Castle Schlatt


Castle "Schlatt unter Krähen”, located in the Southern part of Germany, is an imposing three storey massive building with a rectangular design and a high span roof. The south side shows a represensentative front with regular windows and an ornamental portal. At the corners are four octagonal towers which apparently still have their original roof. The building is typical for its year of origin, 1592.

The builder of the castle was Hans-Ludwig of Bodmann. He was one of many in a succession of owners.Today Lord Patrick Douglas, Baron of Reischach is the owner. Family Douglas has its roots in the old Scottish aristocracy. He renovated the building over the course of time and the Castle today is still an aristocratic residence that is maintained with generous funding and loving care.


The castle stems from the 15th Century and has no basement (see plan sketch). The masonry mostly consists of sand-lime brick. The measured degree of dampness on the plaster before the start of the Aquapol application was between 1.2 m and 3.0 m. The symptoms of damage were unequivocally visible (see photos). Strong mouldy smell was noticeable. The rooms were inhabited only sporadically or not at all. The capillary water transportation occured through the plaster, and the mortar joints, and least of all through the stone masonry.


The ground floor should be dehydrated economically without any intervention to the building substance. The replacement of the plaster was programmed to be done after the “evaporation phase”.


To better follow up the dehydration process, a total of 6 measurement points were established and monitored during the dry-out process. For each moisture measurement point, masonry samples were taken from the wall from a depth of 15 - 20 cm.

On the first anual measurement a dehydration trend was measurable especially at the critical measure points (M4 bottom, M6 middle). One area was already dry after one year (M2 bottom). At that time the old salty plaster was still on the wall!

On the second anual measurement some areas were in a dry range. (M1bottom, M2 top, M2 bottom, M6 middle and bottom). The last measurement confirmed moisture levels in the tolerance range in all areas . Interim rises of dampness are traceable to moisture thrusts respective differences in the drilling examples taken. In the influence area of measurement point M4 (bottom) a tube opening was sealed at the end of 1998 because this area of masonry had not fully dried out yet.


Please see below some pictures of the project. Clicking on the main window will bring up higher resolution pictures.

Interview with the Castle's Architect

Interviewer: Mr.Architect Wintter, how did you find AQUAPOL?

Architect: From my customer Earl Douglas. I have done contracts for him over a period of 10 years.

Interviewer: How did things develop then?

Architect: The masonry of the castle was thoroughly wet up to a height of 2 meters. The plaster fell off. I thought we could not save it anymore. We got specialists here that offered us masonry saw cuts or chemical injections.

Interviewer: How much would the costs have been?

Architect: The offers were between 20,000 and 22,000 Euro. That is extremly expensive, and some of them were without guarantee. They would also have been difficult to
carry out as the flooring of the Castle is partially below ground level.

Interviewer: Why was AQUAPOL chosen then?

Architect: My customer told me about a machine that could dehydrate inexpensively without interference to the masonry. I could not really believe it, nor quite
understand. I could not make the decision so Earl Douglas decided for me.

Interviewer: So, in 1996 the installation took place?

Architect: Yes, and the half-yearly moisture measurements that I witnessed, together with a civil engineer, showed a definite downtrend. The unbelievable is, that about
2 years later the masonry was dry, with the exception of a natural residual moisture.

Interviewer: Have supporting precautions been done?

Architect: Yes, after approximately 2 years the old oversalted plaster was removed and replaced with a new “air-lime mortar”.

Interviewer:  Was drainage necessary?

Architect: I recommended it but the Countess did not want it. Mr. Mohorn also saw no necessity due to the small differences in the levels. It obviously is working
without an extensive drainage.

Interviewer: Is your scepticism due to the long-term experience now gone?

Architect: Yes, even the Department of Protection of Historic Buildings and Monuments offered their congratulations!

Interviewer: Thank you for the interview Mr. Wintter.

Castle Schlatt


Earl Patrick Douglas

Supervising Institution

Engineering Office Dziuba

Start Date

31 July 1996

End Date: Building Dry

15 April 1999 (about 3 years)

System of Moisture Measurement

DARR Method

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