Although inflammable, wood endures stronger fire than steel or concrete. A thin carbonated layer is created on the surface of burning wood thus preventing influx of oxygen and the dispersion of fire.
Technically dry wood (10% moisture) poorly transmits heat and thus resists fire longer. Burning, laminated wood retains its primary shape so the bearers cause no additional pressure to frame walls that remain stable.
The insulated solid wood wall 22.5 cm thick is fire proof for as long as 65 minutes. The testing of RIKO outer wall resilience was undertaken at the Slovene Institute for Civil Engineering- Department of construction physics / Fire Laboratory.