Who or what is GAEB?
GAEB is the abbreviation for Gemeinsamer Ausschuss Elektronik im Bauwesen (German Joint Committee for Electronics in Construction).
GAEB's task is to support the implementation of data processing in the building sector in concordance with the technical regulations of DIN Deutsches Institut für Normung e.V. and the VOB (German Construction Contract Prodcedures). GAEB is involved where the participants of a building project have to coordinate with each other.
The goal is "a common voice of all parties involved in construction.". The focus of GAEB-work is:
- Standardized texts for the descriptions of construction works,
- Guidelines for the establishment of the bill of quantities,
- Guidelines for the electronic data exchange and
- Process descriptions for the electronic building accounting
How is GAEB organized?
The German Joint Committee for Electronics in Construction (GAEB) is integrated in the Deutschen Vergabe und Vertragsausschuss für Bauleistungen (DVA) since 1 January 2005 as a main committee. The foundations for the work of GAEB are implemented in the charter of DVA.
The meeting of members is the paramount institution of the DVA.
The board of directors decides on the propositions brought forward by HA GAEB.
The main committee GAEB in the DVA makes fundamental decisions concerning GAEB work and coordinates the main working groups.
It resides in the Federal Office for Building and Regional Planning (BBR) and thus in the area of operation of the BMUB. It oversees the implementation of made decisions and coordinates the work of the main committee GAEB. It takes over the role of contact-, information- and coordination-center towards third parties.
Main Work Group 0
Develops basic issues for the GAEB work.
Main Work Group 1-3
They coordinate and plan the tasks of the trade specific work groups.
Work groups of the main work groups 1-3
The work groups develop and revise the work categories of STLB-Bau - Dynamische BauDaten-.
Main Work Group 7 - Temporary work
Main work group 7 (AGZ) coordinates the establishment, updating and maintenance of the work categories of STLB-BauZ.
Main Work Group 13 - Program systems
It develops standardized regulations for the representation for the internal and external data exchange of project information in the building industry.
Main Work Group 14 - Building accounting
It develops regulations for quantity calculation and accounting of construction works.
Which function do the partners have: GAEB - DIN - Beuth Verlag - S&P?
DIN Deutsches Institut für Normung e.V. in Berlin is the publisher of the GAEB work results.
Distribution takes place via about 40 co-distributors, in most cases building software companies, that also realized the necessary interfaces for the usage of the STLB-Bau texts for their software. Beuth Verlag GmbH is contractor for the supply of the co-distributors. Beuth Verlag GmbH is also a co-distributor.
The results of the skilled work groups are realized electronically by Dr. Schiller & Partner GmbH - Dynamische BauDaten -.
Everyone who has a valid interest in the standardization of construction works.
The simplest way is via direct contact with the GAEB branch office. Here you will be advised in detail and participation in the most suitable expert area can be jointly discussed.
You actively participate in the establishment of the texts and are the first to know about upcoming changes in standards, revisions of laws and directives of the public procurement law.
You brighten your professional horizon by getting to know other experts and their field of work and participate in workshops concerning bidding related topics.
They consist for example of representatives of public and private clients, the leading organizations of architects, engineers and the building trade, DIN and building software companies, who honorary participate in GAEB.
STLB-Bau is available on CD ROM and on the internet (offline and online)
No. STLB-Bau is based on a data base structure that allows for a infinite number of combinations. The printed book is not suitable for the display of this descriptions and contents.
STLB-Bau Dynamische BauDaten® is the most extensive data base concerning tendering texts for construction services on the European market. The information is being compiled by about 600 experts of all areas of the construction industry in more than 90 work groups and is updated twice a year. Furthermore, the direct connection to DIN as the publisher of STLB-Bau guarantees the continuing reconciliation with the current status of standardization, the legal dispositions as well as the current technical standard.
STLB-Bau was introduces with version 04-1996 and thus replaced the previous StLB (yellow books).
The texts are established by experts of the equally staffed skilled work groups of GAEB which stem from all parties involved in construction.
The honorary members of this skilled work groups provide their expert knowledge for general usage for free. Thus they guarantee the neutrality and acceptance of their work results.
Foundation of the data base oriented text storage is the current state of the art technique in consideration of VOB and the respective standards.
STLB-Bau contains text modules for the description of standardized construction works in the sense of VOB. Es ist grundsätzlich in die Gewerke nach der VOB/C gegliedert. In general, it is organized into trades according to VOB/C. STLB-Bau provides tightly formulated, technically accurate information concerning construction works. Thereby, three important criteria are adhered to:
-Totality,unambiguousnessand product neutrality of the description.
Standard texts of GAEB are geared toward the VOB.
Identifications of particular product or procedures (e.g. trade marks) may only be used exceptionally according to § 7 of VOB/A. Thus, competition restraints are excluded.
The text source is displayed in the first line of the detailed bill of quantities in the print lists.
- Text source = STLB-Bau
- Version number = e.g. 10/2000
- The work category (WCtg) = e.g. 012
- If applicable, the notation for text supplements: (TSA = contract awarder's text supplement and/or TSB = bidder's text supplement)
Example: STLB-Bau 10/2001 012 TSA
This line signals a text as a STLB-Bau text.
The regular updating of the work categories ensures that new procedures and techniques can be tendered timely and norms adapted accordingly.
Yes. These works were compiled in a separate sales package from all concerned work categories.
STLB-Bau is a text storage of GAEB without price information. STLB-Bau texts can be automatically linked to prices only in connection with the respective modules of the free market.
STLB-Bau can be installed as an individual position or in a network. Notes concerning the installation are part of every CD and are available on the GAEB-homepage under "download > STLB-Bau".
The expense of a freely texted specification of work that adheres in its description quality and its legal certainty to today's process standard according to VOB is higher than a specification with STLB-Bau texts. In the case of free texts, the editor has to carry out a time consuming comparison with the current norm standard and the contents of the technical specifications which occurs in STLB-Bau via the professional committees with their experts.
High conformity to VOB is ensured by the close collaboration with the DVA and the high correctness of the norms with the contribution of DIN.
Thus supplements can at least be significantly minimized if STLB-Bau is applied accurately.
The AVA software should have implemented the current interface to STLB-Bau for its application. The present interface for the data exchange is GAEB DA XML 3.1.
An expert consultation from your software house is advisable.
The correct implementation of the GAEB-interface also guarantees a certification carried out by the BVBS. For the list of all certified software products please visit: http://www.bvbs.de/zertifizierungen.html (only in German).
With every update, the work categories are updated technically and with regard to contents and are adjusted to the current state of the norms. For frequent usage of STLB-Bau, regular updates (service level contract) are reasonable.
„Converted on the entire construction business it has to be assumed that - based on more than 30 years of experience with the traditional Masterspecifications for Construction (StLB) and the Master Specifications for to Construction - Dynamic Construction Data (STLB-Bau) - a percentage of 75 to 80 percent of all construction works can be described with STLB-Bau.
This high utilization level of STLB-Bau will not be achieved by all users. It presupposes for the editor of the specification of work to have a profound knowledge of the public procurement and is able to exhaust all application possibilities of the Masterspecifications for Construction". (Excerpt from a study commissioned by the BBR of Prof. Reichel. S. GAEB-homepage under "Publications").
Clients often specify to produce the commissioned BoQ with STLB-Bau. Here, users and also STLB-Bau reach their limits, because all that goes beyond the "typical standard" can often not be found in STLB-Bau.
GAEB recommends users of texts that go beyond the "typical standard" to formulate freely and pay attention to remaining in the syntax of STLB-Bau.
The contract that comes about with the work item specifications based on VOB, is a service contract (Werkvertrag) in terms of the BGB. The object of this contract is the success of the described work. “BGB § 631 Werkvertrag, Hauptpflichten
(1) Durch den Werkvertrag wird der Unternehmer zur Herstellung des versprochenen Werkes, der Besteller zur Entrichtung der vereinbarten Vergütung verpflichtet.
(2) Gegenstand des Werkvertrags kann sowohl die Herstellung oder Veränderung einer Sache als ein anderer durch Arbeit oder Dienstleistung herbeizuführender Erfolg sein."
If the VOB is agreed upon in the construction contract, it keeps its service contract character. It arises from the VOB that specifications of work only describe the success of a construction work (§ 1 VOB/A: "Bauleistungen sind Arbeiten jeder Art, durch die eine bauliche Anlage hergestellt, instand gehalten, geändert oder beseitigt wird"). In addition to VOB/B, VOB/C is also part of the contract due to §1 No.1 sentence 2 VOB/B. Thus the ancillary services mentioned here have to be executed without particular mention.
STLB-Bau is generally oriented on the General Contract Conditions for Building Services in VOB/C. Thus the ready for use service is principally described in STLB-Bau. This means that the complete work is regularly expected. Thus delivery of material according to VOB/C ATV DIN 18.299 and all other functions such as producing, assembly, connecting etc. that belong to a total fulfilment of the work are included, even if they are not particularly mentioned. Something else only applies if works are explicitly mentioned as to be executed separately.
The disposal and landfilling of contaminated and not contaminated waste – STLB-Bau LB 087 – requires verification (Kreiswirtschafts- and Abfallgesetz).
The material remains property of the client (OWN), who is responsible for the disposal of contaminated material, until their appropriate disposal. He has to describe the disposal service in a separate contract and can only assign it to companies with corresponding knowledge. Here, the burden of proof lies with the client.
Special service according to ATV DIN 18 299 is: disposal of waste exceeding the services according to sections 4.1.11 and 4.1.12 (4.11.11 = disposal of waste from contractor’s scope, 4.1.12 = bagatelle regulation for the disposal of waste of the client’s scope).
Excerpt from the notes to ATV DIN 18 299: Sind größere Mengen nicht schadstoffbelasteten Abfalls als 1 m³ zu erwarten, ist in der Leistungsbeschreibung eine selbstständige Ordnungszahl (Position) vorzusehen. (If a larger amount of contaminated waste than 1 m³ is to be expected, an independent ordinal (position) is to be appointed in the bill of quantities.)
Only the detailed version is relevant.
The outline bill of quantities solely serves the brief discussion of work items, so that e.g. in accounting, positions can be differentiated from each other.
The skilled work groups of GAEB provide description characteristics from which standardized outlines are compiled. The user can select and deselect the provided features via the button marked „KT“ after the outlines.
Yes, VOB allows for this in special cases.
If such a specification becomes necessary, the addition “or equivalent” has to be used.
STLB-Bau enthält standardisierte, VOB-gerechte Texte, die automatisiert weiterverarbeitet und somit von allen Partnern ausgewertet werden können. Dies ist nur möglich, wenn keine freien, benutzerindividuellen Texte in STLB-Bau-Beschreibungen zugelassen werden. Darüber hinausgehende notwendige Ergänzungen durch Textergänzungen sind im STLB-Bau vorgesehen, z.B. bei der Erzeugnisangabe oder der Angabe in den Ausprägungen „Ausführungsunterlagen“ oder „Einzelbeschreibung“. Häufig genutzte individuelle Ausschreibungstexte können über Kundenanfragen als Vorschläge für standardisierte Ausprägungen eingebracht werden und stehen nach der fachlichen Redaktion durch die GAEB-Facharbeitskreise in den Updates zur Verfügung.
STLB-Bau enables the supplementation and change of already assembled STLB-Bau texts without problems at which the technical context of the entire text is always checked.
The work texts can be displayed outlined with the functions “reference“ and “repeat description” in the item list of the program and can be converted back into the detailed text form if necessary.
Information about a text being not complete is submitted to AVA by STLB-Bau. It is in the hands of the software company whether the application program performs an assessment or a marking.
STLB-Bau offers the possibility to not give any specification if technical statements are not necessary for technical coherence.
STLB – Bau submits the identified key – which is necessary for further assessments – to the processing program (AVA) only as an internal key.
A display on paper would be unclear because of the key size. Thus it is sufficient to submit them in the data exchange.
"TSA" = Text supplement client
Here, the client has to supplement the text.
TSB" = Text supplement contractor
Here, the bidder has to supplement the text, e.g. with product details.
Standard specifications are project related additional information/contract related regulations that may occur in every place of the bill of quantities but within a work item. Neither reference numbers (Ref. No.) nor prices are attributed to them in the work specifications.
Standard specifications that are valid for various work types are collected in LB 099. Trade specific standard specifications are contained in the trade-LBs.
The favorite list enables the user to safe compiled texts as a whole in order to retrieve them as a whole at a later point in time. So this new favorite list can make already made texts usable again with the entire content and all functions of STLB-Bau.
Every compiled text can be copied into the favorite list via a function. At the same time, every GAEB-DA XML file can be imported into the list and the included STLB-Bau positions can be updated or processed as favorites if applicable.
The organization/structure of the texts can be by choice either after work types or after DIN 276-1, issue 2006-10.
In the production of a work specification, one or more favorites can be copied into the current favorite list with/without an own key term out of the position list. The stored work texts are managed on the personal computer and can be exported as GAEB-DA XML file.
The favorite list is workplace related. Every workplace – also in the network – can thus use its own favorite list. The joint usage of one favorite list from several workplaces in the network occurs via the distribution of GAEB-DA XML files which then can be read in every workplace.
Personal favorite lists are kept in the case of an update of STLB-Bau or a change of version. A function checks for up-to-dateness with the currently installed STLB-Bau.
Possibly the safety adjustments of your internet explorer are deactivated. The setting that you need can be achieved as follows:
Open the internet explorer. Click “extras” in the menu and then “internet options.”
Here you chose the slide “saftey“ and click on „level adjust.“ Here you look for the entry „Open files on their content and not file enhancement” and set the dot before the field “activate”. After you restarted the internet explorer, GAEB-files can now be imported into the favorite list.
If your computer is part of a network it is possible, that your system administrator has deactivated or erased certain settings so that the slide for ‘safety’ may not be available for you. In this case, please contact your system administrator.
With the aid of „detailed specification number – client“ you can draw up relations between a work item and an attachment of the same bill of quantities. Here, the demanded work can be explained in more detail or in a graphic display like e.g. „Appendix 12“ or „System sketch No. 15”.
Yes, by importing them into the favorite list. Up-to-dateness is checked via an application of the presently installed version of STLB-Bau.
STLB-Bau supports you with the establishment of expert descriptions of work items which means that only those characteristics are offered to you in blue color under “selection” which are not contradictory to statements that were already made.
All characteristics that are not allowed anymore are also displayed, but in grey. If you chose one of these, STLB-Bau automatically deletes already chosen characteristics that do not concur with the new selection anymore. This deleted characteristics are still displayed until the next work step in an own section of “results” under “Deleted characteristics/text supplements.”
Suggestions concerning the position text can be submitted automatically via email to the hotline through the counter Suggestions or Questions to the position text in STLB-Bau. This can be notes to the text offers or concerning missing data which will be passed on and processed in the skilled work groups of GAEB. Here, STLB-Bau opens a form in which the selected position text automatically appears twice in the text field. One so you can make changes directly within the text, the other for comparison as an original. The client will get information about the result of his suggestions after their processing in the skilled work groups.
Key words are supposed to make the introduction to STLB-Bau easier in certain situation. STLB-Bau has a very extensive key word index. If you put a random key word with at least three letters into the key word search, the program will indicate the service types which contain this key term.
STLB-Bau Additional Tools
The STLB-Bau CD offers small useful work programs for free:
- A model bidding offer
The model bidding offer is a free tool for the development of simple specifications. However, it is not a replacement for AVA programs because of its minor functionality. In order to work with this Excel-model you need to activate macros. A guide on how to do so and additional information is provided in Excel-Help.
With STLB-Bau-Check, GAEB provides a tool which can be used to check a random specification in GAEB format for compliance to the current norms and regulations in STLB-Bau texts.
Yes, it is possible to install more than one versions of STLB-Bau-Check parallel; at times it is actually useful. Example:
A specification from 10-2007 most likely provides various notes such as “not current” or “editorial changes in long text” if it is checked with STLB-Bau-Check version 10-2008. Thus, the positions that need adjustment are illustrated to the user. On the other hand, in order to check if the specification was current at the point of its first draft, STLB-Bau-Check version 10-2007 should be used. The current version needs to be installed to get the correct test result.
Yes, brief instructions are available concerning the model bidding offer as well as STLB-Bau-Check on the homepage of GAEB in the section „Download“. These handbooks are also directly installed during the installation of STLB-Bau in the respective applications and can be accessed via the starting menu of your computer.
In term contractor work, the framework agreement is a building contract that commits the contractor to carry out predefined works on call for a fixed time period (normally one year). These works are commissioned in the form of single appointments according to the agreed terms of the framework contract.
Framework agreements can be concluded in the:
- Bidding procedure according to §6 No.1 VOB/A
- Bidding up and bidding down procedure according to §6 No.2 VOB/A
In the bidding procedure, the client has to provide type and scope of the work. The contractor puts the prices he demands for his services into the work specification or provides them differently in the offer.
In the bidding up and bidding down procedure (VOB/A § 6 No. 2), the prices that the client specified for the type and scope of work are submitted to bidders so that they can either bid up or bid down. This procedure should be adopted only in exceptional cases and only for regularly scheduled maintenance work whose scope must be kept to a minimum.
The function of the Standardleistungsbuch für das Bauwesen – Zeitvertragsarbeiten – (STLB-BauZ) is the support of recurring building maintenance work through standardized tendering texts that are specially customized for this scope. It supports the procedure according to §6 No. 2 VOB/A.
The standard work specifications of STLB-BauZ contain information about building type, building part, construction material and dimensions that are necessary for the production of the complete work. In general, no ancillary works according to VOB/C are described, with the exception of it having been settled differently in the standard specifications.
The job title "delivery and installation" is not mentioned separately in the work item specifications. Since the VOB is generally to be agreed on in fixed-term contracts, this job title is always agreed on according to VOB/C DIN 18299.
The respective attachment material as for example glue, screws and anchors are part of the work scope, if the work item specification demands as an exception the job title "install only" or "lay only".
These regulations are described in the standard work specification 000.01 and are valid for all 28 work categories.
According to this, 1 m3 of not contaminated waste from the scope of the client is part of the unit prices. In the case of more than this amount ofnot contaminated waste , the following is part of the unit prices:
Load and transport of the waste to be disposed of from the expansion site to the storage place on the building site or the property named by the client (OWN) as well as the storage and sorting according to statements of the OWN.
Further transport of the waste as well as its disposal is not part of the unit prices. Costs are to be agreed on and to be paid separately.
Disposal of contaminated waste is generally not part of the unit prices.
The special feature of STLB-BauZ is the specification of unit prices (UP) as the basis of the bidding up and bidding down procedure according to § 6 No. 2 VOB/A.
Cost factors have been taken into account in the calculation of unit prices including additional charges and discounts: labor costs, material costs, equipment costs, additional costs.
Unit prices are developed in cooperation with the professional associations representing GAEB-AG 7. They are mandated exclusively to the bidding up and bidding down procedure and may not – not even for comparison – be used for different purposes, e.g as reference prices. Prices do not contain sales taxes.
It is required that these programs have a XML interface that is able to communicate with STLB-BauZ XML. Processing programs for STLB-BauZ are available at building software companies. The program should support the prerequisites of the procurement manual (VHB).
In the data exchange, already collected data of a building project, e.g. of a bill of quantities, is made available for other parties involved for electronic processing.
If these partners want to exchange data, they need to agree on a common basis. The conventions necessary for this are described in the regulations for the GAEB data exchange GAEB DA XML. They are recognized as a national standard.
This data exchange supports all parties involved in the building process in the exchange of information concerning the execution of construction measures.
The bases is developed within GAEB in the lead working group 13 „Programming Systems“ “, coordinated with all participants and update in line with demand.
- Building authorities of the Federal Republic, the federal states and the municipality
- Architects and engineers
- Larger user groups such as the DB Netz AG,
- The executing building industry
- DIN Deutsches Institut für Normung
- Building software companies
GAEB defines the interface and processes it professionally and dv-technically. It is made available for the building software companies. These integrate the regulations of the interface DA into their expert applications. The producers of the expert applications are responsible for the correct implementation of the interface description.
GAEB-data-files are structured and standardized formats that are developed according to GAEB regulations and exchanged independently from hard- and software via the GAEB interface.
The GAEB interface – GAEB DA XML – is a structured and standardized interface, developed according to GAEB regulations. It enables the parties involved in the building process to exchange GAEB-files that contain building information, for example bill of quantities.
These information can be exchanged electronically between the parties involved in the building process. The regulations of GAEB are correctly realized in the interface which enables every EDV-system to properly assume and process the data.
First and foremost through the file endings. These are technically prescribed, namely:
|File ending e.g.||GAEB-Versions||Example|
|.P83||GAEB DA 2000||Datei.P83|
|.X83||GAEB DA 2000 XML|
GAEB DA XML
The phases of the data exchange set the content of a file in GAEB format.
The naming of the exchange phases DA 81 to DA 86 is the same in all DA-versions.
GAEB-files can be opened and processed with a suitable AVA- or calculation-software respectively, that has a corresponding GAEB interface. If the software is not available, at least a viewing tool (viewer) is needed that can also be downloaded for free in the internet. If GAEB-files are to be processed, the viewer needs to be equipped with a fill in function.
STLB-Bau additionally provides a STLB-Bau bidding form which can be used to read and also process GAEB-files.
GAEB-converter, GAEB-viewer and similar products that are available on the market, are part of those tools that have been developed from third parties in the background of GAEB in their own responsibility as support of GAEB work. If applicable, the signs for textual supplements are:
(TA = text supplement client and/or TB = text supplement contractor)
GAEB DA XML is not standardized but is valid as a national standard which is documented in PAS 1067.
Norms are an ordering instrument of our technical world. The norming-work of DIN is a technical and research related service. DIN-norms are based on consensus.
On the other hand, there are technical regulations and agreements that have been reached between a group of companies or associations. For a lot of regulations, further consensus with all interested parties is not necessary.
Here, DIN provides a new and effective way. This is the development and publication of publicly available specifications PAS (PAS = Publicly Available Specification).
PAS can be developed speedily. And just as speedily, Beuth Verlag, who cooperates with DIN, organizes the publication of PAS.
DIN experts check the relation of PAS with the German, European and international norms. The result is summarized on the first page of PAS.
The author of this document who is also mentioned on the first page of PAS is solely responsible for its content.
DIN provides PAS in Germany and worldwide via the distribution network of the Beuth Verlag. Just as bibliographic data of a DIN-norm, they are included in catalogues, electronic media and the internet. Foreign norm institutes receive a copy of PAS.
The CD concerning the data exchange, that can be obtained via Beuth Verlag, contains information for the programming of the interface and for the development of bill of quantities.
The GAEB data exchange with GAEB DA XML contains, as opposed to the previous regulations concerning data exchange of 1990, a fundamentally changed syntax.
DA 1990’s method is line oriented. That means, every line has its own notation (e.g. ZA26-Langtext-) with corresponding content.
GAEB DA XML is element oriented. This means every information has its own key word. Thus, the way to modern data communication is cleared.
Currently, the exchange of LV-data is enhanced with the phase “calculation”. Also, requirements for the exchange of data for catalogues, costs, building parts, scheduling, inquiry/order have been set up with the introduction of GAEB DA XML.
Different software companies offer modules for conversion. However, this only applies to contents that are present in DA 1990 as well as in GAEB DA XML.
XML – short for eXtensible Markup Language.
XML is an internationally acknowledged description language; at the same time it is a meta-language, a language for the definition of the structure of a document. XML allows for the coding of documents and the inclusion of qualified electronic signatures. Thus the electronic exchange of the building contract is possible.
Here, "DA" generally stands for "Datenaustausch" (data exchange. The single exchange phases are marked with "xnn". “. The exchange files get the corresponding endings ".xnn" "nn" stands for the respective exchange phase: e.g. ".x83 tendering order".
x81, Bill of quantities transfer – is the notation of an exchange file that hands over the BoQ-data of the architect/engineer to the owner (OWN) in the area of planning in a particular format
x83, Bidding order – is the notation of an exchange file that hands over the BoQ-data of the OWN to the contractor in a particular format.
x84, Bidding offer – is the notation of exchange file that contains the offering data in a particular format and is given back to the OWN.
Sample files for GAEB DA XML, Version 3.0, are available to download on www.gaeb-da-xml.de.Sample files for Version 3.1 are in preparation. In the case of texts that exceed the usual standard, GAEB recommends to formulate freely and mind the syntax of STLB-Bau.
GAEB provides downloads of sample files on its homepage. These can be used to test an AVA-program for its adherence to the regulations of the data exchange.
The correct implementation of the GAEB interface in a software is also guaranteed by certification of BVBS. You can find a list of certified software products on http://www.bvbs.de/zertifizierungen.html