Skip to content

Durability of Fire Performance

Let us first explain. Fire rating is one thing, but the fire retardant's ability to last over time is completely different. The fire rating of the wood product is not dependent on the durability properties at the time of testing to verify the fire rating. However, the fire class is dependent on fulfilment of the requirement criteria according to EN16755 EXT to ensure functionality over time and in the event of external damp exposure.

Several factors play a role in the long-term function against fire, such as whether the fire protection agent's substances are hygroscopic or not, whether the fire protection agent is approved for exposure in an exterior environment without or with (must) cover painting. At the time of writing, there is no fire-retardant treated wood product approved with long-term resistant properties without surface treatment based on ammonium, di-ammonium, poly-ammonium, iron (III) phosphate, borates. All off this system must be top coated with documented properties according to EN16755 EXT.


Type-approved properties & quality system

Type approval certificate is an approval certificate that the product's properties meet national building regulations which also include third-party review of quality management systems and continuous manufacturing control

The type approval certificate for Woodsafe Timber Protection AB is an approval according to ch. 1 and 8. §§ 22 and 23 of the Planning and Building Act (SFS 2010:900) and § 4 § 2 and 3 PBL and the Swedish Housing Agency's building regulations (BBR) 2:2, 5:231, 5:551, -points 2, 3, 4 and 6: 21 which includes use class according to EN16755 INT1, INT2 and EXT.



WOODSAFE® Exterior WFX™ and WOODSAFE® PRO™ has type approved properties verified by RISE (No.Body, reference TG0263-08) and covers to all wood species for natural ageing and spruce (PRO) with a covering layer of facade paint according to the type approval certificate.

FR_Benchmark_Treater (Woodsafe)

Woodsafe Timber Protection AB is WPA certified

The roots of the Wood Protection Association go back to 1934 with the formation of the British Wood Preserving Association. With the industry knowledge and experience gathered by the WPA, the WPA is the UK's leading body on all matters relating to wood protection and has a respected voice with many UK and European standard setters. WOODSAFE® PRO is WPA certified and listed as HR (humidity resistance) and WOODSAFE® Exterior WFX is WPA certified and listed as LR (leach resistance).

Proven and versatile fire protection for both exterior and interior environments. In an exterior environment, the wooden product is traditionally painted according to instructions, and when used internally, there are several options for creative color replacement. 

Worldwide unique fire protection optimized and approved for damp and exterior environments without requirements for protective surface layers, e.g. facade color. 

Tip: "Hope you are well aware that fire class is one thing while utility class is quite another. Choosing a fire protection system means that you must be aware of both conditions".

We know what leaching looks like. Do you?

For an untrained eye, it is not easy to see leaching of fire retardants and connect other defects to leaching, for example mold growth indoors in spaces with a high relative humidity ratio or insufficient ventilation and cold bridges. Leaching can manifest itself in many ways, but also through mold growth due to nutrient supply via the fire retardant. This is a relatively common problem in interior environments with thermal bridges, temperature differences and insufficient ventilation. In a stressful exterior environment, it is not possible to use ammonium-based and similar fire protection systems, as this type of formula is hygroscopic and unprotected leads to leaching.

WOODSAFE® has type-approved properties for various applications and we have a trained eye on how this occurs and we know why it is so important to ensure properties according to EN16755 INT1, INT2 and EXT. If you feel unsure, why take a chance?