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Technical code for slope roof engineering
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GB 50693-2011
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Basic data | Standard ID | GB 50693-2011 (GB50693-2011) | | Description (Translated English) | Technical code for slope roof engineering | | Sector / Industry | National Standard | | Classification of Chinese Standard | P32 | | Classification of International Standard | 91.060.01 | | Word Count Estimation | 137,153 | | Date of Issue | 2011-05-12 | | Date of Implementation | 2012-05-01 | | Quoted Standard | GB 50005; GB 50009; GB 50011; GB 50015; GB 50176; GB 50205; GB 50206; GB 50404; GB/T 6891; GB/T 10801.1; GB/T 10801.2; GB/T 12754; GB/T 12755; GB 12952; GB/T 17795; GB 18242; GB 18243; GB 19686; GB/T 20474; GB/T 21149; GB/T 21558; GB/T 23932; JGJ 155; JC/T 746; JC/T 942; JC/T 1067; JC/T 1068; JC/T 1070 | | Regulation (derived from) | Bulletin of the Ministry of Housing and Urban-Rural Development 1029 | | Issuing agency(ies) | Ministry of Housing and Urban-Rural Development of the People's Republic of China; General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China | | Summary | This Chinese standard applies to new construction, expansion and renovation of industrial buildings, civil engineering sloping roof design, construction, and quality inspection. | GB 50693-2011: Technical code for slope roof engineering---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
1 General
1.0.1 In order to improve the technical level of sloping roof engineering in my country and ensure the quality of the project, this specification is formulated.
1.0.2 This code is applicable to the design, construction and quality inspection of new construction, expansion and reconstruction of industrial buildings and civil buildings with sloping roofs.
1.0.3 The design and construction of the sloping roof project shall comply with the national regulations on environmental protection, building energy conservation and safety, and corresponding measures shall be taken.
1.0.4 Mature new materials, new technologies and new techniques should be actively adopted in slope roof engineering.
1.0.5 The design, construction and quality acceptance of the sloping roof project shall not only comply with this specification, but also comply with the current relevant national standards.
2 terms
2.0.1 slope roof
Roofs with a slope greater than or equal to 3%.
2.0.2 roof boarding
The load-bearing plate used for supporting the thermal insulation layer and waterproof layer of the sloping roof.
2.0.3 Waterproof underlayment
Waterproofing material usually laid under tiles or metal panels in pitched roofs.
2.0.4 lock layer of nail
The structural layer that can hold the fixing nails in the tile roof, such as fine stone concrete layer and roof panel, etc.
2.0.5 Vapor barrier
Block water vapor from entering the structural layer of the thermal insulation material.
2.0.6 Flat ridge
The ridge formed by the horizontal intersection lines of the pitched roof.
2.0.7 slope ridge
The ridge formed by the oblique line of the sloped roof intersecting the convex angle.
2.0.8 slope cullis
The gutter formed by the oblique line of the slanted roof intersecting the concave angle.
2.0.9 lapped cullis
Lay asphalt tiles on the inclined gutter, and the gutter formed by lapping tiles on both sides.
2.0.10 Knitted cullis
Asphalt tiles are laid on the sloped gutter, and the gutter formed by weaving tiles on both sides.
2.0.11 open gutter open cullis
The tiles are laid to the edge of the gutter, and the bottom of the gutter is formed by coiled material or metal plate structure.
2.0.12 Overhang
The eaves structure of the outer wall or verandah is protruded from the roof towards the drainage direction.
2.0.13 tiles
A block-shaped rigid roof tile made of materials such as clay, concrete, and resin.
2.0.14 corrugated bitumen sheets
Corrugated tiles made of plant fibers impregnated with asphalt.
2.0.15 corrugated resin sheets
Corrugated tiles made of synthetic resin and fiber reinforced materials as the main raw materials.
2.0.16 Photovoltaic tile
A complex of solar photovoltaic cells and tiles.
2.0.17 Photovoltaic waterproof sheet
A complex of solar photovoltaic thin film cells and waterproof membranes.
2.0.18 Mechanical fastener fastener
Fixing nails, gaskets, beading and other accessories for mechanically fixing thermal insulation materials and waterproof membranes.
2.0.19 metal plate roof
Building roofs with profiled metal panels or metal-faced insulating sandwich panels.
2.0.20 Assembly-type light sloping roof
The sloping roof system is composed of cold-formed thin-walled steel trusses or wooden trusses as the load-bearing structure, light-weight thermal insulation materials, light-weight tiles, etc.
2.0.21 Wind uplift resistance
A measure of resistance to upward loads on the roof caused by wind forces.
2.0.22 ice dam
The water-retaining ice body formed by icing on the eaves of the roof.
3 basic rules
3.1 Materials
3.1.1 For sloping roofs, the roofing materials should be selected according to the structural level, environmental conditions and functional requirements. Materials should be reasonably configured, safe and reliable.
3.1.2 The materials used in the sloping roof project shall meet the following requirements.
1.The variety, specifications, performance, etc. of the materials shall comply with the relevant national product standards and design regulations, and meet the requirements of the service life of the roof design, and the product qualification certificate and test report shall be provided;
2 The design documents shall indicate the type, model, specification and main technical performance of the material;
3 Energy-saving and environment-friendly materials should be used for sloping roof projects;
4.After the materials enter the site, samples should be re-inspected according to the regulations, and a test report should be submitted;
5 The materials used for sloping roofs should be stored in a cool, dry, and ventilated place, away from sunlight, rain, and moisture, and are strictly prohibited from approaching fire sources; transportation should comply with relevant standards.
3.1.3 It is strictly forbidden to use unqualified materials in the slope roof project.
3.1.4 The materials used for the sloping roof shall comply with the provisions of relevant building fire protection codes.
3.2 Design
3.2.1 The engineering design of sloping roofs should follow the principle of "reliable technology, adapting measures to local conditions, and being economical and applicable".
3.2.2 The slope roof engineering design shall include the following contents.
1 Determine the waterproof level of the roof;
2 Determine the slope of the roof;
3 Select roofing engineering materials;
4 Waterproof and drainage system design;
5 Thermal insulation, thermal insulation design and energy-saving measures;
6 Ventilation system design.
3.2.3 The engineering design of sloping roofs should be divided into first-level waterproofing and second-level waterproofing according to the nature, importance, regional environment, functional requirements of the building and the design service life of the roof waterproofing layer, and should comply with Table 3.2.3 provisions.
3.2.4 According to building height, wind force, environment and other factors, determine the slope roof type, slope and waterproof cushion, and shall comply with the provisions of Table 3.2.4.
3.2.5 When asphalt tiles, block tiles, corrugated tiles and profiled metal plates for first-level fortification are used for slope roofs, waterproof cushions shall be provided.
3.2.6 The important parts such as the waterproof structure of the sloping roof shall have the detailed diagram of the node structure.
3.2.7 The thermal insulation layer of the sloping roof shall be determined through the thermal engineering design of the building and shall comply with the relevant regulations.
3.2.8 When the thermal insulation layer is laid on the prefabricated roof panel, a vapor barrier layer should be installed.
3.2.9 The slope roof shall be calculated according to the relevant provisions of the current national standard "Code for Loading of Building Structures" GB 50009.Asphalt tile roofs, metal sheet roofs and waterproof membrane roofs shall be provided with wind-resistance test reports according to the design requirements.
3.2.10 In areas where the roof slope is greater than 100% and the strong wind and seismic fortification intensity is above 7 degrees, measures such as strengthening the fixing of tiles to prevent tiles from sliding should be taken
3.2.11 The thickness of the nail-holding layer should meet the following requirements.
1 When the nail-holding layer is wood, the thickness should not be less than 20mm;
2 When the nail-holding layer is plywood or oriented strand board, the thickness shall not be less than 11mm;
3 When the nail-holding layer is structural plywood, the thickness shall not be less than 9.5mm;
4 When the nail-holding layer is fine stone concrete, the thickness shall not be less than 35mm.
3.2.12 The reinforcement mesh in the fine stone concrete leveling layer, nail-holding layer or protective layer shall be connected with the pre-embedded steel bars at the roof ridge and cornice.
3.2.13 The energy-saving measures for sloping roofs in hot-summer and cold-winter regions, hot-summer and warm-winter regions and mild regions should adopt ventilated roofs, heat-reflecting roofs, enclosed air interlayers with aluminum foil or roof planting, etc., and should comply with the current national standards. The relevant provisions of the standard "Code for Thermal Design of Civil Buildings" GB 50176.
3.2.14 When the roof slope is greater than 100%, internal thermal insulation measures should be adopted.
3.2.15 The engineering design of the sloping roof shall comply with the provisions of the relevant building fire protection design codes.
3.2.16 In areas where the average temperature of the coldest month in winter is lower than -4°C or where the eaves are severely frozen, a layer of self-adhesive or full-adhesive waterproof cushion for anti-ice dam return water should be added to the eaves. The additional waterproof cushion should extend upward from the cornice and exceed the centerline of the outer wall by no less than 1000mm.
3.2.17 The eaves of sloping roofs in severe cold and cold areas should take safety measures to prevent ice and snow from falling
3.2.18 The longitudinal slope of reinforced concrete gutter should not be less than 1%. The gutter should be waterproofed.
3.2.19 The drainage design of the sloping roof shall meet the following requirements.
1 The sloping roofs in rainy areas shall adopt organized drainage;
2 Unorganized drainage can be used in areas with little rain;
3 Anti-scouring measures shall be taken at the water outlet of the downpipe that spans high and low across the roof.
3.2.20 The organized drainage method and the number of downpipes on sloping roofs shall be determined according to the relevant provisions of the current national standard "Code for Design of Water Supply and Drainage in Buildings" GB 50015.
3.2.21 The planting design of the sloping roof shall comply with the relevant provisions of the current industry standard "Technical Regulations for Planting Roof Engineering" JGJ 155.
3.2.22 When the roof is equipped with auxiliary facilities such as solar water heaters, solar photovoltaic panels, lightning protection devices and TV antennas, the following regulations shall be met.
1 The load of the roof structure bearing the ancillary facilities shall be calculated;
2 The wind load of the roof ancillary facilities shall be calculated;
3 The installation of auxiliary facilities shall meet the design requirements;
4 Waterproof sealing measures shall be taken at the connection between the supporting embedded parts of auxiliary facilities and the roof waterproof layer.
3.2.23 The waterproof structure using photovoltaic tiles and photovoltaic waterproof membranes on the roof can be implemented in accordance with the relevant provisions of this specification.
3.2.24 The design of daylighting skylights shall meet the following requirements.
1 When the drainage board is used, rainproof measures shall be taken;
2 The connection between the daylighting skylight and the roof shall be provided with two waterproof fortifications;
3 There should be dew condensation water discharge measures;
4 The glass used for the skylight shall meet the relevant safety requirements;
5 The wind pressure resistance, water tightness and air tightness of daylighting skylights shall meet the requirements of relevant standards.
3.2.25 Facilities such as safety buckles used during construction and maintenance shall be set on the sloping roof.
3.3 Construction
3.3.1 Before the construction of the sloping roof project, the joint review of the drawings should be passed, and the detailed structure in the construction drawings should be reviewed; the construction unit should prepare the construction plan, technical measures and technical disclosure.
3.3.2 The sloping roof project should be constructed by a professional team with corresponding qualifications, and the operators should hold a certificate to work.
3.3.3 The pipes, facilities and embedded parts passing through the roof shall be installed before the construction of the waterproof layer.
3.3.4 After the waterproof cushion construction is completed, tile or roofing materials should be laid in time.
3.3.5 When laying tiles, tiles should be stacked evenly and scattered on the roof, working from bottom to top. The annual maximum frequency wind direction of the site where the tile material Yishun project is located is laid.
3.3.6 The construction of thermal insulation materials shall meet the following requirements.
1 Thermal insulation materials should be laid according to the design requirements;
2.The laying of plate-shaped thermal insulation materials should be close to the base layer, paved flat and stable, with tight joints and fixed firmly;
3.The plate-shaped thermal insulation material can be embedded between the water strips;
4 The thickness of sprayed hard foam polyurethane thermal insulation layer should meet the design requirements, and should meet the relevant provisions of the current national standard "Technical Specifications for Hard Foam Polyurethane Thermal Insulation and Waterproof Engineering" GB 50404;
5 The construction of thermal insulation materials for internal thermal insulation roofs shall meet the design requirements.
3.3.7 The planting construction of the sloping roof shall comply with the relevant provisions of the current industry standard "Technical Regulations for Planting Roof Engineering" JGJ 155.
3.3.8 The roof construction with daylighting skylights shall meet the following requirements.
1 The connection between the daylighting skylight and the structural frame shall be sealed tightly with weather-resistant sealing material;
2 The flashing at the joint between the structural frame and the roof shall be laid from bottom to top in the direction along the water.
3.3.9 At the corner of the roof and at the junction of the roof and the facilities passing through the roof, an additional layer of waterproof cushion should be installed, and waterproof sealing measures should be strengthened.
3.3.10 The following seam sealing measures shall be taken for the prefabricated roof panel.
1 The butt joints of concrete slabs should be filled and compacted with cement mortar or fine stone concrete;
2 The butt joints of light roof panels should be covered with self-adhesive strips.
3.3.11 After each process of construction is completed, it should be inspected and accepted with a complete inspection record, and the construction of the next process can only be carried out after passing the test. During the construction of the next process or adjacent projects, the completed parts should be cleaned and protected.
3.3.12 The construction of sloping roof engineering shall meet the following requirements.
1 Safety guardrails, safety nets or other protective measures to prevent falling must be set up around the roof and the reserved holes;
2 When the roof slope is greater than 30%, anti-slip measures should be taken;
3 Construction personnel should wear safety helmets, safety belts and non-slip shoes;
4 Construction is not allowed in rainy days, snowy days, and winds of Grade 5 and above;
5 Fire-fighting facilities should be set up on the construction site, and fire source management should be strengthened
3.4 Project acceptance
3.4.1 During the construction of the sloping roof project, the items specified in the sub-divisional projects and sub-projects should be checked and accepted, and records should be made.
3.4.2 The completion acceptance of sloping roof works shall be carried out in accordance with relevant regulations.
4 slope roof engineering materials
4.1 Waterproof cushion
4.1.1 The surface of the waterproof cushion should have anti-skid performance or take anti-skid measures.
4.1.2 The waterproof cushion should use the following materials.
1 Asphalt waterproof cushion (self-adhesive polymer asphalt waterproof cushion, polymer modified asphalt waterproof cushion, corrugated asphalt ventilated waterproof cushion, etc.);
2 Polymer waterproof cushion (aluminum foil composite thermal insulation waterproof cushion, plastic waterproof cushion, vapor permeable waterproof cushion and polyethylene polypropylene fiber waterproof cushion, etc.);
3 waterproof membrane and waterproof coating.
4.1.3 For asphalt tile roofs, block tile roofs and corrugated tile roofs with a waterproof grade of first-grade fortification, the types and minimum thickness of the main waterproof cushion shall meet the requirements in Table 4.1.3.
4.1.4 The self-adhesive polymer bitumen waterproof cushion shall comply with the relevant provisions of JC/T 1068 of the current industry standard "Self-adhesive polymer bitumen waterproof cushion for sloping roofs".
4.1.5 The polymer modified asphalt waterproof cushion shall comply with the relevant provisions of JC/T 1067 of the current industry standard "Polymer Modified Asphalt Waterproof Cushion of Waterproof Materials for Sloping Roofs".
4.1.6 The main properties of the corrugated asphalt ventilation and waterproof cushion should meet the requirements in Table 4.1.6.
4.1.7 The main properties of the aluminum foil composite thermal insulation and waterproof cushion should meet the requirements in Table 4.1.7.
4.1.8 The thickness and main performance of the polyethylene polypropylene fiber waterproof cushion should meet the requirements in Table 4.1.8-1.The main properties of the polymer cement waterproof adhesive material used to bond the polyethylene polypropylene fiber waterproof cushion should meet the requirements in Table 4.1.8-2.
4.1.9 The main properties of the vapor-permeable and waterproof cushion should meet the requirements in Table 4.1.9.
4.1.10 The main properties of the waterproof coiled material and waterproof coating used for the waterproof cushion should meet the requirements of relevant standards; when using polymer waterproof coating, the thickness of the coating film should not be less than 1.5mm;, the thickness of the coating film should not be less than 2.0mm.
4.2 Thermal insulation materials
4.2.1 The thermal insulation materials for sloping roofs can be rigid polystyrene foam insulation board, rigid polyurethane foam insulation board, sprayed rigid polyurethane foam, rock wool, slag wool or glass wool, etc. Bulk thermal insulation materials should not be used.
4.2.2 The variety and thickness of thermal insulation materials should meet the requirements of the heat transfer coefficient of the roof system, and should meet the requirements of the relevant building thermal design codes.
4.2.3 The apparent density of thermal insulation materials should not be greater than 250kg/m3.The prefabricated light-duty slope roof should use light-weight thermal insulation materials, and the apparent density should not be greater than 70kg/m3.
4.2.4 Molded polystyrene foam should comply with the relevant provisions of the current national standard "Molded polystyrene foam for heat insulation" GB/T 10801.1; extruded polystyrene foam should comply with the current national standard Relevant provisions of GB/T 10801.2 of "Extruded Polystyrene Foam Plastics for Thermal Insulation (XPS)".
4.2.5 The rigid polyurethane foam insulation board shall comply with the relevant provisions of the current national standard GB/T 21558 "Rigid Polyurethane Foam Plastics for Building Thermal Insulation".
4.2.6 The main properties of sprayed rigid polyurethane thermal insulation materials shall comply with the relevant provisions of the current national standard "Technical Specifications for Polyurethane Thermal Insulation and Waterproof Engineering" GB 50404.
4.2.7 The insulating glass wool shall comply with the relevant provisions of the current national standard "Glass wool products for building heat insulation" GB/T 17795.
4.2.8 The main properties of rock wool and slag wool thermal insulation materials should meet the provisions of the current national standard GB/T 19686 "Rock wool and slag wool thermal insulation products for construction". When used in mechanical fixing method construction, it shall comply with the relevant provisions in Table 4.2.8.
4.3 Asphalt shingles
4.3.1 The specifications and main performances of asphalt shingles shall comply with the relevant provisions of the current national standard GB/T 20474 "Fiberglass Asphalt Tile".
4.3.2 The specifications and technical performance of accessories used for asphalt tile roofing shall comply with the relevant standards.
4.4 tiles
4.4.1 The main properties of sintered tiles and accessory tiles should comply with the relevant provisions of the current national standard "Sintered tiles" GB/T 21149.
4.4.2 The main properties of concrete tiles and accessory tiles should meet the relevant provisions of the current industry standard "Concrete tiles" JC/T 746.
4.4.3 The specifications and technical performance of the accessories used in the roof structure of sintered tiles and concrete tiles shall comply with the relevant standards.
4.5 Corrugated tiles
4.5.1 The main properties of asphalt corrugated tiles should meet the requirements in Table 4.5.1, and the specifications and dimensions should meet the requirements of relevant standards.
4.5.2 The surface of the corrugated resin tile should be flat, uniform in thickness, free of cracks, cracks, holes, burnt, air bubbles, obvious pitting, and heterochromatic spots, and the main performance should meet the requirements of relevant standards.
4.5.3 The specifications and technical performance of accessories used for corrugated tile roofs shall comply with the relevant standards.
4.6 Metal plate
4.6.1 The specification and main performance of the profiled metal sheet shall comply with the provisions in Table 4.6.1.
4.6.2 For coated metal plates, the coating on the front side shall not be less than two layers, and the coating on the back side shall be one or two layers. With the relevant provisions of "GB/T 12754, the durability of the coating shall meet the provisions of Table 4.6.2.
4.6.3 The main properties of profiled metal plates shall comply with the relevant provisions of the current national standards "Profiled Steel Plates for Construction" GB/T 12755 and "Profiled Plates for Aluminum and Aluminum Alloys" GB/T 6891.The main performance of the board should comply with the relevant provisions of the relevant standards.
4.9.4 Waterproof coatings should meet the requirements of relevant standards.
4.9.5 The flashing materials used in the exposed environment shall have weather resistance.
4.10 Mechanical Fixings
4.10.1 Mechanical fixings mainly include fixing nails, gaskets, sleeves and beading.
4.10.2 Mechanical fasteners should meet the following requirements.
1 The specifications and technical performance of the fixing parts and accessories shall comply with the relevant standards, and shall meet the design service life and safety requirements of the roof waterproof layer;
2 The fixing parts should have anti-corrosion coating;
3 Fixing parts should use screws with anti-loosening thread;
4.The test report of the pull-out force performance of the fixture shall be provided according to the design requirements;
5 When mechanically fixing fibrous thermal insulation materials such as rock wool, the fixing parts with sleeves should be used.
4.10.3 When mechanical fasteners are used in high humidity, high temperature, corrosion and other environments, they shall meet the following requirements.
1 When the indoor humidity is greater than 70%, stainless steel screws should be used;
2 Stainless steel screws should be used in high temperature, chemical corrosion and other environments.
4.10.4 Insulation...
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