The composite board materials with woodchip fillers and nonprocessable flax and cotton processing waste based on the thermosetting binder matrix can be used as construction material for thermal insulation purposes. Research methods of temperature and humidity change influence on adhesive-bonded board materials’ qualities are reviewed. The results of strength and loss of mass behaviour of board materials after the cyclic tests of soaking/freezing/thawing/drying are discribed. Board of unrecoverable waste spinning flax and cotton have the remaining strength is more than 60 % after ten cycles. The experimental data confirm the existence of long-term resistance of the composites to variable temperature and humidity effects.