£25.19 (inc. VAT £30.23)
Pure lime render/plaster for internal & external application on all types of masonry walls. Can be used as levelling coat prior to wood fibre application.
26 in stock (Available for Backorder)
Cement-free, natural white, lime render for external and internal areas. Suitable as a base coat and finish coat. Specially developed for greater thicknesses.
• For thicker applications
• Natural white lime
• For external & internal use
Lime based render for direct application onto all types of new and existing standard masonry.
| Grain Size [mm] | Colour | Bag Size [kg] | Consumption [kg/sqm/grain size] | Coverage/bag [sqm/10mm] | Bags per pallet |
|---|---|---|---|---|---|
| 0 – 3 | Off White | 35 | 1.3 | 2.7 | 36 |
Frequently Asked Questions (FAQs)
What is BAUMIT Klima RK 39 Pure Lime Render?
BAUMIT Klima RK 39 is a pure lime plaster/render supplied as a factory-prepared, cement-free dry powder. It produces a breathable, natural white plaster suitable for internal and external applications and is part of the healthy living product range.
Where can RK 39 be used?
RK 39 can be used on external and internal masonry substrates, including stone, brick, block and concrete. It is suitable as both a basecoat and finish coat for walls and ceilings, and can also be used as a levelling coat prior to wood fibre board installation.
How does RK 39 differ from other lime plasters?
RK 39 has moderate strength development with a lime binder designed to reduce stress in the plaster coating. It is considered healthier than gypsum or cement-based renders, breathable, and can be used across whole buildings from basement to roof.
How do I mix and prepare RK 39 plaster?
To mix RK 39:
1. Add the dry powder to clean water in a tub.
2. Mix with an electric hand mixer or render spraying machine until lump-free and creamy.
3. Let the mix stand for about 5 minutes, then remix before application.
Mixed plaster has a working time of approximately 1.5 hours.
What thickness should I apply for basecoat and topcoat?
• Basecoat: Minimum 10 mm, typical 15 mm, maximum 20 mm per coat; up to 30 mm total in multiple coats (each at least 10 mm).
• Topcoat: Minimum 5 mm, maximum 8 mm; surface can be rubbed with a fine sponge for a smooth finish.
Can RK 39 be used in wet rooms?
Yes. RK 39 is suitable for use in wet room environments due to its composition and breathability.
What technical performance characteristics does RK 39 have?
Key performance values include:
• Reaction to fire classification: A1 (non-combustible)
• Compression strength: 1.5 – 5 N/mm²
• Adhesive tensile strength: ≥ 0.08 N/mm²
• sd-value (vapour diffusion): 0.05 m
• Thermal conductivity: ≤ 0.820 W/mK
• These make it a robust, breathable plaster/render suited to modern and traditional builds.
How much coverage does a 35 kg bag of RK 39 provide?
• Basecoat: About 1.7 m² at 15 mm thickness
• Topcoat: About 5.3 m² at 5 mm thickness
• Actual coverage varies with substrate texture and application technique.
What storage conditions are recommended?
Store RK 39 dry and well wrapped on pallets, protected from moisture, for up to 6 months before use.
