Ceresit CT137 - Mineral plaster 1.5mm - WHITE - 25kg
What is Ceresit CT 137?
Ceresit CT 137 is a high-performance Mineral Render designed for thin-layer decorative finishes on external walls. As a cement-based product, it is inherently non-combustible and highly vapour-permeable (breathable), making it the safest choice for high-rise buildings and Mineral Wool insulation systems. It is typically finished with Ceresit CT 48 or CT 49 silicone paint for maximum weather protection.
| Technical Specification | Value / Detail |
|---|---|
| Material Base | Cement and lime with mineral fillers |
| Fire Classification | A1 (Non-combustible) |
| Grain Size | 1.5mm, 2.0mm, or 2.5mm |
| Vapour Permeability | Very High (V1 rating) |
| Consumption | Approx. 2.0kg to 3.5kg per m² |
| Required Primer | Ceresit CT 16 Primer |
| Final Finish | Must be painted (e.g., Silicone Paint) |
- Is Ceresit CT 137 fire rated?
Yes. Because it is a mineral-based cementitious product, Ceresit CT 137 is Class A1 non-combustible. This makes it the mandatory choice for many high-rise residential buildings and schools where strict fire safety regulations (such as those following the Building Safety Act 2022) are in place. - Why does mineral render need to be painted?
While CT 137 provides a beautiful "stone" texture, it is naturally absorbent. Applying a silicone paint like Ceresit CT 48 over the dried render provides the necessary water-repellency (hydrophobicity) and allows for a virtually unlimited choice of colors. - Can CT 137 be used on Mineral Wool insulation?
Absolutely. CT 137 is one of the most breathable renders available. When used with Ceresit CT 190 and Mineral Wool boards, it creates a fully "breathable" system that prevents interstitial condensation and damp.
- Mixing: Pour a 25kg bag into 5.0L to 5.7L of clean water. Mix with a low-speed drill until smooth.
- Substrate: Ensure the basecoat is primed with Ceresit CT 16.
- Application: Apply with a stainless steel float at the thickness of the grain.
- Texturing: Use a plastic float in circular motions to achieve the uniform "stone" (Strukton) texture.
- Painting: Wait at least 3 to 7 days for the render to fully carbonate and dry before applying your final silicone facade paint.
- Pro-Tip on Efflorescence: To prevent "lime bloom" (white patches), do not apply CT 137 in very high humidity or if rain is expected within 24 hours. The paint coat will eventually cover these marks, but proper drying ensures a better bond.
- Pro-Tip on Economy: CT 137 is the most cost-effective way to achieve a high-quality textured finish on large commercial projects where budget and fire safety are the primary concerns.
CERESIT® CT 137 is used for making thin layer plasters on concrete substrates, traditional plasters, gypsum substrates and gypsum cardboards, gypsum fibre boards. We recommend the application of the plaster CT 137 as façade plaster within CERESIT Ceretherm ETICS with the use of EPS or mineral wool boards. We also recommend performing ceilings’ warming within CERESIT Ceretherm Wool Garage System, with the application of mineral lame wool boards. Available pack size: 25 kg