Solid structure wood | Services

Solid structure wood: the high-tech timber KVH®

Solid structure wood, also known as KVH®, is a special kind of timber which is dimensionally accurate and dimensionally stable due to technical wood drying. This means that only tiny changes of size and shape are to be expected when the wood is installed. Solid structure wood offers some benefits:

Statically determinable material due to quality sorting to DIN 4074 S 10.
Equally good quality from quality-controlled production.
Homogeneous wood appearance due to the utilization of solid wood.
No chemical wood protection of dry installed wood required.
Wood as building material permanently binds carbon dioxide (CO2).

Our results regarding solid structure wood

Merkle Holz offers a complete package:

Standard stock KVH® nSi in 5 and 13 metres available any time.
Up to 18 metres length available.
Large raw material yard; more than 80 different dimensions always available in a dry state.
Douglas-fir KVH® in 20 dimensions always on stock.
KVH® produced by list.
High-quality KVH® Si from preplanned and assorted raw material.
Machined structures ready for installation.
Swift and reliable delivery.
Special requests such as impregnation, millimetre severing or profil planing.

Requirements: Quality criteria of KVH®

Sorting feature	Requirements on
Sorting feature	KVH^®-Si visual quality	KVH^®-NSi industrial quality
Sorting class	DIN 4074-1 sorting class C 24
Product standard	DIN EN 14081-1 for non finger jointed KVH® DIN EN 15497 for finger jointed KVH®
Timber moisture	15% ± 3%
Cut type	heart-separated
Tree edge	not permitted	measured across < 10% of the smaller cross-section side
Dimensional accuracy of the cross section	DIN EN 336, dimension tolerance class 2 ≤ 10 cm ± 1.0 mm, > 10 cm ± 1.5 mm
Knot state	Loose knots and fallen knots not permitted. Individual knocked-out knots or parts of knots up to max. 20 mm Ø are permitted.	DIN 4074-1 Sorting class S 10
Knot contents	A ≤ 2/5, not over 70 mm
Bark pockets	not permitted	DIN 4074-1
Cracks, radial shrinkage cracks (drying cracks)	Crack width b ≤ 3% of the related cross-section width, max. 6 mm	DIN 4074-1
Resin galls	Width b ≤ 5 mm
Discolouration	not permitted	DIN 4074-1
Insect attack	not permitted	DIN 4071-1
Longitudinal warping / Twisting	= 8 mm / 2 m
Processing the ends	Cut at right angle
Surface condition	planed and chamfered	Levelled and chamfered