​WISA-SpruceFR is a fire-retardant plywood product for use in construction. The fire retardant treatment significantly improves fire resistance properties of the product without compromising the plywood panel’s excellent technical performance. WISA-SpruceFR works equally as well as the base product – WISA-Spruce – in all kind of construction, especially in structural uses and load bearing structures.


  • Fire-retardart
  • Highest fire classification a wood based panel can get
  • Sustainable
  • Lightweight


Construction, especially strucural uses and load bearing structures
Temporary building.


Weather resistant gluing according to EN 314-2/class 3 Exterior. WISA-Spruce fulfils the requirements of EN 13986 E1 low formaldehyde emission class.

Surface and edges

Face veneer grades II and III (comply with standard EN 635-3). 
Additional grade G (improved/solid grade II). 
Fire retardant treatment is applied on both surfaces.

Panel size

Length from 2400 to 2500 mm
Width from 1200 to 1250 mm

Fire classification

According to standard EN 13501-1:
B-s1, d0 (roof and wall structures)
Bfl-s1 (floors)


T & G on request

Thicknesses and weights

​Nominal thickness (mm) ​ ​Number of plies ​ Thickness (mm) ​Weight kg/m2 ​
    min. - max.  
​15 ​5 14.3 - 15.3 ​6.8
​18 ​7 17.1 - 18.1 ​8.6

Sizes and thicknesses relating to moisture content 8 - 10 %.
Thicknesses and tolerances fulfil EN 315 requirements.