Certifications



Finger-jointed construction timber

Finger jointing is mainly used in construction timber to produce longer lengths also Finger Jointing can be used in CLS to produce material that remains straighter and does not move insitu.

Finger-jointed timber is mainly machine graded which allows the timber to be used in a load-bearing structuresand is generally stronger than solid material as the defects have been removed during processing.

Mechanical strength grading identifies a physical property that is associated with strength, such as the static or dynamic modulus of elasticity. Some machines combine judgements on multiple properties, such as density, modulus of elasticity or inner structure, using x-rays. The most common mechanical principle in use today involves determining the modulus of elasticity by measuring the resonance frequency from a tap on the end of the wood.

Mechanical grading follows the standard SS-EN 14081-1, which also gives detailed labelling rules. Strength graded construction timber must be CE marked in line with SS-EN 14081-1.

Type of grade stamp on the face of finger jointed timber.

CE MARKING
Producer identification Marking year Derome
EN 14081-1
Structural timber	FJ   (finger Jointed)
Strength class	C24
Species code	Spruce (PCAB)
Grading standard	EN 338
Reaction to fire	D-s2, d0
Durability class	4

 

 Keith Wyatt AIMMM, UKTGC, TTF Arbitrator

 

DOP for the Ignifugo FR Class B MDF