Skip to content

Woodsafe Exterior WFX™

Woodsafe Exterior WFX™ is a unique fire impregnation system for wood products that is based on polymer technology, which means that the fire protection agent hardens and forms a waterproof polymer. The result is that wooden cladding can be exposed in an exterior environment without requiring surface treatment for natural ageing. 

Aging process on nature's terms

Woodsafe Exterior WFX™ fire retardant treatment is available in several different types of wood, including red and yellow Cedar, shingles of Cedar, Thermowood Spruce, -Pine, Ash, Accoya, Nobelwood, Ayous, Frake, Spruce, Core pine, Larch and more. 

Woodsafe Exterior WFX™ fire retardant manufacturing is covered by a type approval certificate according to the Swedish Housing Agency's building regulations, Plan and Building Act (SFS 2010:900) and construction product regulation 305/2011, EN14915 with associated continuous manufacturing control by RISE (0402). Document reference TG0263-08, CPR-0402-SC0260-15.

Woodsafe Exterior WFX™ fire retardant treatment is the only FR-product on the market certified according to EN16755 EXT and ASTM D2898, which is directly decisive for the suitability of installing fire-impregnated wood in an exterior environment without a protective paint layer, making the product an excellent choice for facade cladding to age naturally without maintenance . It is important to know that the English variant BS-EN16755 EXT, which is not approved by the CEN commission, cannot be compared with EN16755EXT. 


Technical characteristics

Technical characteristics

  • Reaction to fire: B-s1,d0. (-s2)
  • Facade cladding: SP-Fire 105
  • Utility class EN16755 INT1, INT2, EXT
  • LR-resistance (Leach resistance, Wood Protection Association, UK) 
  • Approved facade cladding* with Rockwool, Isover, Kooltherm, Finnfoam
  • Approved facade cladding* with KL wood substrate, D substrate, 3-layer board (D), Spruce plywood
  • Meets the requirements for E1 (EN717)

*Contact us for more information

General information

General information

In our impregnation process, the wood and the wood product are wetted in their entirety, and depending on the product, 2-15% by weight of fire retardant is pressed deep into the cell structure of the wood, where it is fixed.

The combination of moisture and drying means that an initially finished planed, sawn or processed wood product can become slightly crooked and warped compared to untreated wood. The better the quality of the wood product, the better the final product.

In the fire impregnation process, the wood is soaked with water mixed with fire impregnation agent, and then dried. The impregnation process also means that dimensional changes depending on the type of wood and plywood can occur, even within the framework of the same quality grading, which can result in the wood material's dimensions changing differently.

Dimensional change may deviate from planing tolerance and plywood tolerance, which is considered ok because the impregnation process takes place after planing and the production of plywood. It is the responsibility of the client/customer to take these conditions into account when ordering Woodsafe's contractor impregnation services through partners.

Woodsafe Exterior WFX™

The market's No. 1 fire retardant impregnation for exterior "Durable Fire Protection" natural aging

Sample projects Woodsafe Exterior WFX™



FAQ Woodsafe Exterior WFX™

Is Woodsafe Exterior WFX™ organic fire protection?

Is Woodsafe Exterior WFX™ toxic?

Can Woodsafe Exterior WFX™ be used indoors?

Can Woodsafe Exterior WFX™ be surface treated?

Does Woodsafe Exterior WFX™ contain substances included in the REACH CLP list?

Can I treat with silicon such as Organowood, Sioox, iron vitriol?

Can fire retardants based on iron phosphate, di-ammonium, ammonium phosphate be compared to WFX's maintenance-free properties?

Is Woodsafe Exterior WFX™ type-approved?

Is Woodsafe Exterior WFX™ CE certified?

Can I buy the product directly from you?

Does Woodsafe Exterior WFX™ have fire resistant properties?

DoesWoodsafe Exterior WFX™ contain hygroscopic substances such as ammonium phosphate?

What sets Woodsafe Exterior WFX™ apart from other fire retardants?

Some operators claim that their product is maintenance-free because the type of wood is impregnated, is that correct?