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Heraklith Insulation

Ceiling installation being installedHeraklith insulation boards are sustainable produced breathable thermal and acoustic insulation panels. Heraklith is the original Woodwool panel having invented the product over 100 years ago. Boards can be supplied in two grades; standard or superfine. The standard grade uses woodwool fibres with diameter of 1.5 to 2.0mm giving a rustic appearance whereas the superinfne grade uses fibres with a 1.0mm diameter; see photographs below.

Boards with specific Sound Absorption, Thermal Insulation and Fire Protection properties can be designed which are known as "Combi Boards." These are made by combining the Woodwool panel with either Knauf Insulation's environmentally friendly mineral wool (Earthwool), phenolic foam or polystyrene.

To see what products can be designed use the PRODUCT GENERATOR on our specific product site:

The main component is shredded wood, or ‘wood wool’ which gives the product its distinctive appearance. In the past Magnesite was used to bind the wood wool but our latest generation uses cement. Cement makes the boards weather resistant and sufficiently durable to be used externally. Cement also and makes them suitable to be used as passive fire protection panels.

Other Woodwool insulation panels may be made with Magnesite – those are not designed for external use but boards supplied by Marmox are cement bonded so will not degrade or rot.

Soundproof panelsSound Absorption Panels

Heraklith sound insulation boards are seen in restaurants, schools, theatres, recording studios and sports halls all over the world. Our sound absorption products are perfect for lining walls and ceilings where sound is echoed where because of their cellular structure they absorb sound that would normally be reverberated. Decorative boards (1.0mm / superfine grade) are popularly used as suspended ceiling panels as are Tektalan boards (combi boards with rock mineral wool)

Sound absorption in schools is especially vital to the successful delivery of lessons. It is a requirement under BB93, in a revision of Part E of the Building Regulations, that noise reverberation is kept within specified levels. A 50mm Heraklith panels provides a weighted sound reduction (RW) of between 56 and 67dB.

Breathable External Wall Insulation (plaster/render carrier board)

Heraklith boards are breathable so can be used with a lime render to provide a durable weather resistant external insulation. Breathability is vital to the health of the wall as it reduces the potential for interstitial condensation. Unlike some woodwool panels available, Heraklith boards are waterproof, freeze-proof and damp-proof.

The thermal conductivity of the standard panel is 0.08W/mK. For greater thermal insulation there are “combi” versions available with layers of rock mineral wool, phenolic foam or polystyrene attached.


Because they are made only PEFC certified wood, using Heraklith boards which are certified by Blue Angel and the Environmental Construction Products Organisation guarantee that you are using natural and sustainable product. Heraklith wood wool products now have Environmental Product Declarations (EPDs), based on the Life Cycle Assessment. This allowed us not only to quantify the benefit of using wood as a raw material and the impact of the binder, but also to make proper comparison between the environmental impact of product.

Fire Protection Panels

Heraklith wood wool panels act as a heat shield and protect the construction during fire. The standard panels have a Euroclass rating of B with up to 90 minutes fire resistance. Heraklith offers multilayer boards with limited combustibility or, which are non-combustible boards (A2 class). They do not melt or produce burning droplets, and are rated in the best class in terms of smoke.

Cross-section of the Heraklith woodwool board.Is Heraklith right for your project?

Heraklith panels are multifunctional boards with several uses. In the UK the main uses are as acoustic and thermal insulation panels to reduce noise and with EWI as a breathable base board for lime and other breathable renders. In mainline Europe Heraklith is used for passive fire protection – especially in underground car parks, hygroscopic humidity regulating panels and even as noise barriers at the side of motorways.

If you have a specific U Value, Sound Absorption factor or reduction in decibel requirement we can provide you with a board to meet these requirements. Typically, this would be a combination board which are Woodwool boards bonded to a layer of insulation material. These are: TEKTALAN (Combi board with Rock Mineral Wool) providing acoustic, thermal insulation with outstanding fireproofing, HERATEKA (Combined with Expanded Polystyrene) offering lightweight waterproof thermal insulation or HERASOL (Combi with phenolic foam) giving the ultimate thermal insulation)

Why use Heraklith instead of other Wood Wool boards?

KNAUF INSULATION have invested millions in the new state of the art factory in Holland. This has ensured that the quality of GENUINE Heraklith range is superior to its competitors and to the earlier versions that were available several years ago. Wood wool is naturally durable. It has the same service life as the building in which it is used and will require no special maintenance.

Heraklith is of course CE marked and conforms to European Standard for Wood Wool Insulation EN13168.

Marmox - the thermal insulation experts

Here at Marmox, we are experts in providing sustainable and cost-effective building products to construction and refurbishment professionals around the UK and Ireland.

As well as Heraklith boards for EWI and acoustic insulation, we offer Marmox Multiboard for waterproofing and insulation in addition to our Thermoblock which eliminates thermal bridging at the wall floor junction.

For Heraklith purchases please phone us direct using the number on this website.

For further information on Heraklith thermal insulation products please click here to visit the website.



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