Weak current College】 【JGJ142-2004 technical specification for floor radiant heating.

<br> <br> Preface <br> This standard is based on the Ministry of construction's standard <2002> 84, "on printing and issuing the scrutinised one-second unsuccessful second annual construction urban construction, construction engineering industry standards, amendments to .the plan on informed "requirements, the China Academy of building units for Editor-in-Chief, together with the relevant units. <br> This standard consists of a hot water as the heat medium and heat source for heating cable, floor radiant heating .engineering design, material selection, construction, commissioning and acceptance, as well as content. <br> Chapter 1 General provisions <br> Section 1.1.1 in order to standardize floor radiant heating engineering design, construction and acceptance, technology advanced, affordable, .safe application and ensure project quality, especially formulates this order. <br> Section 1.1.2 of the statutes applicable to the new industrial and civil buildings, with hot water as htm or heating cable for heat source, floor radiant heating engineering design, construction .and acceptance. <br> 1.1.3 of floor radiant heating engineering design, construction and acceptance, in addition to the implementation of this regulation, shall comply with existing relevant standards, specifications, etc. <br> Chapter II: terminology <br> .Section 2.1.1 low temperature hot water floor heating (lowtemperaturehotwaterfloorradiantheating) <br> Taking the temperature not higher than 60 ° c hot water as htm, buried in the ground following fill layer in circulating flow heating tubes, heating the entire ground floor, through .to radiation and convection heat transfer to the indoor heating of a floor heating. <br> Section 2.1.2 slice, catchment (manifold) <br> Water system, used to connect various heating pipe for the distribution, and return water water collector. .<br> Section 2.1.3 of surface layer (surfacecourse) <br> Building ground directly under a variety of physical and chemical effects of surface layer. <br> Section 2.1.4 article screed (towelingcourse) <br> In bedding or floor .surfaces for Trowelling find slope of structural layers. <br> Section 2.1.5 of isolation layer (isolatingcourse) <br> Prevention of building various liquid on the floor or ground water, moisture through the ground floor of the building. <br> 2.1 ..6 fill layer (fillercourse) <br> In the insulation layer or set on the floor surface heating or heating cable used in the structure layer to protect the equipment and make the ground temperature. <br> 2.1.7 of insulation (insulatingcourse) .<br> To block the heat, reduce the heat loss of structure is not valid. <br> Section 2.1.8 of moisture-proof layer (moistureproofingcourse) <br> Prevent the building Foundation or floor ground moisture through the ground floor of the .building. <br> The first section 2.1.9 (expansionjoint) expansion joints <br> Compensating concrete fill layer, the superstructure layer and layer such expansion or contraction of tectonic joints. <br> The aluminum models duplex tube section 2.1.10 ( .polyethylene-aluminumcompoundpipe) <br> Inner and outer for polyethylene, cross-linked polyethylene or a reinforced middle layer and layer of aluminum pipe of special melt, through extrusion methods combined with integrated heating pipe. According to the aluminum tube welding methods, divided into .lap welding and butt welding of two forms, is usually marked by XPAP or PAP. <br> Chapter 2.1.11 of polybutylene pipes (polyebutylenepipe) <br> By polybutene-1 resin adding just the right amount of additives, the extrusion thermoplastic heating .pipe, usually marked with PB. <br> Section 2.1.12 of cross-linked polyethylene pipe (crosslinkedpolyethylenepipe) <br> A density greater than or equal to 0.94g/cm3 of polyethylene or ethylene copolymer, adding just the right amount of additives ., chemical or physical methods, linear macromolecules crosslinked into the three-dimensional mesh macromolecular structure of heating, usually to PE-X tags. Follow the way of the cross, can be divided into peroxide Crosslinking polyethylene (PE-Xa), silane xlpe ( .PE-Xb), electron-beam cross-linked polyethylene (PE-Xc), azo xlpe (PE-Xd.) <br> Chapter 2.1.13 of copolymer tube (polypropylenerandomcopolymerpipe) <br> To propylene and just the right amount of .ethylene copolymer, adding just the right amount of additives, the extrusion thermoplastic heating pipe. Usually PP-R tags. <br> The first section of block copolymer polypropylene 2.1.14 tube (polypropyleneblockcopolymerpipe) <br> To propylene and ethylene copolymers, adding .just the right amount of additives, the extrusion thermoplastic heating pipe. Usually PP-B tags. <br> Chapter 2.1.15 of heat-resistant polyethylene pipe (polyethyleneofraisedtemperatureresistancepipe) <br> To ethylene and octene copolymerization of ethylene copolymer in density linear, .adding just the right amount of additives, the extrusion of a thermoplastic heating pipe. Usually PE-RT tags. <br> Chapter 2.1.16 bar black bulb temperature (blackglobetemperature) <br> By black ball thermometers indicate temperature values, habits, also .called real feel temperature. <br> Chapter 2.1.17 bar heating cable (Heatingcable) <br> For heating purposes, after power cables can be fever, usually heat conductor, insulation, grounding shield layer and an outer sheath. <br> The .2.1.18 bar heating cable floor radiant heating (HeatingCablefloorradiantheating) <br> The outer surface of the working temperature of up to 65 ° c in the heating cable laying on the floor, to heating cable for heat heating floor to thermostat control room or floor .temperature, realization of floor radiant heating of heating. <br> Article 2.1.19 bar heating wire (heatingconductor) <br> Heating cable converts the energy in the heat of the wire. <br> Chapter 2.1.20 of insulation (Insulationofacable) .<br> Heating conductors or between a conductor and grounding shield fever between layers of insulation layer. <br> The first article grounding shield 2.1.21 (Screen) <br> Parcel in heating wire and metal heating insulation layer. The material can be .woven into the net or spiral-wound wire, a spiral winding or along the longitudinal enclosure heating cable wire or metal bands. <br> The outer sheath 2.1.22 bar (Sheath) <br> Protected internal heating cable are not subject to external .environmental influences (such as corrosion, moisture, etc.) of the cable outer layer. <br> The first section room temperature thermostat 2.1.23 (Thermostatwithroomsensor) <br> To the room air temperature sensors to adjust the room temperature required for an .automatic control device. <br> The 2.1.24 bar temperature thermostat (Thermostatwithfloorsensor) <br> Can floor temperature sensors, control and adjustment of automatic control device. <br> The first two-temperature thermostat 2.1.25 (Thermostatwithair & floorsensors .) <br> Can simultaneously induction room air temperature and floor temperature, controlled regulation of an automatic control device. <br> Section no. 2.1.26 (Tubeclamps) fixed clamp <br> The heating or heating cable directly fixed to the insulation plastic .tab on the nail. <br> The 2.1.27 bars strap (fixing) <br> The heating or heating cable is fixed to the wood grill or steel wires fixed bands online <br> <br> Chapter 3-temperature hot water floor .radiant heating system design <br> Section 1 General provisions <br> <br> Section 3.1.1 of low-temperature hot water floor radiant heating system for the supply and return water temperature should be determined by the calculation. Civil construction water temperature should .be 35-50 ℃, should not exceed 60 ° c, suitable for the temperature difference, backwater is less than or equal to 10 degrees centigrade. <br> 3.1.2 use of low-temperature hot water floor heating, the average temperature on .the surface of the ground should be consistent with the requirements of the table 3.1.2. <br> Table 3.1.2 ground surface average temperature (degrees centigrade) <br> Regional characteristics of the appropriate scope of maximum limits for <br> People .often stay district 24-2628 <br> Short stay district 28-3032 <br> No one stays district 35-4042 <br> Baths and swimming pool 30-3333 <br> Section 3.1.3 of low-floor radiant heating system working .pressure, should not be greater than the height exceeds 0.8MPa; 50m should set the vertical partition. <br> Section 3.1.4 regardless of heat, cold and hot water floor heating htm temperature, flow and pressure difference and other parameters used, and .the heat source system match; at the same time heat source system should set up the appropriate control device to meet low-temperature hot water floor radiant heating system operation and adjustment needs. <br> Section 3.1.5 of the low temperature hot water floor .heating engineering construction drawing design file content and depth, should meet the following requirements: <br> 1. the construction drawing design files should be mainly in construction drawings, including: blueprint directories, design notes, heating pipe layout plans, minutes, and set .water, ground structure diagram, etc; <br> 2. Design description should elaborate calculation of heating indoor and outdoor temperature, heat and thermal parameters and heating pipe technical data, specifications (nominal outer diameter X wall thickness); indicate the use of specific .conditions such as temperature, pressure and insulation materials for thermal conductivity, density (density), specifications, thickness, etc.; <br> 3. the plan shall be drawn to the specific heating pipes, marked with the laying of the arrangement, the .loop code space, heating pipe diameter, length, etc. <br> Section 2 of low-floor radiant heating system ground construction practices <br> Section 3.2.1, radiant floor heating system with floor structure, from grass-roots (floor or .ground with soil adjacent), screed, insulation (the upper part of the installation of heating pipes), expansion joints, fill layer and surface layers. You can see Appendix A. <br> 1. when the project allows for bi-directional ground .by thermal design, each floor of the upper floors without insulation. <br> 2. soil adjacent to the ground, you must set insulation, insulation and moisture-resistant layer should be set lower. Directly with outdoor air adjacent floors, must also be .set insulation. <br> 3. for humid rooms such as bathroom, swimming pool, in the upper portion of the backfill layer should set the isolation level. <br> Section 3.2.2 of low temperature hot water floor radiant heating should give priority .to the use of thermal resistance less than 0.05 m2 · K / W as a layer of material. <br> Section 3.2.3 of face-to-face layer uses the belt keel elevated flooring, heating pipe laying in the lower part of the .wooden floor, insulating layer between the keel, then you can not set the bean stone concrete fill layer. <br> Section 3.2.4, radiant floor heating systems using polystyrene foam insulation Board, its thickness should not be less than the table 3.2. .4 regulation value, if other insulation materials, according to the principle of thermal resistance equivalent to determine thickness. <br> Table 3.2.4 polystyrene foam board insulation thickness (mm) <br> Between the floor slabs on insulation 20 <br> And .soil or outdoor air adjacent floor insulation 40 <br>> Section 3.2.5 section in the external walls, columns and matrimony, vertical parts flow should the laying of uninterrupted expansion joints, expansion joints in width not less than 20mm, expansion joint use of .polystyrene or high foaming PE plastic; local surface area of more than 30 m2 or should less than 6 m length, you should set the expansion joints, expansion joints should not be less than the width, expansion joints to 8mm adopt high-foaming PE plastic .or full filled flexible expansion plaster. <br> Section 3.2.6 fill layer of material use C15 bean stone concrete, bean stone diameter not greater than 12mm. Fill layer thickness not less than 50mm. Such as ground load greater than 20KN/m2, .in conjunction with the architects used reinforcement measures. <br> <br> 3 floor radiant heating system heat load calculation <br> Section 3.3.1, radiant floor heating system, heating heat load shall be determined by the heating, ventilation and air conditioning .design code (GB50019) shall be calculated. <br> Section 3.3.2 of comprehensive cold hot water floor radiant heating system of the heat consumption, indoor temperature value should reduce 2 degrees centigrade, or taken from the calculation of the total heat loss of .90-95 per cent. <br> Section 3.3.3 of local floor radiant heating system of heat loss, can be a whole room full of radiant heating on the work of the heat consumption multiplied by the area and is located in room area ratio .and table 3.3.3 in additional coefficient. <br> Table 3.3.3 partial heating of heat load of additional coefficient <br> Heating area and room area ratio 0.550.400.25 <br> Additional coefficient 1.301.351.50 <br> The depth is .greater than the section 3.3.4 6m room, suitable for offset bounded partition wall 6m, calculation of heat load respectively and heating pipe layout. <br> Section 3.3.5 of laying the building floor heating pipe, instead of calculating heat loss to the .ground. <br> Section 3.3.6 of low-temperature hot water floor heating system, heating heat load, does not take into account the additional height. <br> Section 3.3.7 bar centralized heating heat metering or splitting independent heat source low .temperature hot water floor heating systems, consideration should be given to intermittent heating and the heat transfer between factors such as the calculation should be on the heat load to increase the degree of added value. <br> <br> Section 4 of low-floor .radiant heating system with floor thermal capacity <br> <br> Section 3.4.1 of the surface area per unit heat q (W/m2) should be calculated according to the following type: <br> q = qf + qd <br> .Unit floor area of radiation heat transfer quantity: <br> qf = 5x108 <(tpj +273) 4 - (AUST +273) 4> <br> Unit floor area of convection heat: <br> qd = α (tpj-tn .) n <br> Type: tpj-ground surface average temperature (° c); <br> AUST-Interior non-heating surface area weighted average temperature (° c); (see Appendix B) <br> Α-constant heat up ., α = 2.17; heat down, α = 0.14; <br> N-index, heat up, n = 1.31; heat down, n = 1.25; <br> Tn-indoor temperature (° c). <br> Section 3.4 ..2 article determine floors the required heat dissipation, section III, should be calculated room heating load deduction from upper floor down the amount of heat. <br> Section 3.4.3, unit floor area of the desired amount of heat shall be calculated according .to the following type: <br> qx = Q / F <br> Type: qx-unit floor area of the dissipation (W/m2); <br> Q - the room required ground dissipation (W); <br> F .- - laying heating tube surface area (m2). <br> Section 3.4.4 article determine floors heat dissipation, you must check the average temperature on the surface of the ground, to ensure that it is not higher than the table, the maximum .limit for 3.1.3; otherwise should improve the thermal performance of buildings or other auxiliary heating equipment, reduction of low-temperature hot water floor radiant heating system burden of heat load. Tpj and unit floor area of the heat dissipation of the relationship between the .approximate: <br> tpj = tn +9 (qx/100) 0.909 ℃ <br> Type: tn - indoor temperature (° c); <br> Qx-flat surface heat emission, W/m2. <br> <br .> Section 3.4.5 article htm for quantity of heat, including ground-up heat dissipation and to lower or to heat heat loss. <br> Section 3.4.6 record amount of ground heat should take account of furniture and other floor coverings. < .br> Section 3.4.7 bar unit floor area for heat dissipation and down heat transfer of heat loss, shall be determined by calculation. <br> <br> Note: when the heating pipes adopt PE-X tube or PB pipe, outer diameter .is 20mm, fill layer thickness 50mm, insulation thickness 20mm and temperature 10 ℃ backwater, different heating pipe spacing, the average water temperature and room air temperature conditions, the unit floor area of heat dissipation and down heat transfer of heat loss, you can choose .according to Appendix B. <br> Section 5, of the heating system design <br> <br> Section 3.5.1, in residential buildings, radiant floor heating system should be divided by households, the configuration system, water harvesting; indoor main .room, Yi-loop arrangement heating pipe. <br> Section 3.5.2 connection within the same minute, set on the water of the same diameter of the loops the length of the heating pipe should be as close as possible to, and should not .be more than 120m. <br> Section 3.5.3 bar heating arrangements should ensure that the principle of surface temperature uniformity, opt back into the fold type (Rotary), parallel (inline style), as described in appendix C. <br> .Section 3.5.4 bar heating pipe laying pipe spacing, according to the surface heat emission, indoor air temperature, average water temperature and the thermal resistance of surface heat transfer through computation. <br> Section 3.5.5 bar heating pipe option, you should .follow the actual design of the heating systemPressure and pipe of allowable stress designed ring, select method can be selected with reference to Appendix D. <br> No. 3.5.6 bar heating tube water flow should not be less than 0.25m / s. .<br> <br> Section 6, water harvesting and the accessories design <br> <br> Section 3.6.1 of every loop heating pipe inlet and outlet individually and separately, the set is connected to the water. And set water diameter should .be not less than the total for the return pipe diameter, and minutes, set the maximum water velocity is not greater than 0.8m / s. Each minute, set water branch should not be more than 8 road loop. For each branch loops back to .the water pipe should be set to shut off valve. <br> Section 3.6.2 in water separator before the water connection pipe, downstream should install valve, filter, heat metering equipment (heat metering systems) and the valve. In the water after .the backwater connecting pipe, you should install can turn-off control valve, balance valve if necessary. <br> Section 3.6.3 in water separator total fles and set water total should be set up between the outlet pipe, bypass pipe, bypass pipe ., valve, guarantee should be set on the heating pipe system flushing water does not flow into the heating pipe. <br> Section 3.6.4 slice, set on the water should be set manually or automatically discharge valve and discharge valve. <br> .<br> Section 7 hydraulic calculation of heating pipe <br> <br> Section 3.7.1 of heating pipe pressure loss △ P (Pa), you can press-calculation: <br> △ P = △ Pm + △ Pj <br> .Pressure loss △ along: Pm <br> △ Pm = λPa <br> Local pressure loss △ Pj: <br> Pj = Pa <br> Type: λ - pipe friction coefficient; <br> D - pipe inner diameter (m) .; <br> - Pipe length (m); <br> The density ρ-water (kg/m3); <br> Υ - water velocity (m / s); <br> Ζ-local resistance coefficient. <br .> Section 3.7.2 of plastic pipes of friction coefficient, approximate unified anxiashijisuan: <br>. <br> Λ-type friction coefficient; <br> B-water flow similarity coefficient; <br> b = 1 + <br>-Res .for resistance square district of critical Reynolds number, <br> <br> Ke-pipe roughness, m, plastic pipe, ke = 1 × 10-5m; <br> Di-pipe inner diameter of the calculation, m <br> di .= 0.5 (2do + do-4s-2s) (2) <br>-Do-outer diameter, m; <br> Do-outer diameter tolerance, m; <br> S-pipe wall thickness, m; <br> S- .tube wall thickness allowable error, m. <br> Rep-Rep actually Reynolds number, which is the water =, velocity, m / s; as with temperature of kinematic viscosity, m2 / s. <br> Plastic pipe pressure loss calculation as .Appendix E. <br> <br> Section 3.7.3 bar heating local pressure loss should be determined by calculating the heating pipe local resistance factor ξ values can be chosen according to the Appendix E-3. <br> Section 3.7.4 article .each set of content and set water loop (total since the water separator into the water valve, to set the water until the total outlet valves) of total pressure loss (excluding heat meter and thermostatic valve local resistance), not more than 30kPa. < .br> <br> Section 8 heat measurement and temperature control <br> <br> Section 3.8.1 new domestic hot water heating system, should be set based heat measurement and temperature control device. <br> The first section 3.8.2 of .low-floor radiant heating system of household heat metering, should meet the following requirements: <br> 1. should adopt common legislation in the form of independent system of household; <br> 2. heat meter before setting filters; <br> 3 .. the heating system, water quality should be consistent with the national current standard industrial boiler water quality (GB1576) requirements; <br> 4. sharing of risers and entry devices, should be set within the pipe shaft; pipeline well advised to adjacent stair .or outdoor public spaces. <br> 5. each to share a standpipe in even each layer should not be more than 3 of the number of households. <br> Section 3.8.3 of low-temperature hot water floor radiant heating system indoor temperature .control, you can select one of the following lists: <br> 1. in the heating and water, set the junction, tap settings to adjust performance of the valve, by manually adjusted to control the room temperature; <br> 2. in .the heating and water, set the junction, tap Settings, remote-control valve for self-operated or electric thermostat, through the room temperature controller controls the corresponding loop control valve on the indoor temperature remains constant. Control valve can also be built into the .water. Use of electric control, room thermostats and tap, water harvesting should be embedded between the wires. <br> 3. in each room heating (heating tubes along wall elevation to 1.4m) self-operated temperature control valve on the device, .keep the room temperature constant. <br> The first section 3.8.4 low-floor radiant heating system should be set in the heat source for heating temperature control device. <br> Chapter v-temperature hot water floor radiant heating system construction <br .> <br> Section 1 General provisions <br> <br> Section 5.1.1 of low-temperature hot water floor heating engineering, construction and installation of the former should meet the following conditions: <br> 1. Design and construction drawings and .related technical documents are complete; <br> 2. a perfect construction plan, design, and construction has been completed technology gives the low-down; <br> 3. construction site with water or power supply condition, there is a temporary storage materials .; <br> 4. the civil engineering profession in the completed wall paint (without cover), exterior Windows and outside doors have been installed, and clean up the ground; the kitchen, the bathroom should finish closed water test and acceptance; <br .> 5. various installation materials have been tested, the accompanying manuals and certification should be complete. <br> Section 5.1.2 of the heating pipes in the transport, loading and unloading and handling should be handled with care, not throw, wrestling, .roller, drag. Avoid baoshai rain should be stored at temperatureDoes not exceed 40 ° c, good ventilation and clean warehouse; kept away from heat source should be at least 1 m or more. <br> Section 5.1.3 of the construction process, .should prevent the paint, bitumen or other chemical solvent exposure to contaminated surface of the pipeline. <br> Section 5.1.4 of low-temperature hot water floor heating engineering construction, the ambient temperature is below 5 ° c. <br> Section 5.1 ..5 of low-temperature hot water floor heating engineering, it and other types of construction jobs, cross the construction process, into human Stampede heating pipe. All ground left hole should be completed before the backfill layer construction. <br> <br> .Section 2 installation of thermal insulation layer <br> <br> Section 5.2.1 of the laying of the surface of insulation shall be smooth, dry and free of debris. Wall of roots should be flat and straight, and without fouling phenomenon. < .br> Section 5.2.2 of the laying of insulation, insulation should be formed between the seams should be tight. Direct contact with soil or have moisture intrusion into the ground, in the placement of insulation before spreading a layer of moisture-resistant layer. .<br> <br> Section 3 Installing the heating pipe <br> <br> Section 5.3.1 of heating pipe should strictly follow the design drawings calibration tube and pipe laying, heating to should remain flat, straight tube spacing of installation errors should .not be greater than ± 10mm. Heating pipe laying, construction drawings should be controlled approved the selection of heating pipe, pipe diameter, wall thickness meets the design requirements; and heating pipe surface quality and tube internal for impurities such as check and confirm that there .are no issues after the installation. Heating installation interrupted or completed open Office, should be ready to block. <br> Section 5.3.2 bar heating pipe cutting special tools; incision should be formed, the fracture surface should be vertical pipe axis. < .br> Chapter 5.3.3 bar heating pipe installation should prohibit pipe screw world; curved pipe at the top of the arc should be limited (resist) and pipe clamp fixed to prevent "die off"; heating pipe bend radius should not be less than .6 times the outer diameter. <br> Section 5.3.4 of burial to fill layer within the heating pipe should not have the connector. <br> Section 5.3.5 construction inspection revealed that the heating pipes are damaged, you will need an additional .connector, according to different material plastic heating tube using hot-melt a cradled connection or bite type, press-brass fittings. Using brass fittings should be made in the external corrosion and protection measures introduced. Copper tube use mechanical connections and welded connections. Regardless .of the connectors, decorative layer should be clearly marked. <br> Section 5.3.6 bar heating pipe should be fixed units, use the following method of fixation: <br> 1. use the heating pipe fixed clamp directly fixed to the heat insulation .plates or with composite layer of insulation panels; <br> 2. use the cable ties to heating pipe fixed in paved in the insulation of the mesh; <br> 3. direct card in the laying of the surface of the insulation pipe rack or .tubes on the card; <br> <br> 4. directly fixed on the insulator surface between the notches. <br> No. 5.3.7 section heating pipe fixed spacing, straight pipe parts fixed spacing appropriate 0.7-1.0m, bent section .part of fixed spacing appropriate 0.2-0.3m. <br> The first section 5.3.8, set near the water, as well as other local heating pipes arranged relatively intensive parts, when the spacing is less than the pipe, the heating pipe 100mm .external should be set to flexible casing and other insulation measures. <br> Section 5.3.9 bar heating pipe out of the ground-water tap, set, bend at the connection section should not be exposed ground decoration layer. Heating pipe out of the .ground-water tap, set lower ball valve interface between Ming installed pipe, plastic casing should be set externally. Casing should be higher than 150-200mm decorative surface. <br> Section 5.3.10 bar heating pipes and water tap, set device and .fitting connection should be used in compression sleeve, press-extrusion clamping connection connection; fitting materials should copper; copper connections directly with PP-R or PP-B contact surface must be nickel-plated. <br> The first section of the heating pipe .5.3.11 loop arrangement should wear as little as possible, through the expansion joints, expansion joints should set length not less than the ends even · adjustment flexible casing. <br> The 5.3.12 slice, set water should start laying before the installation .of heating pipes. Horizontal installation, General water separator should be installed on the water is installed in the center distance should 200mm, set water Center distance ground shall be not less than 300mm. And set water installation view see Appendix H. <br> Section .no. 5.3.13 expansion joint settings: <br> 1. in the external walls, columns and matrimony, junction to the laying of uninterrupted expansion joints, expansion joints should use lap joints, joint width not less than 10mm; expansion joints and walls ., columns should be reliable fixation, and ground insulation connections should be tight, expansion joints should not be less than 20mm width. Joint use of polystyrene or high foaming PE plastic. <br> 2. local surface area of more than 30 m2 or side .length should less than 6 m should be no greater than 6m spacing setting expansion joints, expansion joints in width not less than 8mm. Expansion joints should be high foaming PE plastic or full filled flexible expansion plaster. <br> 3. expansion joints should be .from the top edge of the insulating layer to fill the layer with the upper edge of the entire section. <br> <br> 4 Festival-filled layer construction <br> <br> Section 5.4.1 of concrete-filled layer should satisfy .the following conditions: <br> 1. all joints are finished laying by design requirements; <br> 2. the heating pipe installed and hydraulic test qualified, heating pipe is in a State under pressure; <br> 3. through covert works acceptance .; <br> Section 5.4.2 of concrete-filled layer construction that should be borne by the party by civil construction; installation units should cooperate closely to ensure heating duct pressure not less than 0.6MPa, maintenance, the system should remain less than 0.4 .MPa. <br> Section 5.4.3 shall cast in concrete fill layer, workers should wear soft soled shoes, using grub spade. <br> Section 5.4.4 concrete fill layer of conservation cycle should not be lessThan 21 days. The conservation period ., on the ground should be properly protected, is strictly prohibited on the ground-temperature operating overloading, baking, placed directly under high temperature and high-temperature heating device objects. <br> <br> Section 5, of the surface of the construction .<br> <br> Section 5.5.1, radiant floor heating decorative surface should be in the following materials: <br> 1. cement mortar, concrete floor; <br> 2. tiles, marble, granite and other stone material ground; .<br> 3. in line with national standards of composite wood flooring, parquet and heat-resistant wood flooring. <br> Section 5.5.2 record surface construction front should determine whether the surface of the backfill layer requires aridity before construction. Surface construction ., in addition to complying with civil construction design drawing requirements, should satisfy the following requirements: <br> 1. the construction of the surface, not tick, drilling, cutting, drilling and nail the backfill layer, not to fill the layer with any .objects in the wedge; <br> 2. the surface of the construction, you must fill layer in order to meet the required strength; <br> 3. surface (stone and brick) and external walls, columns and other junction, should stay.