Should your Oak beams require a structural grading certification in accordance with British Standard BS:5756 (2007) then our graders are full trained to visually grade applicable temperature hardwoods in accordance to the current standard.
It must be noted that there are section limitations on each strength class which are strictly adhered to.
|Oak||TH1 & THB||THA|
TH1 & TH2 This strength class is available for temperate hardwoods, however the thickness must be less than 100mm and the cross-section must be less than 2,000m2
THA & THB – This strength class is available for temperate hardwoods with a thickness greater than 100mm and a cross-section greater than 20,000m2
***Please note – TH1 is a higher grade than TH2, likewise THA is a higher grade than THB.