Good wood or better?

The tree does not show, which career his wood will make.
The final use is not clear until manufacturing. Two different types of full-wood products are possible:

• sawn timber
• refined timber

Refined timber – as KVH® solid structural timber, Duo-/Trio-beams and Glued laminated timber - is mainly used for load-bearing constructions and timber frame buildings. That means all applications which have highest demands on dimensional stability and aesthetic.

Goal of refining is to minimise the risk of checking.
This is done by:

• well-directed choice of incision (free of heart)
• kiln drying to a wood moisture of 12 to 18 %
• grading of wood by strength, growth, knots, resin galls, discolouration, etc.
  
  

	visible quality	not visible quality
Use	Visible wall, ceiling and roof constructions, timber frame buildings, structural compo-nents and prefabricated houses	Not visible wall, ceiling and roof constructions, prefabricated house construction, timber frame buildings, hall con-structions
Wood quality	selected regional and Nordic raw timber	regional raw timber
Surface quality	4-sides planed 4-edges eased	4-sides planed 4-edges eased
Glued laminated timber	BS 11 (DIN 4074/S10) strengths as per DIN 1052-1/A140mm layersin principle free from discolorations and foxy tight knots or replaced knots allowed	BS 11 (DIN 4074/S10) strengths as per DIN 1052-1/A140mm layersdiscolorations, foxy, some light insect attack based on DIN 4074 allowed, no additional maintenance
DUO-/TRIO-beams	based on DIN 4074/S10in principle free from blue stain and foxy,tight knots or replaced knots allowed	discolorations, foxy, some light insect attack based on DIN 4074 allowed, no additional maintenance
KVH	only on request	As per agreement between the Vereinigung Deutscher Sägewerker (VDS) and Bund Deutscher Zimmermeister (BDZ)