Internal hydraulic lime plaster – Baumit RK 38

Product overview

Where is it used?

• Baumit RK38 is used as base coat for the whole interior of the building.
• Because of it’s high breathability it can be used as a base coat in wet areas such as bathrooms and kitchens and can also be used as a plain finish plaster.
• Because of the fine aggregates used it is suitable for finishing with Baumit Klima Glatte, a very fine hydraulic lime finish plaster.
• As a finishing coat for a more traditional feel.

How is it used?

• Baumit RK38 should be mixed by a plaster whisk with clean tap water to a smooth consistency and then applied by hand or it can be spray applied by machine.
• It is typically applied at a thickness of 10-12mm on to sound substrates but can be applied in layers up to 20mm thick if required.
• Greater thicknesses can be achieved but must be made up in layers of at least 10mm thickness.
• Coats should be gently finished with a grid plane or scraped with the edge of a trowel prior to application of further coats or any finishing plasters.
• Finish coats should be applied at around 3mm in thickness with a trowel or spatula and then sponge finished with a fine sponge.

How much will you need?

Baumit RK 38 has a density of 1.3kg per mm per m² (1mm thickness of plaster over 1m²). Each 35kg bag of Baumit RK 38 will cover up to 2.2m² at 12mm thickness or 8.5m² at 3mm thickness.