Our products

Award-winning LIGNIA Fire is a major break-through product in the US construction market, with the same visual beauty and high performance of our regular LIGNIA wood product but with enhanced fire retardancy built in. Independently tested according to ASTM E2768, LIGNIA Fire has repeatedly achieved a Class A flame spread rating extended to 30 minutes. This standard uses the apparatus and methods set out in ASTM E84 with the total test period extended to 30 minutes. 

It is suitable for the same construction applications as LIGNIA, especially decking and sidings, and in addition, windows, doors and other types of interior and exterior millwork applications. 

As it has built-in flame-retardant properties that are locked in for the life of the product, there is no need for costly and time-consuming additional treatment with fire retardants.

This is unprecedented for any wood and is testament to LIGNIA's team of scientists and modification technical experts. 

It is also approved for use in schools in the US. The CDPH Emissions Compliance Test - California Dept. of Public Health Version 1.2. The resin used is compliant with the performance standards established for low-emitting materials under the collaborative for high performance schools (CHPS) 2109. 

This product is currently available in the USA.


Is LIGNIA Fire accepted by US architects? 

Architect's Newspaper  Architizer


Architizer awards


LIGNIA Fire has won major awards in America, including 'Best of Products' at The Architect's Newspaper Awards in the Timber category, impressing a jury of 12 leading architects, engineers, construction and design professionals. LIGNIA Fire has also been recognized by prestigious Architizer magazine with a Special Mention in the 2020 Architizer A+Awards for all its properties including beautiful color, sustainably sourced material, and exceptionally low flame spread. Significant numbers of architects in the US are now specifying LIGNIA Fire in 2020.

How does LIGNIA Fire perform?

Independent laboratory tests have confirmed that LIGNIA Fire offers Class 1 Durability against decay fungi and provides a high resistance to termite attack. It is also classed as a small movement timber, similar to teak or Western Red Cedar. That equates to minimal shrinkage and swelling despite environmental conditions, giving you a product you can depend on.

Used in external applications and left uncoated, the timber will silver over time as with other natural wood products. This is due to the interaction of UV and rainfall with the wood surface. However, the rate of this change will depend on the level of exposure to the outdoor elements.

All of our wood is graded to a high standard, with tight limits on its splits and surface checking. Your wood will undergo quality checks before we send it out to you to ensure it meets our exceptional standards.

LIGNIA Fire is manufactured under the ISO 9001 Quality Management System and periodic sampling and re-testing of fire performance is undertaken to demonstrate this.


What is LIGNIA Fire like to work with?

With no need for additional treatments, LIGNIA Fire is ready to use as soon as it arrives at the construction site, saving you time as well as money.

LIGNIA Fire saws, planes and sands well to a good finish – you should set your machinery up for a medium density hardwood, such as Iroko. It can also be glued and painted in the same way as other timber. To reduce potential end checking over time, or if coatings are being applied, we recommend an end sealant be applied.

Independent testing and regular QC checks on LIGNIA Fire have shown it to be pH neutral or slightly alkaline. As it is not acidic, regular stainless steel or other metal fixings can be screwed his means no additional treatments using flame retardants should be required, saving costs and time. It remains the responsibility of the final product manufacturer to demonstrate their product retains this classification following profiling. Where local City and State regulations are in place, then additional testing may also be required.


How is LIGNIA Fire sustainable?

LIGNIA Fire is manufactured from softwood harvested from sustainably-managed plantation forests. All the timber we use is FSC® certified.

Carbon dioxide sequestered by these trees as they grow remains locked in the wood over the life of the product. Since LIGNIA products are durable, there is less of a need to replace these, reducing demand for wood to manufacture replacements.

Where LIGNIA products cannot be re-used at the end of their service life, they are suitable for use as biomass.


LIGNIA Fire profile

LIGNIA Fire is supplied FSC® certified, kiln dried, with minimal visual defects, random grained (flat sawn). It is available in lengths from 2.1m to 6m and in the following dimensions:

22mm, 25mm, 32mm, 38mm, thickness
75mm, 100mm, 125mm, 150mm, 200mm widths

Technical information

LIGNIA Fire Working Properties

  • Moisture movement - 1.22% (average 4) small movement classification 
  • Sustainable and legal - FSC® certified from managed plantations
  • Below limit of quantification - 0.008 ppm emissions of formaldehyde under ASTM D6007 - 14 (HPVA Laboratories) 
  • Durability class 1 - use class UC3B (60 years minimum life against rot and fungal decay in above ground applications) 
  • Durability against termites - AWPA E1-17 test proves highly resistant to subterranean termites. On a rating scale of 0-10 where 10 is not attacked, LIGNIA scored 9.5.
  • Density through modification is increased to an average of 650kg/m³ (41 lbs/ft³)improving mechanical properties 
  • Janka hardness test - increased to 1574 lbf
  • Points of bending - Modulus of elasticity 1,746,840 psi
  • Superior machining finish with minimal sanding required 
  • Supplied with minimal visual defects and good levels of color consistency 
  • pH neutral, so less likely to cause corrosion
  • Stick mark may be present on rough sawn LIGNIA Fire and should disappear once planed 2-3 mm off each face
  • Coatings - when choosing a coating system, it should be confirmed with the paint manufacturer that the coating will not adversely affect the classification. There are a variety of flame-retardant paints which provide the same finish and wear qualities equal to general decorative paints. We recommend an end sealant is used if coatings are applied
  • As with all timbers when left uncoated, LIGNIA Fire, when exposed to the elements and UV, will over time turn to a grey colour. The length of time and degree of surface weathering may be determined by building location and facing elevation
  • No leaching, fire retardancy properties remain for whole of life product 


Lab testing

Tested for resilience and safety

All LIGNIA products are independently tested for quality and durability by leading accreditation bodies worldwide, including the USA, Canada, the UK and Europe.

LIGNIA Fire has also been approved for use in schools in the US, passing the CDPH Emissions Compliance Test. 


Suitable applications

All applications

Suitable applications of LIGNIA Fire


Here are some frequently asked questions. If you can't find what you're looking for then please email us at info@lignia.com

LIGNIA Fire contains formaldehyde, is this safe to use in a house or structure?

Yes, completely. Resin used in our wood modification process does contain formaldehyde, a naturally occurring chemical that is found in all wood.  Our modification process removes this chemical and testing has consistently shown emissions of formaldehyde from our product are at levels considered safe.

Will resin leach out of LIGNIA Fire in service?

No, the LIGNIA Fire modification process polymerises resin locking it into the wood over the lifetime of the product.

Can I cut into it safely?

Yes, LIGNIA Fire can be processed in the same way as any other wood. Once cured, the resin’s composition resembles that of lignin - a naturally occurring wood polymer. As for all wood products, appropriate measures should be used to prevent dust generated by wood machining operations being inhaled or contacting the eyes.

Can LIGNIA Fire processing waste (shavings, sawdust and offcuts) be used for animal bedding?

No, the UK Environment Agency classifies wood treated with resin as GRADE C wood waste along with particleboard, MDF and plywood. As such, it should not be used for the manufacture of animal bedding.

Where pieces are too small to manufacture into product, the best route for disposal is via incineration with energy recovery in a WID compliant incinerator. Biomass is making a significant contribution to the UK’s energy security.

How is LIGNIA Fire made?

Softwood that has been graded to make sure it is of suitable appearance is impregnated with a resin. Wood is next dried, and resin cured at high temperature to lock the resin in place at a molecular level.

How durable is LIGNIA Fire?

Independent laboratory testing has shown LIGNIA Fire to be Very Durable (Class 1 Durability) against decay fungi. Independent testing has also shown improved resistance against termite attack.

Is LIGNIA Fire hard wearing?

Although density of LIGNIA Fire is increased, the Taber resistance test showed it to be less resistant to wear than hardwoods such as oak and beech.

Will LIGNIA Fire change colour over time?

As with other timbers, when exposed uncoated outdoors to the weather LIGNIA Fire will silver over time due to interaction of UV and rainfall with the wood surface. Rate of colour change will depend on level of exposure and will differ with geographic location and elevation.

Can LIGNIA Fire be glued and painted?

LIGNIA Fire can be glued and painted in the same way as other timbers. Guidance on suitable adhesives and coatings and their applications are available on request.

Can LIGNIA Fire be screwed and nailed?

LIGNIA Fire can be screwed and nailed like any other timber. However, since its average density is 650 kg/m3 then to avoid splitting of the wood, for thicker pieces pre-drilling is recommended. Fixings should be at least 20mm from the ends and 15mm from edges of boards respectively to avoid splitting.

How easy is LIGNIA Fire to machine?

LIGNIA Fire saws, planes and sands well to a good finish. Wood working machinery should be set up to as if machining a medium density hardwood such as Iroko.

How stable is LIGNIA Fire?

LIGNIA Fire is classed as a Small Movement timber similar to teak or Western Red Cedar. Small movement timbers are preferred for use externally because fluctuations in environmental conditions result in changes to wood moisture content and shrinkage and swelling of wood. Small Movement timbers shrink and swell less and are more suitable for use in joinery, cladding, decking or outdoor furniture.

Does LIGNIA Fire contain knots?

LIGNIA Fire is manufactured from timber graded to be ‘free’ from knots and other naturally occur blemishes such as resin streaks on the faces of the piece. Our grade means only small knots <5mm diameter and small resin streaks will ever be present at the surface of our LIGNIA products. 

What are emissions from LIGNIA Fire under ambient conditions?

LIGNIA Fire has been tested for formaldehyde emissions using appropriate standards.

Using BS EN 120, LIGNIA Fire was shown to meet the requirements of European Emissions Standards E1 (low emission) classification when tested. Emissions under European E1 Class are 0.1ppm so our samples are at least 12.5 times lower.  

The EPA TSCA Title VI federal regulation emissions limit for formaldehyde is set at 0.05ppm so LIGNIA Fire emissions are at least 6.25 times lower.

Using the JIS 1460A its emission levels were ≤0.3mg/l, the lowest classification available under the test.

Can it be burnt?

Yes, the best route for disposal of LIGNIA Fire waste is incineration in a Waste Incineration Directive (WID) boiler with recovery of energy.

Is dust produced from LIGNIA Fire machining carcinogenetic?

All wood dusts and not just LIGNIA Fire dust are considered hazardous to health since they can cause skin disorders, respiratory problems and nasal cancer. As such, the same precautions need to be taken when processing LIGNIA Fire as for any other wood or wood product.

Can LIGNIA Fire be used for structural applications?

The modification process does not reduce the strength of the wood but since LIGNIA Fire is manufactured from wood graded for appearance rather than strength, then it is not suitable for use in structural applications.

Can LIGNIA Fire be used in sea water?

Performance of LIGNIA Fire in marine applications (i.e. when permanently submerged in seawater) has yet to be tested. In this situation, wood is exposed to abrasive forces resulting from wave action as well as marine borers. 


Is LIGNIA Fire sustainable?

Absolutely! LIGNIA Fire is manufactured from softwood harvested from sustainably-managed plantation forests. All timber used is FSC® Certified. Carbon dioxide sequestered by these trees as they grow remains locked-in the wood over the life of the product. Since LIGNIA Fire products are durable, there is less of a need to replace these, reducing demand for wood to manufacture replacements. Where LIGNIA Fire products cannot be re-used at the end of their service life they are suitable for use as biomass.

What does the 50-year warranty cover?

The warranty covers LIGNIA Fire against wood destroying fungi in Use class 3 as defined in BS EN 335:2013.  This Use class includes situations in which the wood or wood-based product is above ground and exposed to the weather (particularly rain). Typical products which fall under this use class are decking boards, cladding and windows and exterior doors.

Will there be any surface checking or splitting?

LIGNIA Fire is manufactured from wood graded to exclude splits and allow only a small number of checks. Care is taken during the modification process to prevent checking and splitting. Every piece of LIGNIA Fire is graded at the end of the modification process as part of our quality control procedures. The Company provides assurance to its customers about the quality of each piece of LIGNIA Fire through our Selling grade. The Selling grade places limits on splits and surface checking in pieces.

What is the moisture content of LIGNIA Fire?

As with other timbers, the moisture content of LIGNIA Fire will equilibrate to a level that depends on the environmental conditions (i.e. temperature and relative humidity) it is exposed to.

Is LIGNIA Fire acidic?

No, independent testing and regular QC checks on LIGNIA Fire have shown it to be pH neutral or slightly alkaline unlike most timbers that are acidic in nature. As it is not acidic, regular stainless steel or other metal fixings can be screwed into LIGNIA Fire without causing corrosion.

What process do you use to modify your timber?

LIGNIA Fire is manufactured using a patent pending resin modification process. During manufacture, wood is fully impregnated with resin. The wood is then dried, and the resin cured through heating under high temperature and pressure to polymerise the resin and ‘lock it’ into the wood altering its properties throughout the piece.

How should LIGNIA Fire be disposed of?

LIGNIA Fire must be disposed of in accordance with local regulations. This applies to unused material, processing waste (dust, shavings and offcuts) and to end of life material.

Is LIGNIA Fire safe to handle?

LIGNIA Fire can be handled like any other timber. On leaving our production facility, it is completely dry. However, it is rough sawn and for that reason, we recommend that gloves be worn to avoid splinters.

How should I store LIGNIA Fire?

Effort is made to ensure that the quality of LIGNIA Fire leaving our manufacturing plant meets requirements set out in our selling grade. However, in common with other timber products, it is important that LIGNIA Fire be appropriately handled and stored to prevent damage and degrade as it moves along the supply chain. LIGNIA Wood Company recommends that it be protected from direct wetting and packs to be supported off the ground on bearers extending the full width of the pack and at intervals that keep timbers flat to prevent warp. For further guidance, contact us at info@lignia.com

Is LIGNIA Fire combustible?

Understanding combustibility is important to specifiers of construction products including cladding in the EU and siding and decking in the USA.

In the EU (and UK) only construction products in Euroclass A1 can be classed as non-combustible, with those in A2 classed as limited combustibility. All wood and wood-based materials are rated as Euroclass B or lower and therefore classed as Combustible albeit to different degrees.


Where to buy

All distributors

We are the manufacturers of LIGNIA and we sell through established distribution partners around the world who are listed here. If you are in a region or country that isn’t listed here please contact us.