Grenaisol Insulating and structural board


Grenaisol insulation and structural boards are made of exfoliated vermiculite and a special inorganic binder, providing a high resistance to thermal shock and high insulation.
They are harmless to one's health and free of any asbestos, glass or mineral fibres. They have sufficient strength and mechanical stability.
Grenaisol boards are very stable and do not release any vapours even at high temperatures.
Grenaisol boards can be used not only as a healthy material for easy construction of your fireplace shell or insulation chambers of a tiled stove but at the same time, they help to ensure sufficient insulation, and all-in one step!!

For more information about our company, of any material or to make any suggestions please contact our specialists or send us an E-mail, we will be more than please to assist you to the best of our abilities!

Grenaisol boards can be used not only as wall insulation behind a heat source but also as a building & structural element for a fireplace shell without any other additional supporting structures.Grenaisol board is sufficiently firm to ensure the, necessary fireplace shell rigidity and durability and, at the same time, it has excellent insulating properties with a relatively low thickness (30 - 50 mm). Temperatures inside the fireplace shell may reach 500 °C.
Thin-coat plaster can be easily applied and spread on Grenaisol boards. This material can also be tiled with a ceramic lining.

We have been developing our products constantly. They undergo laboratory tests and we listen to our customers´ reactions. The result is a new concept of the board with perimetr frame. This frame increases the edge strength during the handling with a board and helps to join boards more accurately.

For easier and faster construction of a high-quality fireplace enclosure and larger design enclosure that become the dominant of the interior, Grena a.s. developed a special variant of Grenaisol board, Grenaisol Pro. The size of these boards (600x1200, 800x1200 mm) allows comfortable design of the wide fireplace enclosure.

For the construction an arc shape of the fireplace enclosure we offer a special shape piece Grenaisol Arcus, with which you can easily create arcs with a radius of 175 mm. The special locking of the panel ensures full insulation of the wall even with varying arches, so there is no weakening of the insulation wall.

See how simple is the construction of the fireplace with Grenaisol boards (play video).

 You can also find interesting tips in the assembly instructions here.

Main Advantages:
  • no other mounting components are required
  • high-quality, quick and economical solution
  • easily workable using standard tools
  • easy finishing
  • ecological and natural material
  • long-term stability of the material
  • recommended by experts in the stove-construction field
Format (mm) Thickness (mm)

800 x 600


1000 x 610


Stress-strain diagram for determining Grenaisol board thickness in accordance with EN 18 892. Application: fireplace lining or tiled stove construction. Grenaisol is used as a substitute for heat insulation by mineral wool in accordance with AGI Q 132.


Fireplace shell construction using Grenaisol boards:

Build a fireplace shell using grenaisol - structural and insulation board in one! Grenaisol board is completely harmless to the health  and ecological. No dust particles or fibres are released from the board and no vapours occur even when the board is heated to high temperatures. Grenaisol board has grooving on one side and a smooth surface on the other.

The grooving is designed to enable use of the best glue or plaster adhesives possible. When using the board as wall insulation, attach the board with its grooved side to the wall. When applied on the outside of the fireplace shell structure, the grooved side should face outwards and be used as a base for applying a estructural net and plaster, or glue and ceramic tiles. Choose the Grenaisol board thickness which meets your requirements - the thickest board (50 mm) provides better insulation, while the thinner one (30 mm) is suitable when you need to save space inside the fireplace lining.

Use wood screws or staples to join the Grenaisol boards and apply Grena Klebepaste glue on all surface in contact. All you need is standard tools such as a circular saw, a drill, wood rasp, etc.

Grenaisol boards are very easy to work with.

Machining with normal wood working tools

řezání řezání vrtání sponkování šroubování frézování frézování tvarů drážkování
Manual shape cutting Cutting Drilling Coupling  Screwing Milling Milling of shapes Grooving


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