Reaction to fire class D-s3,d1

Solution > Fire retardant treatment

Reaction to fire class D-s3,d1

To comply with fire reaction class D-s3,d1, it depends on the wood product you choose which conditions you need to meet. The new fire regulations (20 August 2024) distinguish between 'treated' wood and 'untreated' wood.

Untreated wood = Wood that has not been preserved through impregnation, has not been thermally or chemically modified, and/or has not received any surface treatment such as oil, paint, or varnish, etc.

Treated wood= Wood that has been preserved through impregnation, thermally or chemically modified, and/or received a surface treatment such as oil, paint, or varnish, etc.

According to the new rules of August 20, 2024, the 'treated wood' must be tested to determine if the facade construction meets the required reaction to fire class. You can no longer simply rely on the CWFT table when choosing 'treated' wood products.

You can avoid these tests by treating the wood with a fire retardant.

We offer a wide range of CE certified products. Our fire-retardant treatment impregnates the wood under vacuum pressure with the fire retardant Burnblock^® and thus meets B-s1,d0 (better than D-s3,d1). The fire-retardant treatment can also be combined with a pre-weathering or color as a surface treatment.

The fire retardant treatment takes place at the same production site.

Good news for LDCwood^® ThermoWood^®

LDCwood^®ThermoWood^® needs no fire retardant treatment or tests if you comply with the below requirements:*

*Tests and classification report WFRGent nr. 19763G.

Using LDCwood® ThermoWood® without fire retardant treatment or tests

1. Substrate

Wood-based panels (class D-s2,d0 or better, minimum thickness of 10 mm, minimum density of 510 kg/m³) or
Non-combustible panels (class A2-s1,d0 or better, minimum thickness of 10 mm, minimum density of 510 kg/m³)

2. Moisture barrier

3. Ventilated air cavity with a min. thickness of 38 mm + attachment system (e.g. spruce or pine with a min. density of 450 kg/m3).

4. Closed facade cladding, placed horizontally or vertically:

Using a flat profile: min. thickness of 18 mm is required
In ThermoWood^®* spruce, pine, fraké, ash, red oak or radiata pine.

Any deviation from the above wood species and conditions must be tested.

A rain screen (<1 mm) has no significant impact on the reaction to fire class of closed cladding.

* without coating (oil, varnish, paint, ...)

Do you prefer coated LDCwood^® ThermoWood^®?

Normally, in accordance with the new regulations, coated LDCwood^® ThermoWood^® (pre-greyed, varnish, oil, paint, ...) must be tested.

However, our CE-certified fire-retardant products do not need to be tested. We have the necessary classification reports for this purpose.

Discover our wide range of CE certified fire retardant ThermoWood^®.

Lemahieu Fire Protection's fire-retardant treatment impregnates the wood under vacuum pressure with the fire retardant Burnblock^® and thus meets B-s1,d0 (better than D-s3,d1).

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