- 25 kg bag / 24 liters wet mortar.
- Hemplith hempstone mortar
- Yield: approx. 1.2/1.6 m² per bag with 20/15 mm application thickness
The HP 9L natural lime base render is a versatile lightweight render suitable for both interior and exterior use. It can be applied to various substrates such as masonry, rough-formed concrete, pumice concrete and poured concrete. In the case of highly absorbent substrates or very warm weather, it is necessary to pre-wet the substrate in order to ensure optimum adhesion. If necessary, the freshly applied plaster should be moistened with water to optimize processing.
For concrete ceilings, pre-treatment with HP 14 lime adhesive plaster, applied with a notched trowel, is recommended. Once this has hardened sufficiently, the HP 9L can be sprayed or applied to a thickness of around 10 mm.
The use of HP 9L is particularly advantageous on soft and flexible substrates such as clay bricks in timber-frame construction or as a base coat on interior insulation. The expanded glass content in the plaster gives it a high degree of flexibility, which makes it possible to effectively compensate for movements in the substrate. According to the clay building standard, a maximum layer thickness of 15 mm is prescribed for lime plaster when using clay bricks of application class 1A in timber-frame construction. However, the lightweight HP 9L also allows a thickness of 20 mm, as is usual for external plasters, without impairing the load-bearing capacity of the clay blocks.
The HP 9L is also an excellent choice for laying light clay bricks or Hemplith hemp-limestone bricks, where its high mobility and adaptability to soft substrates is particularly appreciated.
In terms of composition, HP 9L consists of natural hydraulic lime, quartz sand, mineral lightweight aggregate and a small addition of cellulose. It contains no synthetic binders, is highly permeable and resistant to fungal and mold growth. The thermal conductivity of the plaster is 0.2 W/(mK), and the expanded glass components remain closed-pored even after processing with a plastering machine, which means that the insulating effect is retained.