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Abstract. The aim of the paper is to present the state of the building erected in the OWT technology. The construction of the building has not been completed due to the financial problems of the late 90's of the XX century. As a result of the long-term environmental impact, the object was degraded due to the lack of a flat roof and windows. The impact of precipitation, wind and biological corrosion led to significant degradation and deterioration of structural elements and joints. The paper will present examples of damage caused by environmental impacts. Examples of damage of wall and floor elements as well the deeply corroded steel plate joints will be presented. Highly grown lichens, mosses or mold will be also presented as the examples of biological interactions onto the surface of constructional elements. Structural elements have been tested in a nondestructive manner using sclerometer tests. The results will be described and the conclusions will be presented. The analyzed object presents in an interesting manner that environmental influences could destructively affect the construction of precast RC structural elements, which constitute a significant percentage of the Polish construction market.

Buildings made in technology of Large Panel System (LPS) are the main segment of the construction market in Poland. Since the late 1950's construction made of precast elements were erected in all regions of the country. The elements produced in in-site precast factories did not meet the system requirements. The overview of the technical state of building made of precast reinforcement concrete flat-plate erected in the 1989 is presented. The erection of the building was stopped before the flat roof was embedded. Since then the building has been standing unused. The building was made in OWT system, one of the LPS developed in Poland. The information about the construction of the joints between various walls was presented. The state of concrete and reinforcement steel treated by atmospheric and biological influences are also mentioned. The differences between dimensions of connection elements in joints in analyzed building and in the system catalogue were presented. The manner of construction of joint in the building is discussed. The paper is finished by some comments about building construction and structure safety.

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