Woodsafe FirePRO™

Woodsafe fire protection treatment standard for exterior and interior applications. Solid wood and plywood materials treated with Woodsafe FirePRO™ can be finished using several different systems, e.g. lacquer, stain and topcoat, without losing performance standards such as B-s1,d0. Woodsafe FirePRO™ can be used advantageously as a wood facade in multi-storey buildings, balconies, walls and ceilings indoors, designs, applications for acoustics (e.g. furring, perforated plywood, packaging, offshore environments, vehicles such as trains and trucks, etc.). Woodsafe FirePRO™ is featured on by the UK Wood Protection Association (WPA) as "humidity resistance (HR)", which means that the product is resistant without leaching defects. Woodsafe FirePRO™ is DOP declared and CE certified under EN14915:2013, EN13986:2004 for most species of wood and plywood, such as pine, spruce, oak, larch, cedar, birch, ash and others, and plywood such as birch, pine, spruce and poplar. The certification of Woodsafe FirePRO™ includes over 31 variations and over 130 variations of wood species, fire classes, treatment and processing.



Woodsafe FirePRO™ is composed of non-hygroscopic substances and does not contain substances such as ammonium, urea, di-ammonium, monoammonium and suchlike. Woodsafe FirePRO™ is covered by type approval as a non-hygroscopic product through a durability test with the fire characteristic CEN/TS 15912:2012 DRF INT, INT1, EXT.

Personal protection  

In accordance with AMV recommendations, please use goggles, gloves and respirators for situations that require them, and provide good ventilation when grinding or generating dust. In cases of acute emergency, contact a doctor by calling 112. In cases of eye injury, rinse gently with warm water from a drinking glass or special water rinsing container until the pain disappears. If irritation persists, contact a doctor by calling 112 and bring the safety data sheet for the product.

Mounting Materials 

When fastening materials are completely covered by paint, quality according to industry standards is recommended. When fastening materials are not covered by paint, the same quality of fixing materials such as nails, screws, nail plates etc. as for Woodsafe Exterior® Fire-X™ are recommended.  

 International Building Code (IBC) Section 2304.9.5.3. Mounting materials for treated wood used outdoors or in wet or damp places. Mountings, including nuts and washers, for fire-treated wood used outdoors or in wet and damp locations should be stainless steel nails of at least A2 quality. At sea, or in other such locations, at least A4 quality applies. 

 Woodsafe Timber Protection recommends the following for outside, moist and weather exposed mounting of Woodsafe Exterior FirePRO™; Always use stainless steel (A2 or A4) in the attachment materials (fasteners for wood materials). This recommendation is particularly important for wood species such as cedar, oak, thermo wood and woods containing tannin, the acidity of the wood, etc.  

Building waste

Woodsafe FirePRO™ construction waste is to be sorted as combustible timber. Burning using your own solid-fuel combustion equipment is not recommended due to deteriorated combustion characteristics, which can damage the equipment. Woodsafe FirePRO products such as sawdust, cutter chips and materials should not be used as animal bedding or for the production of solid fuels such as briquettes, pellets, chips or similar.

Contact with concrete 

Wood that is fire-treated with Woodsafe FirePRO™ can be used in contact with concrete or masonry that will not become wet or damp during use. For example, thresholds, window blocking, lining boards and cap blocking on concrete or masonry exterior walls are all acceptable applications as long as they are enclosed in the building shell and are not exposed to moisture or water. Woodsafe FirePRO™ can be used in contact with dry concrete. Wood treated with Woodsafe FirePRO™ may not be used in contact with wet concrete or concrete that can be exposed to moisture, run-off or flooding.

Surface treatment of wood panels/plywood for interior use 

Woodsafe FirePRO™ can be finished for interior use with lasting properties against fire such as B-s1,d0 according to certification. Approved coating systems certified SC0243-09 include aqueous topcoats, varnishes and pigmented clear coats as well as solvent-based topcoats, varnishes and two-component acid varnish and hardwax. Treating the surface of wood panelling for interior use is recommended in order to retain the wood's colour shade for longer and to protect the wood against pollutants, but is not a requirement.


Woodsafe FirePRO™ has certified resistant properties for exterior application under CEN/TS 15912 DRF1, DRF2, EXT with painted surfaces, Engvall & Claesson brand and others. Details about colour schemes can be requested via support(@)woodsafe.se.


Woodsafe FirePRO™ can be cut to length and for piercing for harnesses, fibre grinding, etc. However, the dimensions of the material may not adjusted to the extent that the amount of flame retardant is reduced significantly. Please consult Woodsafe support for more information.

Natural content of substances in treated wood materials 

Some woods have greater or smaller amounts of minerals, resins, lignin, and acid, e.g. tannic acid in oak. Such substances can react under certain conditions in the treatment process where, for instance tannic acid may discolour oak, e.g. with black, blue-black or blue discolouration, and during the drying process, a rash of resin and lignin may occur. This phenomenon can often be polished away, but it is a natural property that is not subject to warranty. The quality of the supplied raw material is of great importance for optimal results. More information can be found in Woodsafe16 Appendix FRW.

Surface treatment 

Wood materials treated with Woodsafe FirePRO™ must be surface treated for exterior assembly, unlike Woodsafe Exterior® Fire-X™, which does not need to be surface treated. The coating system used must provide industrial high quality, contact support@woodsafe.se for more information. Painting must always be performed in accordance with the principle of a base, intermediate and finishing coat, with sufficient drying time and the thickness for each layer. For instructions please refer to separate painting instructions.

Non-recommended surface treatment systems    

Treatment systems such as iron sulphates and silicon treatment have a low effect on Woodsafe FirePRO™ -treated wood, and therefore do not provide the same quick grey tinting effect as untreated wood. Other systems that are not recommended include earth paint, which does not provide adequate weatherproofing. Contact support@woodsafe.se for more information or call +46 21 147273.

Roof ventilation

Roof ventilation with a natural free flow of air is highly desirable for all kinds wooden ceilings, treated or untreated, because it allows moisture to be discharged whenever the roof is heated by solar radiation, whatever the season. This is due to the "chimney effect" in which air rises naturally when heated. In a sloping roof with eaves ventilation and ridge ventilation, the natural circulation of air removes moisture very effectively. Heated air escapes at the ridge (along with water vapour evaporated from the wood) and simultaneously fresh air is drawn in at the joists.   

The fresh air is heated while rising inside the attic, which reduces its relative humidity and increases its capacity to absorb water vapour. The flow largely stops at night and during cloudy, humid weather because of the lack of solar heat, which means that moist outdoor air is not drawn in at these times. 

 Moisture accumulates in the roof as a result of activities occurring within the living space, such as cooking and showering. The airborne water vapour moves up into the attic through many small "air leakages" at penetrations and at the corners between the walls and ceiling, making it possible for air and airborne moisture to flow upwards to the attic. The moisture often condenses on the cold roof surfaces, which increases the level of moisture in the wood and sometimes causes water to drip onto the insulation. Moisture barriers can reduce the spread of moisture in the attic, but air leakage can carry as much as up to 10 times more moisture into the attic than spreading through the drywall or other material. As a moisture barriers only stop about 10% of the flow of moisture into the roof space, it does not seem logical to halve the minimum free ventilated space required (from 1/150 to 1/300) just because moisture barriers are used. 

 Ventilation fans are a dubious solution. Most are temperature-activated, which means that they do not work in the winter when moisture accumulates fastest. They are not a substitute for natural ventilation. Gable vents does not help much either, because no airflow is created if the wind is not blowing exactly right. There are no simple answers to the question of how much ventilation is needed in a ceiling. What one can say with certainty is that ventilation should be evenly distributed between the ridge ventilation valves and the valves in the joist system, for both untreated and treated plywood. Hipped roofs, flat roofs and pent roofs are difficult to ventilate properly as their shape prevents effective natural ventilation. Each type must be analyzed individually to ensure good moisture control.

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