4.1 General Provisions
4.1.1 This chapter is applicable to the quality acceptance of sub projects such as general plastering, decorative plastering, and plain masonry jointing.
During the acceptance of plastering works, the following documents and records should be checked:
Construction drawings, design specifications, and other design documents for plastering projects.
The product qualification certificate, performance testing report, entry acceptance record, and re inspection report of the two materials.
3. Acceptance records of concealed works.
4 Construction records.
4.1.3 Plastering works should be retested for the setting time and stability of cement.
4.1.4 The plastering project shall be inspected for the following concealed works:
Strengthening measures for plastering with a total thickness greater than or equal to 35mm.
Strengthening measures at the junction of two different material matrices.
4.1.5 The inspection batches of each sub project shall be divided according to the following regulations:
Outdoor plastering projects with the same materials, processes, and construction conditions should be marked as an inspection batch every 500-1000 square meters, and any area less than 500 square meters should also be marked as an inspection batch.
For indoor plastering projects with the same materials, processes, and construction conditions, every 50 natural rooms (large rooms and corridors with a plastering area of 30 m2 per room) should be divided into one inspection lot, and any room less than 50 should also be divided into one inspection lot.
Explanation:
4.1.5 According to the provisions of the Unified Standard for Construction Quality Acceptance of Building Engineering (GB50300-2001) on the division of inspection batches and the characteristics of decoration and renovation projects, the original standard shall be modified. Outdoor plastering is generally a continuous operation of the upper and lower layers, with a complete decorative surface between the two layers and no boundaries between layers. If inspection batches are divided by floor, it is not easy to inspect. On the other hand, the volume and floor height of each building are not consistent, and even for the same building, the floor height is not completely consistent, making it difficult to determine the concept of dividing inspection batches by floor. Therefore, it is stipulated that outdoor areas are divided into inspection batches every 500-1000m2 according to the same materials, processes, and construction conditions.
4.1.6 The inspection quantity shall comply with the following regulations:
At least 10% of each inspection batch indoors should be randomly sampled, and no less than 3 rooms should be inspected; When there are less than 3 rooms, all should be inspected.
At least one spot should be inspected every 100m2 for each outdoor inspection batch, and each spot should not be less than 10 m2.
Before the construction of the exterior wall plastering project, steel wooden doors, window frames, guardrails, etc. should be installed first, and the construction holes on the wall should be blocked tightly.
The curing period of lime paste used for plastering should not be less than 15 days; the curing period of finely ground lime powder used for coating should not be less than 3 days.
4.1.9 The construction method of the external corners of indoor walls, columns, and door openings should meet the design requirements. When there are no design requirements, 1:2 cement mortar should be used as corner protectors, with a height of not less than 2m and a width of not less than 50mm on each side.
When it is required that the plaster layer has waterproof and moisture-proof functions, waterproof mortar should be used.
4.1.11 Various mortar plastering layers should be protected from quick drying, water flushing, impact, vibration, and freezing before setting, and measures should be taken to prevent contamination and damage after setting. The cement mortar plaster layer should be cured under moist conditions.
4.1.12 The plaster layer of the exterior wall and ceiling must be firmly bonded to the base layer and between each plaster layer.
Explanation:
4.1.12 After investigation, it was found that the quality accidents of plaster layer detachment occur frequently in the plastering of concrete (including precast concrete) ceiling substrates due to various factors, which seriously endanger personal safety and have attracted the attention of relevant departments. For example, in order to solve the quality problem of plaster layer detachment on the surface of concrete ceiling substrates, Beijing requires all construction units not to plaster on the surface of concrete ceiling substrates, and to level it with putty. Over the past 5 years, good results have been achieved.
4.1 General Provisions
4.1.1 This chapter is applicable to the quality acceptance of sub projects such as general plastering, decorative plastering, and plain masonry jointing.
During the acceptance of plastering works, the following documents and records should be checked:
Construction drawings, design specifications, and other design documents for plastering projects.
The product qualification certificate, performance testing report, entry acceptance record, and re inspection report of the two materials.
3. Acceptance records of concealed works.
4 Construction records.
4.1.3 Plastering works should be retested for the setting time and stability of cement.
4.1.4 The plastering project shall be inspected for the following concealed works:
Strengthening measures for plastering with a total thickness greater than or equal to 35mm.
Strengthening measures at the junction of two different material matrices.
4.1.5 The inspection batches of each sub project shall be divided according to the following regulations:
Outdoor plastering projects with the same materials, processes, and construction conditions should be marked as an inspection batch every 500-1000 square meters, and any area less than 500 square meters should also be marked as an inspection batch.
For indoor plastering projects with the same materials, processes, and construction conditions, every 50 natural rooms (large rooms and corridors with a plastering area of 30 m2 per room) should be divided into one inspection lot, and any room less than 50 should also be divided into one inspection lot.
Explanation:
4.1.5 According to the provisions of the Unified Standard for Construction Quality Acceptance of Building Engineering (GB50300-2001) on the division of inspection batches and the characteristics of decoration and renovation projects, the original standard shall be modified. Outdoor plastering is generally a continuous operation of the upper and lower layers, with a complete decorative surface between the two layers and no boundaries between layers. If inspection batches are divided by floor, it is not easy to inspect. On the other hand, the volume and floor height of each building are not consistent, and even for the same building, the floor height is not completely consistent, making it difficult to determine the concept of dividing inspection batches by floor. Therefore, it is stipulated that outdoor areas are divided into inspection batches every 500-1000m2 according to the same materials, processes, and construction conditions.
4.1.6 The inspection quantity shall comply with the following regulations:
At least 10% of each inspection batch indoors should be randomly sampled, and no less than 3 rooms should be inspected; When there are less than 3 rooms, all should be inspected.
At least one spot should be inspected every 100m2 for each outdoor inspection batch, and each spot should not be less than 10 m2.
Before the construction of the exterior wall plastering project, steel wooden doors, window frames, guardrails, etc. should be installed first, and the construction holes on the wall should be blocked tightly.
The curing period of lime paste used for plastering should not be less than 15 days; the curing period of finely ground lime powder used for coating should not be less than 3 days.
4.1.9 The construction method of the external corners of indoor walls, columns, and door openings should meet the design requirements. When there are no design requirements, 1:2 cement mortar should be used as corner protectors, with a height of not less than 2m and a width of not less than 50mm on each side.
When it is required that the plaster layer has waterproof and moisture-proof functions, waterproof mortar should be used.
4.1.11 Various mortar plastering layers should be protected from quick drying, water flushing, impact, vibration, and freezing before setting, and measures should be taken to prevent contamination and damage after setting. The cement mortar plaster layer should be cured under moist conditions.
4.1.12 The plaster layer of the exterior wall and ceiling must be firmly bonded to the base layer and between each plaster layer.
Explanation:
4.1.12 After investigation, it was found that the quality accidents of plaster layer detachment occur frequently in the plastering of concrete (including precast concrete) ceiling substrates due to various factors, which seriously endanger personal safety and have attracted the attention of relevant departments. For example, in order to solve the quality problem of plaster layer detachment on the surface of concrete ceiling substrates, Beijing requires all construction units not to plaster on the surface of concrete ceiling substrates, and to level it with putty. Over the past 5 years, good results have been achieved.
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