Abstract
Destructive tests are not usually allowed in historic buildings; only non-destructive tests can be performed there. The obtained results should deliver the repair solutions that do not interfere into the historic layout of the church architecture and structure. One of the rarest areas subjected to non-destructive testing is diagnostic testing of wooden structures. However, calculations of strength verification cannot be performed if the wood class and quality are not determined. This paper describes in situ non-destructive testing of timber structural components of the roof truss system in the 19th century church in Osiecznica. The applied techniques were the standard ultrasonic and sclerometric methods, and additionally the original ultrasonic method with an instrument for analyzing the flow velocity of transverse waves.
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