Publicly appointed and certified expert on screeds and floor coverings

Your screed, floor covering or floor construction in general is faulty and shows signs of damage? You are looking for an expert to help you out? I would be pleased to visit you on site and examine the floor in its surroundings. If necessary, I have other experts on hand to take floor or screed samples and take them to the lab by my order and for my account. On the basis of the examination results I will write a report for you or your insurance company, establishing a connection between the damage and its causes and explaining it in detail. At your request I can suggest adequate repair measures, too.

As an architect I am not only concerned with floor constructions in particular, but also with physical aspects such as moisture protection or water vapour diffusion. In this context mistakes are often made at the planning stage or by the supervisory staff. That is why I frequently support architects, contractors and supervisors if any floor-related questions should arise beforehand.

As an expert appointed by the Chamber of Crafts I am all too familiar with the daily business of laying screeds and floor coverings. As an architect I am able to assess planning implications and as author of the FLOOR MANUAL I am concerned with clarifying and avoiding damage to screeds and floor coverings.

Well aware of the fact that in a case of damage often every hour or day counts, I try to be flexible timewise and will be on site at short notice. Expert’s opinions will be delivered as soon as all relevant findings have been sifted.

A. Unger, PhD, Architect / Civil engineer
Owner of the engineering firm for floor and screed technology
Membership in these institutions:
  • Bavarian Chamber of Architects
  • DIN standards committee on screeds (Sp CEN/TC 303)
  • German Association of Specialist Journalists


Core competence:
  • Expert’s reports
  • Consulting
  • Mediation in screed- and floor-related affairs
  • Lectures
  • Author of the FLOOR MANUAL (written in German)
  • Specialist journalist


  • Language support for building projects abroad


  • German
  • English
  • Spanish
  • French
  • Italian

A. Unger, PhD, is author of the FLOOR MANUAL, the German standard reference book on the correct planning and laying of screeds and floor coverings. It is intended as a book by an architect for architects and anybody else interested in floors.

English subtitles available – please press subtitle button after starting the film
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For his doctoral dissertation A. Unger, PhD, developed an energy-saving screed particularly suitable for the refurbishment of buildings. It is a cementitious screed showing the following special properties:

Extremely thin and light-weight, energy-saving, high load-bearing capacity, reduced shrinkage, open to water vapour diffusion, fast-drying, non-flammable, sustainable and environment-friendly, complying with low emission standards, recyclable, etc.

For more detailed information see

English subtitles available – please press subtitle button after starting the film

If you are interested in my giving a lecture or a seminar in your region or on your premises, please note the list of possible topics below.

Of course you can also pick any topic dealt with in the FLOOR MANUAL.

To arrange an appointment please contact A.Unger, PhD.

Suggested topics for lectures by A. Unger

  • “Screed on wooden beam floors – never again??”
    This lecture deals with different floor constructions
    that can be applied to wooden beam floors. It especially focuses
    on possible dangers and technical particularities of various floor types.
  • “Cracks in silicon joints – a planning mistake or a foreseeable constructional defect?”
    This lecture explains why cracks keep appearing in elastic joints
    and presents ways of minimizing floor deformation.
  • “And what happens to all the water in the concrete slab?”
    This lecture is concerned with the residual water locked in unfinished concrete
    and points to typical defects connected with it. In addition, ways of minimizing or avoiding defects
    due to residual water in the concrete slab are shown.
  • “Reinforcement of screeds”
    This lecture gives advice on when and how to use reinforced screed.
    Furthermore, different reinforcement techniques are presented.
  • “Thermal insulation in floor constructions”
    This lecture presents all sorts of insulating materials and explains which thickness
    is necessary to reach a certain heat transition coefficient.
    Construction types according to German regulations on saving energy are illustrated.
  • “Examples of damage and defects from an expert’s practical experience”
    This lecture focuses on case studies that are dealt with in detail
    and are illustrated by appropriate pictures. Possible remedies are suggested.
  • “Damage due to condensate in floor constructions”
    Typical cases are described in which inadequate thermal insulation has led
    to the precipitation of condensate within the floor construction.
    Moreover, measures necessary to avoid this phenomenon are explained.
  • “Damp-proof membranes in floor constructions”
    This lecture introduces various ways of proofing in floor constructions
    and shows how a proofing should be made to meet the German Industrial Standard (DIN).
    Alternative methods are also explained.
  • “Planning floor constructions”
    This lecture aims at giving planners advice on the appropriate construction of floors
    taking into account the following aspects:
    - Examination of the basis and preliminary work
    - Adapting the floor construction to the expected load
    - Incompatibilities between different materials
    - Planning of joints
  • “Points to observe when planning and laying heated screeds”
    Points to observe when planning and laying heated floor constructions are illustrated.
    Special emphasis is put on expansion and its constraints, bays and correct heating.
  • “Different kinds of screed”
    This lecture presents different types of screed and explains their particular advantages
    and disadvantages as well as their respective range of application.
  • “Outdoor floor constructions”
    It is explained how outdoor floor constructions (e.g. on balconies or terraces) can be made.
    Necessities such as damp-proof or geotextile membranes are dealt with.
  • “Creation of joints by means of appropriate profiles”
    This lecture explains the use of suitable floor profiles for various joint types.
  • “The use of accelerated screeds”
    Which accelerated screed systems are there?
    Which results can be expected?
    What are the dangers?
  • “Deformation in floor constructions”
    What do typical forms of deformation in floor constructions
    look like and how can they be minimized?
  • “Refurbishment techniques in old buildings”
    This lecture stresses the particular situation of floor constructions in old buildings
    that are to be redone and gives advice on adequate refurbishment techniques.

Lectures at the following institutions and companies:

  • Akademie Quo Vadis
  • Allgemeine Bildungsgesellschaft mbH Chemnitz
  • Architektenkammer Baden-Württemberg
  • Architektenkammer Bayern
  • Architektenkammer Sachsen
  • Architektenkammer Thüringen
  • Architekten- und Stadtplanerkammer Hessen
  • Ausbildungszentrum der bayerischen Bauindustrie Stockdorf
  • Bauberatung Zement
  • Bauhaus Akademie Schloss Ettersburg gGmbH
  • Bautechnik-Forum Chemnitz
  • Bayerische BauAkademie
  • Belfor-Relectronic GmbH
  • Berufsförderungsverein des baden-württembergischen Stuckateurhandwerks
  • Betonmarketing Süd
  • Bund Deutscher Baumeister
  • Chemsta
  • Deutsche Rockwool Mineralwoll GmbH & Co. OHG
  • DIN Deutsches Institut für Normung e. V.
  • Dr. Weiss & Partner GmbH Ingenieurakademie BW
  • Dreßler Bau GmbH
  • Dyckerhoff & Widmann AG
  • Fritz Eichbauer Bauunternehmung
  • GN Bauphysik Ingenieurgesellschaft mbH
  • Haus der Technik
  • Hochschule München
  • Ingenieurkammer Sachsen-Anhalt
  • Karl Krämer GmbH & Co.
  • Kraft Baustoffe GmbH
  • Landesinnung Oberösterreich der Bodenleger
  • Mapei GmbH
  • Maxit Deutschland GmbH
  • MC-Bauchemie Müller GmbH & Co.
  • PCI Augsburg GmbH
  • QV Fussboden – Die Bodenprofis
  • Rehau Akademie BAU
  • Röfix AG
  • Schwitzke & Partner GmbH
  • SSB Spezial Seminare Bau GmbH
  • Technische Akademie Esslingen
  • Trotec oHG
  • Uzin Utz AG
  • VDI Verein Deutscher Ingenieure
  • Verband der österreichischen Estrichhersteller
  • Weitzer Parkett
  • Wolff & Müller Holding GmbH & Co. KG
  • Xella Trockenbau-Systeme GmbH

Some examples of building projects I accompanied as an expert and consultant:

The following feedback is based on both, Alexander Unger’s performance in seminars and his work as an expert on floorings and screeds.

5/5 Gesamtbewertung
F. Schattenberg (Expert’s opinion), 4th Sept. 2014 (translated) 

For days I have been concerned with a defective joint in a heated screed, and my search findings on the Internet as well as enquiries with the heating system manufacturer and the concrete industry did not yield any satisfactory information on whether the defect is a grave one or just cosmetic. It was only after a telephone conversation with Alexander Unger, PhD, that I was sure of the consequences the defect would have for me. I was impressed by the straightforward service provided for a common building owner – thank you very much.

The Merbeck Family (Expert’s opinion), 27th Aug. 2014 (translated) 

Even for us living abroad Alexander Unger, PhD, gave quick, practically relevant and detailed advice. Thanks once again for everything and greetings from India.

Laszlo Brassnyo (Expert’s opinion), 30th July 2014  

We needed a technical support in a problem connected with the max. moisture content of a concrete slab, to avoid the damages of flooring constructions. There is no local norm for that value in Hungary, so it was a great help from Mr. Unger who has given us clear and useful information.

Schierholz Bau (Expert’s opinion), 30th July 2014 (translated) 

Thanks for the prompt assistance over the telephone. The answer was practically relevant and clear.

Martin Erdinger, QA head with Henn (Seminar), 24th July 2014 (translated) 

lecture very easy to follow and practically relevant>critically distancing himself from details in core literature> thoughtful response to individual questions, also after the seminar

Claudia Zuschlag, Interior designer with studio baukultur, Darmstadt (Seminar) 5th July 2014 (translated) 

A display of highly detailed information, provided in a very vivid and inspiring lecture.

Stefani Spangenberg (Expert’s opinion), 22nd May 2014 (translated) 

Actually all the positive aspects about Alexander Unger have already been mentioned: He is the leading expert on all topics concerning screeds. As a person he represents those values so much needed in the field of construction: prudence, clarity, resoluteness. He is likeable and focussed. During the 25 years of my professional career I have rarely met somebody who sets such high standards, both professionally and personally.

Ms Quennet (Expert’s opinion), 22nd May 2014 (translated) 

The report was completed quickly and very professionally.

5.0 5.0 8 8 For days I have been concerned with a defective joint in a heated screed, and my search findings on the Internet as well as enquiries with the heating system manufacturer and the c
Unsere Linkliste:

Engineering firm for floor and screed technology
Industriestrasse 12
D – 86609 Donauwoerth / Germany

phone: +49 (0)906 / 7 06 90-32
mobile: +49 (0)171 / 5 25 43 18
fax: +49 (0)906 / 233 70

Core office hours:
Monday 9:30 am – 5:00 pm
Tuesday 9:30 am – 5:00 pm
Wednesday 9:30 am – 5:00 pm
Thursday 9:30 am – 5:00 pm
Friday 9:30 am – 5:00 pm
Saturday closed
Sunday closed

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Engineering firm for floor and screed technology
Industriestrasse 12
D - 86609 Donauwoerth / Germany