TECHNICAL MANUAL RADIANT FLOOR HEATING CONTROLS AND REQUIREMENTS OF SUBSTRATES A few special instructions are to be followed in case of: Radiant floor heating The heating system has to be turned on before the installation of any floor covering to allow for conditioning of the screed . This is to make sure that after the first heating, the screed is not damaged by the sudden change of temperature or at least could be repaired before proceeding. The operations to carry out are: 1) Do not turn the system on before 28 days from when the screed was cast. 2) The temperature of the heating fluid should be increased by 5 °C per day up to the maximum service temperature. 3) The maximum temperature has to be kept for at least three days. 4) Reduce temperature of 5°C a day to reach the same temperature of the room. 5) Heating must be turned off 24 hours before starting the smoothing underlayment. The heating can be turned on gradually 24 hours after the installation of the floor. b) Existing hard flooring The most common floors in building renovations are ceramic, natural stone and cement. Loose tiles and grout should be removed and uneven areas filled up with adequate smoothing products. In presence of waxes, it is necessary to wash with a solution of soda and hot water, rinse and apply a primer. Grease, oil, paint should be removed by scarifying through mechanical action in order to remove them and facilitate the bonding of the smoothing underlayment. c) Special supports For special supports (metal decking, asphalt , timber etc.) please contact Artigo Technical Assistance. Controls and requirements of substrates: Whatever the substrate is made of, the flooring layer has to check it carefully and to ask the main contractor to undertake the actions required to correct the detected defects. Levelling Uneven surfaces or differences in level between areas will certainly require smoothing underlayment and or repair to be carried out; Moisture Residual moisture must be checked with a calcium carbide hygrometer and must be below 2% without suspects of future hydrostatic pressure; Cohesion After cleaning the substrate, the surface should not be easily scratchable with a metal point (such as a nail) and all contamination which could impair the effectiveness of the adhesive shall be removed; Cracks Any crack existing on the substrate shall be repaired before starting the smoothing underlayment. When cracks are going through the thickness, the screed has to be removed and cast once again. ENGLISH 7 In case the above mentioned basic requirements are not satisfied the installer should refuse to install. 6
Download PDF file
Build your own flipbook