(57) Method for treating building materials by means of the impregnation-technique characterized
by spraying an excess of treatment liquid on the pieces which are to be treated. Spraying
apparatus, for carrying out the method in accordance with the invention, consisting
of a closeable booth (1) and provided with nozzles (13 & 65), a system (2) of tanks,
pumps, taps and conduits; characterized by a frame (5) which is movable to and fro
within the booth (1) and which carries the nozzles (13 & 65); by the mutual connection
conduits of the tanks and by two or more hoses (17 & 50) which are wound on a auto-rewinding
hose reel (16 & 51) and which supply the nozzles (13 & 65) with liquid.
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