GB 50207-2012 English PDF

GB 50207: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB 50207-2012	RFQ	ASK	3 days	Code for acceptance of construction quality of roof	Valid
GB 50207-2002	RFQ	ASK	14 days	Code for acceptance of construction quality of roof	Obsolete
GB 50207-1994	RFQ	ASK	3 days	Technical code for roof engineering	Obsolete

Similar standards

GB 50209 GB 50108 GB 50877 GB 50210 GB 50212 GB 50209

Basic data

Standard ID: GB 50207-2012 (GB50207-2012)
Description (Translated English): Code for acceptance of construction quality of roof
Sector / Industry: National Standard
Classification of Chinese Standard: P32
Word Count Estimation: 130,162
Older Standard (superseded by this standard): GB 50207-2002
Quoted Standard: GB 50204; GB 50205; GB 50206; GB 50209; GB 50300; GB 50345; GB 50411; JG/T 231
Regulation (derived from): Bulletin of the Ministry of Housing and Urban No. 1394
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 building construction roofing project quality inspection.

GB 50207-2012: Code for acceptance of construction quality of roof

---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 strengthen the quality management of building roofing projects, unify the quality inspection of roofing projects, and ensure their function and quality, this specification is formulated. 1.0.2 This specification is applicable to the quality inspection of building roofing works. 1.0.3 The design and construction of the roofing project shall comply with the relevant provisions of the current national standard "Technical Specifications for Roofing Engineering" GB 50345. 1.0.4 The construction of the roof project shall comply with the relevant national regulations on environmental protection, building energy conservation and fire safety. 1.0.5 The quality acceptance of the roofing project shall not only comply with this specification, but also comply with the current relevant national standards. 2 terms 2.0.1 vapor barrier vapor barrier The construction layer that prevents indoor water vapor from penetrating into the insulation layer. 2.0.2 thermal insulation layer A structural layer that reduces the heat exchange effect of the roof. 2.0.3 waterproof layer waterproof layer A layer of construction that is capable of preventing water from penetrating into the interior of a building. 2.0.4 isolation layer isolation layer A structural layer that eliminates adverse effects such as bonding force, mechanical interlocking force, and chemical reaction between two adjacent materials. 2.0.5 protection layer protection layer The construction layer that protects the waterproof layer or insulation layer. 2.0.6 insulation layer A structural layer that reduces the transfer of solar radiant heat to the interior. 2.0.7 Composite waterproof layer compound waterproof layer A waterproofing layer composed of a combination of compatible membranes and coatings. 2.0.8 additional layer additional layer Coiled material or coating film reinforcement layer arranged on the parts prone to leakage and damage. 2.0.9 bushing surface The outermost layer of the roof is paved with block tiles or asphalt tiles, which is a structural layer with waterproof and decorative functions. 2.0.10 board running surface The outermost layer of the roof is covered with metal plates or glass plates, which have waterproof and decorative functions. 2.0.11 Waterproof cushion layer waterproof leveling layer Set under tiles or metal plates, it is a structural layer that acts as a waterproof and moisture-proof function. 2.0.12 nail-supporting layer Tile roof construction layer that can hold nails. 2.0.13 Fiber material fiber material It is a plate-shaped or felt-shaped fiber product made by melting molten rock, slag, glass and other raw materials at high temperature and adopting centrifugal method or gas injection method. 2.0.14 Spraying polyurethane foam With isocyanate and polyol as the main raw materials, foaming agent and other additives are added, and special spraying equipment is used on site to continuously spray foaming polyurethane on the base layer for multiple times to form a seamless rigid foam. 2.0.15 cast foam concrete The aqueous solution of foaming agent is prepared into foam by physical method, and then the foam is added to the slurry made of cement, aggregate, admixture, admixture and water, etc., and it is formed by mixing, on-site pouring and natural curing lightweight porous concrete. 2.0.16 glass lighting roof A roof composed of glass light-transmitting panels and a support system. 3 Basic Regulations 4.1.2 The construction of the roof concrete structure layer shall comply with the relevant provisions of the current national standard "Code for Construction Quality Acceptance of Concrete Structure Engineering" GB 50204. 4.1.3 Roof slope finding should meet the design drainage slope requirements, structural slope finding should not be less than 3%, material slope finding should be 2%;.200mm. 4.1.4 The protection and pavement construction of the upper roof or other functional roofs shall not only comply with the provisions of this chapter, but also comply with the relevant provisions of the current national standard "Code for Construction Quality Acceptance of Building Ground Engineering" GB 50209 and so on. 4.1.5 The number of random inspections for each inspection batch of each sub-item of the grassroots and protection works shall be based on the roof area of 100m2, and each location shall be 10m2, and shall not be less than 3 locations. 4.2 Slope layer and leveling layer 4.2.1 The slab joint filling construction of prefabricated reinforced concrete slabs shall meet the following requirements. 1 When filling concrete, the inside of the slab gap should be cleaned and kept moist; 2 When the width of the slab seam is greater than 40mm or narrow at the top and wide at the bottom, steel bars shall be arranged in the slab seam according to the design requirements; 3 The strength grade of the concrete embedded with fine stone should not be lower than C20, the embedded depth should be 10mm-20mm lower than the slab surface, and it should be compacted by vibrating and watered for curing; 4 Anti-crack construction measures shall be added to the plate end joints according to the design requirements. 4.2.2 Lightweight aggregate concrete should be used for the slope finding layer; the slope finding material should be laid in layers and compacted properly, and the surface should be flat. 4.2.3 Cement mortar or fine stone concrete should be used for the leveling layer; the smoothing process of the leveling layer should be completed before the initial setting, and the calendering process should be completed before the final setting, and maintenance should be carried out after the final setting. 4.2.4 The vertical and horizontal spacing of the grid joints in the leveling layer should not be greater than 6m, and the width of the grid joints should be 5mm to 20mm. Ⅰ Master Control Item 4.2.5 The quality and mix ratio of the materials used for the slope layer and the leveling layer shall meet the design requirements. Inspection method. check the factory certificate, quality inspection report and measurement measures. 4.2.6 The drainage slope of the slope layer and the leveling layer shall meet the design requirements. Inspection method. Slope ruler inspection. Ⅱ General Items 4.2.7 The leveling layer should be smoothed and calendered, and there should be no looseness, sanding or peeling. Inspection method. observation inspection. 4.2.8 At the junction of the base layer of the membrane waterproof layer and the protruding roof structure, as well as the corner of the base layer, the leveling layer should be made into a circular arc shape, and it should be neat and smooth. Inspection method. observation inspection. 4.2.9 The width and spacing of the leveling layer grid joints shall meet the design requirements. Inspection method. observation and ruler inspection. 4.2.10 The allowable deviation of the surface flatness of the slope layer is 7mm, and the allowable deviation of the surface smoothness of the leveling layer is 5mm. Inspection method. 2m inspection with ruler and feeler gauge. 4.3 Vapor barrier 4.3.1 The base layer of the vapor barrier should be flat, clean and dry. 4.3.2 The vapor barrier layer should be set between the structural layer and the insulation layer; the vapor barrier layer should be made of materials with good air and water tightness. 4.3.3 At the connection between the roof and the wall, the vapor barrier layer should be laid continuously upward along the wall, and the upper surface of the insulation layer should not be less than 150mm. 4.3.4 When the vapor barrier layer is made of coiled material, it should be laid empty, and the lap joints of the coiled material should be fully glued, and the lap width should not be less than 80mm; when the vapor barrier layer is made of paint, it should be painted evenly. 4.3.5 The surroundings of the pipeline passing through the vapor barrier should be sealed tightly, and there should be no breakage at the corners; any defective or damaged parts of the vapor barrier should be repaired. Ⅰ Master Control Item 4.3.6 The quality of the material used for the vapor barrier should meet the design requirements. Inspection method. check the factory certificate, quality inspection report and entry inspection report. 4.3.7 The vapor barrier must not be damaged. Inspection method. observation inspection. Ⅱ General Items 4.3.8 The vapor barrier layer of the coiled material should be laid flat, the overlapping joints of the coiled material should be firmly bonded, the seal should be tight, and there should be no defects such as twisting, wrinkling and blistering. Inspection method. observation inspection. 4.3.9 The vapor barrier layer of the coating film should be firmly bonded, the surface should be smooth, the coating should be uniform, and there should be no defects such as accumulation, foaming and exposed bottom. Inspection method. observation inspection. 4.4 Isolation layer 4.4.1 An isolation layer should be set between the protective layer of block material, cement mortar or fine stone concrete and the waterproof layer of coiled material and coating film. 4.4.2 The isolation layer can be dry-laid plastic film, geotextile, coiled material or low-strength grade mortar. Ⅰ Master Control Item 4.4.3 The quality and mix ratio of materials used for the isolation layer shall meet the design requirements. Inspection method. check the factory certificate and measurement measures. 4.4.4 The isolation layer must not be damaged or missed. Inspection method. observation inspection. Ⅱ General Items 4.4.5 The plastic film, geotextile, and coiled material should be laid flat, and the overlapping width should not be less than 50mm, and there should be no wrinkles. Inspection method. observation and ruler inspection. 4.4.6 The surface of the low-strength mortar should be compacted and smooth, without shelling or sanding. Inspection method. observation inspection. 4.5 Protective layers 4.5.1 The construction of the protective layer on the waterproof layer should be carried out after the coiled material is laid and pasted or the paint is cured and formed into a film, and it is passed the inspection. 4.5.2 When block materials are used as the protective layer, it is advisable to set the grid joints, the vertical and horizontal spacing of the grid joints should not be greater than 10m, and the width of the grid joints should be 20mm. 4.5.3 When cement mortar is used as the protective layer, the surface should be flattened and calendered, and surface divisions should be arranged. The division area should be 1m2. 4.5.4 When fine stone concrete is used as the protective layer, the concrete should be vibrated and compacted, the surface should be smoothed and calendered, and the vertical and horizontal spacing of the grid joints should not be greater than 6m. The width of the grid seam should be 10mm to 20mm. 4.5.5 A gap with a width of 30 mm should be reserved between the block material, cement mortar or fine stone concrete protective layer and the parapet and gable wall. The gap should be filled with polystyrene foam, and the sealing material should be embedded and compacted. Ⅰ Master Control Item 4.5.6 The quality and mix ratio of materials used for the protective layer shall meet the design requirements. Inspection method. check the factory certificate, quality inspection report and measurement measures. 4.5.7 The strength grade of block material, cement mortar or fine stone concrete protective layer shall meet the design requirements. Inspection method. check the block material, cement mortar or concrete compressive strength test report. 4.5.8 The drainage slope of the protective layer shall meet the design requirements. Inspection method. Slope ruler inspection. Ⅱ General Items 4.5.9 The surface of the block material protective layer should be clean, the joints should be smooth, the periphery should be straight, the inlay should be correct, and there should be no hollowing. Inspection method. tap with a small hammer and observe. 4.5.10 The protective layer of cement mortar and fine stone concrete shall not have cracks, peeling, pitting and sanding. Inspection method. observation inspection. 4.5.11 The light-colored paint should be firmly bonded to the waterproof layer, and the thickness should be uniform without missing paint. Inspection method. observation inspection. 4.5.12 The allowable deviation and inspection method of the protective layer shall comply with the provisions in Table 4.5.12.

5 Thermal insulation and thermal insulation engineering

5.1 General provisions 5.1.1 This chapter is applicable to the construction quality acceptance of plank materials, fiber materials, sprayed rigid polyurethane foam, cast-in-place foam concrete insulation layers, and planting, overhead, and water storage insulation layers. 5.1.2 The base layer for laying the insulation layer should be flat, dry and clean. 5.1.3 During the construction of thermal insulation materials, moisture-proof, water-proof and fire-proof measures should be taken. 5.1.4 The structure and selection of materials for thermal insulation and heat insulation works shall meet the design requirements. 5.1.5 In addition to complying with the provisions of this chapter, the quality acceptance of thermal insulation and heat insulation projects shall also comply with the relevant provisions of the current national standard "Code for Construction Quality Acceptance of Building Energy Conservation Engineering" GB 50411. 5.1.6 The moisture content of the thermal insulation material should be equivalent to the equilibrium moisture content of the material in the local natural air-dried state. 5.1.7 The thermal conductivity, apparent density or dry density, compressive strength or compressive strength, and combustion performance of insulation materials must meet the design requirements 5.1.8 Before the construction of the planting, overhead and water storage insulation layers, the waterproof layer should be checked and accepted. 5.1.9 The number of random inspections for each inspection batch of each sub-item of thermal insulation and heat insulation engineering shall be 1 location per 100m2 of roof area, each location shall be 10m2, and shall not be less than 3 locations. 5.2 Insulation layer of plate material 5.2.1 When the thermal insulation layer of plank material is constructed by dry laying method, the plank thermal insulation material should be close to the surface of the base layer, and it should be laid flat and stable; The chips of the same material are used for compact filling. 5.2.2 When the thermal insulation layer of plate-shaped materials is constructed by pasting, the adhesive should be compatible with the material properties of the thermal insulation material, and should be tightly pasted and adhered firmly; Adhesive is applied to the side of the plate, and the gap exceeding 2mm should be filled tightly with lath or sheet of the same material. 5.2.3 When the plate-shaped insulation material is constructed by mechanical fixing method, special screws and gaskets should be selected; the connection between the fixing parts and the structural layer should be firm. Ⅰ Master Control Item 5.2.4 The quality of plate-shaped insulation materials shall meet the design requirements. Inspection method. check the factory certificate, quality inspection report and entry inspection report. 5.2.5 The thickness of the thermal insulation layer of plate-shaped materials shall meet the design requirements, and its positive deviation shall not be limited, and its negative deviation shall be 5%, and shall not be greater than 4mm. Inspection method. steel needle insertion and ruler inspection. 5.2.6 The treatment of the roof heat bridge should meet the design requirements. Inspection method. observation inspection. Ⅱ General Items 5.2.7 The laying of plate-shaped thermal insulation materials should be close to the base, should be laid flat and stable, the joints should be tight, and the paste should be firm. Inspection method. observation inspection. 5.2.8 The specification, quantity and position of the fixing parts shall meet the design requirements; the gasket shall be flush with the surface of the insulation layer. Inspection method. observation inspection. 5.2.9 The allowable deviation of the flatness of the surface of the thermal insulation layer of plate materials is 5mm. Inspection method. 2m inspection with ruler and feeler gauge. 5.2.10 The allowable deviation of the seam height difference of the thermal insulation layer of plate materials is 2mm. Inspection method. ruler and feeler gauge inspection. 5.3 Fibrous insulation layer 5.3.1 The construction of fiber material insulation layer shall meet the following requirements. 1 The fiber insulation material should be close to the surface of the base layer, the plane joints should be squeezed tightly, and the joints of the upper and lower layers should be staggered from each other; 2 When the roof slope is relatively large, it is advisable to use metal or plastic special fixing parts to fix the fiber insulation material and the base; 3 After the fiber material is filled, no one can step on it. 5.3.2 When constructing prefabricated skeleton fiber thermal insulation materials, thermal insulation keels or metal keels should be laid on the base layer first, fiber thermal insulation materials should be filled between the keels, and cement fiberboards should be nailed on the keels. The metal keel and fixing parts should be treated with anti-rust, and the measures of heat insulation and bridge breaking should be taken between the metal keel and the base. Ⅰ Master Control Item 5.3.3 The quality of fiber insulation materials should meet the design requirements. Inspection method. check the factory certificate, quality inspection report and entry inspection report. 5.3.4 The thickness of the fiber material insulation layer should meet the design requirements, the positive deviation should not be limited, the felt must not have negative deviation, the board negative deviation should be 4%, and should not be greater than 3mm. Inspection method. steel needle insertion and ruler inspection. 5.3.5 The treatment of the roof heat bridge should meet the design requirements. Inspection method. observation inspection. Ⅱ General Items 5.3.6 The laying of fiber insulation materials should be close to the base, the seams should be tight, and the surface should be smooth. Inspection method. observation inspection. 5.3.7 The specification, quantity and position of the fixing parts shall meet the design requirements; the gasket shall be flush with the surface of the insulation layer. Inspection method. observation inspection. 5.3.8 The prefabricated frame and cement fiber board should be nailed firmly and the surface should be flat; the distance between keels and the thickness of the board should meet the design requirements. Inspection method. observation and ruler inspection. 5.3.9 For glass wool products with water vapor penetration-resistant outer cladding, the outer cladding should face indoors, and the joints should be sealed tightly with waterproof sealing tape. Inspection method. observation inspection. 5.4 Spraying rigid polyurethane foam insulation layer 5.4.1 Before the construction of the insulation layer, the spraying equipment should be debugged, and samples should be prepared for performance testing of rigi......

Image

Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB 50207-2012_English be delivered?

Answer: Upon your order, we will start to translate GB 50207-2012_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of GB 50207-2012_English with my colleagues?

Answer: Yes. The purchased PDF of GB 50207-2012_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Question 3: Does the price include tax/VAT?

Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.

Question 5: Should I purchase the latest version GB 50207-2012?

Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB 50207-2012 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.