The NS mark is the industry's quality label and complies with the Planning and Building Law in Norway.
It is Norwegian Strength Grading Inspection Scheme which are behind the marking - an instance led by a council consisting of the Norwegian Building Standards Council, the Association of Consulting Engineers and a representative from the production companies.
NS and T-marked wood gives safety for all users. For the authorized suppliers it is a trademark that means safe, quality materials with documentation.
Regular checks are carried out, both in the form of unannounced visits and by approval of the technical facilities. All members of Norwegian Strength Grading Inspection Scheme receive inspection visits twice a year.