Hemplith lightweight hemp board


The lightweight construction board is a fully ecological, diffusion-open and fire-resistant dry construction board for interior use and interior fittings. It consists of hemp (an annual renewable raw material) and minerals. It is used as a living space panel for thermal insulation, mold remediation, construction panels, interior finishing, roof extensions, partition walls and moisture control. It creates a healthy and pleasant indoor climate.

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Substrate preparation

In order to provide you with the best possible service, we recommend that you follow the applicable regulations in the event of mold infestation and make the substrate load-bearing and free of old coatings such as oil paint or dispersions. Any unevenness or protrusions can be evened out with a suitable mortar such as lime plaster. To achieve a smooth surface, you should roughen the plaster. If the substrate is highly absorbent, you should prime it with a primer before continuing work. It is also important that the substrate is free of loose old coatings.

For drywall applications, we recommend that you use standard techniques and erect a substructure with a maximum stud spacing of 40 cm. For slopes and ceilings, we recommend a maximum stand spacing of 30 cm. We are happy to provide you with further information and support for drywall applications.


To attach hemp building boards to existing walls/ceilings, we recommend that you apply diffusion-open reinforcing mortar with an 8-10 mm notched trowel over the entire surface and bond the boards over the entire surface. The adhesive mortar can be applied either to the wall surface or to the panel. For the ceiling, we recommend additionally securing the panel with screws and washers. The edge joints should remain free of adhesive mortar. Align the panels and press them flat with the whole palm of your hand. Lay the boards in a bond with at least 30 cm offset and interlock them in room corners.

Reinforcement is not absolutely necessary, but is recommended for high-traffic areas (material: flax fabric, jute or fiberglass). If no subsequent reinforcement is planned, the joints should be filled with adhesive mortar. After the adhesive mortar has hardened (at least 12 hours depending on temperature and humidity), the final coat can be applied with a thin, diffusion-open plaster (e.g. lime, clay). We recommend applying edge protection to corners subject to stress.

Please observe the respective processing guidelines as well as the relevant standards and generally recognized rules of technology. Do not use diffusion-tight final coatings such as emulsion paints, wallpaper or plaster.



Process lightweight hemp building boards with a conventional jigsaw, hand saw, circular saw or band saw.


Hemplith lightweight boards must be stored horizontally and dry on solid surfaces in ventilated buildings.

Hazard warnings


Technical data sheet: Request

Download technical data sheet Hempllith lightweight board