polystyrene boards and for applying reinforced layer. It can be used under winter conditions, i.e. at ambient temperatures down to 0 °C during work and a max. temperature drop to -5 °C is possible. Additional fixing with mechanical fasteners is required. Economical in use, vapour permeable. The mortar ensures rapid improvement of durability.

1. Fixing EPS-boards CT 85 Winter mortar shows good adhesion to carrying, compact and dry substrates, such as surfaces of walls, plasters, mosaics and concretes free from grease, bitumen, dust and other substances decreasing adhesion. The substrates, to which the mortar CT 85 Winter will be applied, should be covered with neither frost, ice nor snow. The adhesion to the existing plasters and paint coatings should be checked. “Hollow” plasters should be removed. Any surface contaminant and other adhesion impairing substances, steam-tight paint coatings and the coats with low adhesion to the substrate should be completely removed. In case of mycological contamination with fungi, moss and algae, the surface of the façade should be cleaned with steel brushes and, then saturated with a fungicide solution of Ceresit CT 99 in compliance with technical instruction. The old, not plastered walls, strong plasters and paint coats should be dusted. Substrates with high water absorption, e.g. walls made of aerated concrete blocks or silicate blocks should be primed with Ceresit CT 17 and left for drying for at least 4 hours.

2. Armoured layer application. When CT 85 Winter is set (not earlier than after 6 days in case of mild winter weather conditions), the boards should be ground with abrasive paper and additionally, must be fixed with mechanical anchors. There can be neither frost, ice nor snow on the surface of the EPS-boards. If EPS-boards have not been covered with the armoured layer for 2 weeks, then their quality should be evaluated. The yellowed boards with dusting surface should be ground with coarse abrasive paper.

CT 85 Winter should be poured into the measured amount of cool clean water and stirred with the drill by means of a mixer until the homogenous mass is obtained without lumps. It is recommended to use warm water when the mortar is applied in lowered temperatures (from 0 °C to +5 °C).
1. Fixing EPS-boards. The ready mortar should be applied with a trowel along the board edge forming a strip of 3÷4 cm wide and a few spots with the diameter of approx. 8 cm. Then immediately, the board should be pressed to the wall with a few slight blows of a long float. The properly applied mortar when pressed should cover minimum 40 % of its surface. In case of even, smooth substrates the mortar should be applied by means of a toothed long float (teeth 10–12 mm). The boards should be fixed tightly one at the other in one surface with the preservation of “brick like manner” of vertical connection. The number of anchors should be min. 4 per m2. The stripes of 2 m wide located along the building edges are exposed to the strongest wind powers and the number of anchors should be increased in these places up to min. 8 per m2.
2. Armoured layer application. The ready mortar of 3÷4 cm-thick layer should be spread along the surface of the boards by means of a smooth long steel float. The glass fibre mesh should be applied on the fresh mortar (with 10-cm overlaps) , and then the second 1cm-thick layer should be applied and smoothed evenly so that the glass fibre mesh should not be visible. Fresh stains should be cleaned with water while hardened elements should be mechanically removed only.

Data sheet

Data sheet
Model
CT85 Winter
Usage/Coverage
4.0-5.0 kg/sqm
Size
25 kg
Unit
bag