Tenders
Wooden constructions involving KVH®, Duobalken® and Triobalken®
The German contract procedures for building works (VOB/A, Section 9) stipulate the following: "The work required must be described clearly and in sufficient detail to ensure that all bidders understand the description to have the same meaning and to enable them to calculate their prices with certainty and without extensive preparatory work." You can only be certain of obtaining the correct product if the wording in your tender documents is clear, complete and correct in technical terms. Given the high standard of quality to be met by KVH®, Duobalken® and Triobalken®, careful quality controls are required during production. It is therefore in your own interests for you to ensure that the timber you are supplied with comes from quality supervised production sources. For an up-to-date list of supervised firms, please see www.kvh.eu. in the internet.
Principles of standards (the latest versions of each standard of relevance for tenders)
|
ATV DIN 18334 |
18334 German VOB contract procedures for building works - Part C: General technical specifications for building works for carpentry and timber construction works (VOB Vergabe- und Vertragsordnung für Bauleistungen - Teil C: Allgemeine Technische Vertragsbedingungen für Bauleistungen (ATV) - Zimmer- und Holzbauarbeiten) |
|
DIN 1052 |
Design of timber structures - General rules and rules for buildings (Entwurf, Berechnung und
Bemessung von Holzbauwerken - Allgemeine Bemessungsregeln und Bemessungsregeln für
den Hochbau) |
|
DIN 4074-1 |
Strength grading of wood - Part 1: Sawn coniferous timber (Sortierung von Holz nach der
Tragfähigkeit - Teil 1: Nadelschnittholz) |
|
DIN 68800-2 |
Wood preservation - Part 2: Preventive constructional measures in buildings (Holzschutz - Teil 2: Vorbeugende bauliche Maßnahmen im Hochbau) |
|
DIN 68800-3 |
Wood preservation - Part 3: Preventive protection of wood with wood preservatives (Holzschutz - Teil 3: Holzschutz; Vorbeugender chemischer Holzschutz) |
Tender wording for the supply of construction timber made of KVH® structural timber
Item ... ... m³ Supply of KVH® Si structural timber, S10/C24
KVH® Si (for exposed areas) structural timber compliant with DIN 4074-1 S10TS (strength class C24 in accordance with DIN 1052). Moisture content: um = 15 ± 3%. Type of cutting: Split-heart. Surface: Planed and chamfered. Dimensional stability class 2 in accordance with EN 336, from a quality supervised production source.
Item ... ... m³ Supply of KVH® NSi structural timber, S10/C24
KVH® NSi (for non-exposed areas) structural timber compliant with DIN 4074-1 S10TS (strength class C24 in accordance with DIN 1052). Moisture content: um = 15 ± 3%.
Type of cutting: Split-heart. Surface: Leveled and chamfered. Dimensional stability class 2 in accordance with EN 336, from a quality supervised production source.
Tender wording for the supply of laminated beams
Item ... ... m³ Supply of Duobalken® Si laminated beams, S10/C24
Duobalken® Si (for exposed areas) laminated beams, made of two planks which are glued together, compliant with DIN 4074-1 S10TS (strength class C24 in accordance with DIN 1052). Moisture content: um = max. 15 ± 3%. Surface: Planed and chamfered. Dimensional stability class 2 in accordance with EN 336, from a quality supervised production source, in accordance with approval number Z-9.1-440.
Item ... ... m³ Supply of Triobalken® Si laminated beams, S10/C24
Triobalken® Si (for exposed areas) laminated beams, made of three planks which are glued together, compliant with DIN 4074-1 S10TS (strength class C24 in accordance with DIN 1052). Moisture content: um = max. 15 ± 3%. Surface: Planed and chamfered. Dimensional stability class 2 in accordance with EN 336, from a quality supervised production source, in accordance with approval number Z-9.1-440.
Note: Duobalken® and Triobalken® beams can also be supplied for non-exposed areas, in which case the surface is planed and leveled.
Special requirements
| Wood species | KVH® structural timber and Duobalken® and Triobalken® beams are made of spruce/fir as standard. However, they can also be supplied in pine, larch and Douglas fir as well on request. Where it is intended that the products be used within the terms of Use Class 2 as defined by DIN 68800-3 (temporary humidification, e.g. in protected outside areas) and no preservative treatment is to be used, the tender document must specify sapwood-free dark-colored heartwood of larch or Douglas fir. |
| S13TS/C30 |
KVH® structural timber and Duobalken® and Triobalken® beams are also available, on request, in |
