An increasing number of concealed dry rot attacks, especially in older multi-storey houses under renovation, have been detected during the last few years. A necessary consequence is a demand for cheaper methods of repair, compared to the standard method used in Denmark for many years otherwise severely attacked houses will by pulled down. A heat-treatment has been developed and tested in practice. Time will finally prove the efficiency of this method. For quick and easy control of the viability of a fungal attack in wood, a stain method has been developed for light microscopy.

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