The main species in the Nordic countries is Scots pine due to the suitability for preservative treatment. Preservative treatments make it possible to use scots pine in outdoor applications which ensures local jobs and short transportation. Other species are also used such as Norway spruce. But since Norway spruce is not permeable a special treatment and classification is included in the NTR system.
Durability of NTR marked wood
The NTR system ensures a long service life.
Above ground durability is prolonged dramatically – up to 50 years’. In ground contact the service life is improved up to 10 times compared to untreated wood.
NTR requires field trials for performance documentation which is unique in Europe and ensures that any new product meets the expectations.
The environmental impact of treated wood is highly regulated. The production sites are controlled and environmentally approved by the authorities (work and external environment). Furthermore, the biocides are approved by ECHA (European Chemicals Agency) who administrates biocides at the European level according to the BPR (Biocidal Products Regulatory). The preservative product is approved at national level based on efficacy and environmental data. All NTR products are approved according to BPR.
The timber used for NTR treament is from sustainable forest (PEFC or FSC). This ensures that forest is cultivated in a environmental respectful way. Since wood is a renewable material and is absorbing CO2 when growing – wood is a sustainable choice contributing to the SDG (Sustainable Development Goals) 12 (responsible production and use) and 13 (climate effort). Wood treatment prolongs the service life of wood products, which in turn leads to less use of resources and keeps the carbon storing wood products in their material form for as long as possible.
Treatment is typically done in a closed pressure vessel where the preservative is penetrating the wood structure (sapwood). NTR controls the production site twice a year which is unique in Europe and in the world.