Foreword to VOB Supplement 2015

VOB Standards need to be continually updated, whether this is due to changes in regulations or to technological developments. The former primarily impact on Parts A and B of the VOB, while the latter affect the standards in Part C, the general technical specifications in construction contracts. Since the publication of the 2012 edition of the VOB, numerous standards in Part C have been revised.

These are contained in the Supplement 2015 to the 2012 edition of the VOB. The revisions involve standards dealing with aspects both under and over the ground. A total of 26 standards have undergone technical revision, 14 have been editorially revised, and a new standard, DIN 18324 “Horizontal directional drilling work”, included.

One of the main changes in the standards dealing with civil engineering aspects is the switch from soil and rock classes to homogeneous zones. This work was completed in 2015. It had already begun in VOB 2012, when homogeneous zones were featured in DIN 18304 "Piling" and DIN 18313 "Diaphragm walling". The changeover from soil and rock classes to homogeneous zones has now been completed for all relevant standards dealing with civil engineering work, making their publication possible.

Many of the standards dealing with building have also been technically revised. As it is in the interest of all users to make these available as soon as possible, the Board of Management of the Deutscher Vergabe- und Vertragsausschuss für Bauleistungen (DVA) decided to issue a Supplement to VOB 2012 before publishing a new full edition. The new full edition is currently in the course of preparation. The provisions of DIRECTIVE 2014/24/EU OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 26 February 2014 on public procurement and repealing Directive 2004/18/EC will continue to be implemented in VOB/A. However it will take some time to formulate concrete specifications. When notice of the new VOB/A is issued, publication of the new full edition of the VOB will ensue. This will replace VOB 2012 in 2016.

I should like to especially thank the Main Building and Civil Engineering Committees (HAH) and (HAT) and their working committees for making this Supplement possible. It is thanks to the hard work and commitment of the numerous experts that the VOB is a tool whose practical relevance is recognized in equal measure by both clients and contractors.

I am certain that the VOB will continue to meet its obligation to uphold what has been tried and tested while at the same time paying due regard to the need for continual improvement

The Board of Management of the Deutscher Vergabe- und Vertragsausschuss für Bauleistungen (DVA)

Günther Hoffmann