KVH® - the standard in modern wood construction. Technically dried WMC 15%, standardised and quality-monitored.
KVH® solid structural timber
TRADITION FOR CRAFTSMANSHIP AND INDUSTRY
At the Hirschberg site, we produce KVH®1plus®, a high-quality solid wood product for timber construction. As well as creating products for sustainable use, we strive to develop products from our valuable raw material that meet the highest quality requirements. This approach results from the values that form the basis of our self-perception and our working principles and that reflect the needs of our customers: high quality, innovative and sustainable!
List by dimension made of KVH®-1plus
We would also be happy to produce KVH® for you according to the list without any length waste. Many lengths, packages and custom dimensions are also possible! Produced according to your requirements, labelled and delivered by us - for further processing exactly as you wish.
Please contact us for more information!
List by dimension
rettenmeier® is your professional partner for quality products in the fields of specialist trade, wood construction and roofing. The benefits for our market partners range from comprehensive advice and information on all legal and product-related issues about creating ideal solutions through to the professional follow-up by our after-sales service.
|Sorting feature||Requirements for SELECT||Requirements for NSi||Comments|
|Sorting class in accordance with DIN 4074-1||At least S 10 TS or 10K TS, C 24 in accordance with DIN EN 338||At least S 10 TS or 10K TS, C 24 in accordance with DIN EN 338||The code K stands for a board or plank sorted as squared timber.|
|Wood moisture content||15 % ± 3 %||15 % ± 3 %||The specified wood moisture content is a prerequisite for a far-reaching waiving of preventive wood protection.|
|Cut type||heartwood-separated||heartwood-separated||Since the pith does not necessarily run through the centre of a tree, "heartwood-separated" is defined as follows: for a tree with an ideal growth form, the pith would be cut through in two-strand cutting.|
|Wane||Not permitted||≤ 10% of the side with the smaller cross-section||Wane measured diagonally|
|Dimensional accuracy of the cross-section||DIN EN 336 dimensional accuracy class 2 b ≤ 100 mm ± 1 mm, b ≥ 100 mm ± 1.5 mm||DIN EN 336 dimensional accuracy class 2 b ≤ 100 mm ± 1 mm, b ≥ 100 mm ± 1.5 mm||The dimensional accuracy for the length dimension must be agreed between the purchaser and the supplier|
|Branch condition||DIN 4074-1 sorting class S 10||DIN 4074-1 sorting class S 10|
|Knottiness||S 10: A ≤ 2/5 not over 70 mm||In the event of automatic sorting, the branch sizes are not taken into account; otherwise, the following applies: S 10: A ≤ 2/5||Knottiness A is determined according to DIN 4074-1|
|Bark inclusion||Not permitted||DIN 4074-1|
|Cracks, radial shrinkage cracks (dry cracks)||Crack width of b ≤ 3% of the respective cross-section width||DIN 4074-1||With SELECT, increased requirements compared with sorting class S 10 in accordance with DIN 4074-1|
|Resin pockets||Width b ≤ 5 mm||-||Additional criterion|
|Discolourations||Not permitted||DIN 4074-1||With SELECT, increased requirements compared with sorting class S 10 in accordance with DIN 4074-1|
|Insect infestation||not permitted||DIN 4074-1||With SELECT, increased requirements compared with sorting class S 10 in accordance with DIN 4074-1|
|Distortion||-||-||The permitted level of distortion is not defined further, as – given compliance with all other criteria – no intolerable distortion is to be expected.|
|Longitudinal curvature||With heart-separated cut ≤ 8 mm/2 m||With heart-separated cut ≤ 8 mm/2 m|
|Processing of the ends||Capped at right angles||Capped at right angles|
|Surface quality||Planed and chamfered||Equalised and chamfered|
|Finger joint||DIN EN 15497|
|Dimensional changes/differential swelling and shrinkage if the wood moisture changes by 1% each||0,24 %|
|Swelling and shrinkage isotropy ratio tangential to radial||2|
|Bulk density ρ (at approx. 15% wood moisture content) on average||450 - 480 kg/m³|
|Water vapour diffusion resistance coefficient µ (DIN 4108)||40|
|Thermal conductivity λR (DIN 4108)||0,13 W / (m*K)|
|Dimensional and form stability||Good|
|Building material class (DIN EN 13501-1)||D-s2, d0|
|Building material class (DIN 4102)||B2 (normally flammable)|
|Burning rate on average||0,65 – 0,70 mm/min.|
|Not finger-jointed KVH®-1plus®||DIN EN 14081-1 with DIN 20000-5||CE mark|
|Finger-jointed KVH®-1plus®||DIN EN 15497 with DIN 20000-7||CE mark|
|QLH®-Duo/Trio-plus®||Laminated timber and laminated beam timber are produced in accordance with DIN EN 14080 with DIN 20000-3 + DIN EN 15497 with DIN 20000-7||CE mark|
The service life of wooden components used outdoors can be significantly increased if the issue of wood preservation is considered at the design stage. Otherwise, a component's useful life may be greatly affected by local conditions (high level of ambient moisture, permanent or occasional contact with water, lack of rear ventilation, etc.). On the other hand, favourable installation conditions can also considerably increase service life by, for example, preventing contact with soil or providing cover.
|UC||WMC/exposure||General conditions for use||Insects||Fungus||Wood rot||Wood pests in the sea||Leaching procedure||Durability class required|
|Dry (constantly <20%) mean relative air humidity up to 85%||Wood or wood product under roof, not exposed to weathering or moisture. Insect hazard can be excluded in accordance with 5.2.1.||No||No||No||No||No||1 - 5|
|1||Dry (constantly <20%) mean relative air humidity up to 85%||Wood or wood product under roof, not exposed to weathering or moisture.||Yes||No||No||No||No||1 - 4|
|2||Occasionally moist >20% mean relative air humidity > 85%. Or temporary humidification due to condensate.||Wood or wood product under roof, not exposed to weathering, a high ambient humidity can lead to occasional, but not permanent moistening.||Yes||Yes||No||No||No||1 - 3|
|3.1||Occasionally > 20% moisture content||Wood or wood product not under roof, with weathering, but with no permanent contact with the ground or water. Accumulation of water in the wood not to be expected, even within spatially limited areas.||Yes||Yes||No||No||Yes||1 - 3|
|3.2||Frequently > 20% moisture content||Wood or wood product not under roof, with weathering, but with no constant contact with ground or water, accumulation of water in the wood to be expected, including in spatially limited areas.||Yes||Yes||No||No||Yes||1; 2|
Besides the individual species of wood selected and its natural durability, the service life of timber can be significantly influenced by structural timber protection.
If wood is exposed to high levels of moisture for lengthy periods, it will be damaged by fungal decay. This can be prevented by the proper planning of structural measures to protect the wood at the execution stage.
Where possible, upright, load-bearing timber components should never come into direct contact with the ground in external areas. To protect them from splashing, it is advisable to maintain a minimum gap of approx. 15 cm (mounting on supports).
Horizontal wooden structures should likewise avoid any direct contact with the ground and be kept a sufficient distance from the subsoil. To prevent water from collecting, horizontal areas should always have a slight gradient.