This paper attempts to summarize the impact of the cost increment of waterproofing works on the overall cost index of the project through the comparison and analysis of the changes between the General Waterproof Code and the relevant old codes.
2849 roof samples were sampled, and the leakage rate was 95.33%; 1777 samples of underground buildings were sampled and surveyed, with a leakage rate of 57.51%; A sample of 3674 households were surveyed, with a leakage rate of 37.48%.
Key words: waterproof; General specification for waterproofing of building and municipal engineering; Introduction to Cost Increment On October 24, 2022, the Ministry of Housing and Urban-Rural Development issued the General Code for Waterproofing of Building and Municipal Engineering (GB55030-2022) (hereinafter referred to as the General Code for Waterproofing), which was officially implemented on April 1, 2023, and since then the first mandatory waterproof code in China has been officially implemented.
The use of SBS modified asphalt waterproofing materials is strictly restricted.
More than 80000 copies of cost management hot books have been sold — click the above figure to view the details of 224 real estate management documents, click to view the collection of cost people’s ability improvement, click to view the summary: In order to further standardize the market and ensure the quality of waterproof works, on October 24, 2022, the Ministry of Housing and Urban-Rural Development issued the General Specification for Waterproofing of Building and Municipal Engineering (GB55030-2022), Based on the basic principle of “adjusting measures to local conditions, giving priority to prevention, combining prevention and drainage, and comprehensive treatment”, the General Rules for Waterproofing has made more strict regulations in many aspects, such as the working life of waterproof design, waterproof materials, engineering grade definition, and waterproof layers.
129), All government-invested projects should use polymer waterproofing materials, and other projects should give priority to polymer waterproofing materials.
The waterproof design service life of the inner wall of non-corrosive cut-off water storage works shall not be less than 10 years”.
According to the data of the 2013 National Building Leakage Survey Project Report, the sampling survey involves 28 large and medium-sized cities and 850 communities in the country.
The waterproof design service life of indoor works shall not be less than 25 years; 5.
It aims to improve the quality of waterproof works by improving the waterproof life, redefining the waterproof grade, improving the durability requirements of waterproof materials, and increasing the number of waterproof courses to specify the minimum thickness of materials.
The full text is a mandatory engineering construction specification.
2.
A total of 2849 buildings were surveyed and 3674 households were interviewed.
Class II waterproof is Class A+Class III; Class B+II; Class C+Class I; In the old regulations, the roof waterproofing requirements for general buildings are Class II waterproofing, and the general underground waterproofing is Class II waterproofing.
Through comparison, it can be seen that the design service life of the roof works, regardless of the level I and level II waterproofing, is 20 years.
The building leakage problem is very serious, which will not only affect people’s living quality, but also threaten the building safety.
The General Specification for Waterproofing was conceived under this background and has a milestone significance.
The indoor works and the water storage works are clearly proposed for the first time that the design service life should not be less than 25 years and not less than 10 years.
The improvement and clarification of the design service life of waterproof works have made more stringent requirements on the quality and durability of waterproof materials, such as “the thermal aging test of asphalt materials shall not be less than 70 ℃” specified in the General Specification × The thermal aging test of polymer materials shall be conducted under the condition of 14 days at least 80 ℃ × 14d “, according to the provisions of Elastomer Modified Asphalt Waterproof Sheet (GB18242-2008) and Pre-paved Waterproof Sheet (GB/T23457-2017), the thermal aging test of asphalt materials shall be conducted at (80 ± 2) ℃ × 10d ± 1h, the thermal aging test of polymer materials shall be conducted at (80 ± 2) ℃ × (168 ± 2) h, the extension of thermal aging days will match the improvement of the design service life of the General Specifications, and the low-end and low-quality waterproof products will be phased out.
Waterproof grade change The waterproof grade is determined from two dimensions in the General Waterproof Code: building engineering classification and waterproof environment classification.
At the same time, we should also see that the improvement of waterproof engineering quality brought by the General Waterproof Code will cause a significant increase in the cost of waterproof engineering.
Table of Contents 01 Changes in the General Waterproof Regulations compared with the old ones 02 Impact of changes in the new and old specifications on costs 01 Changes in the General Waterproof Regulations compared with the old ones/management sharing summary 1.
At the same time, in combination with the provisions of the Chengdu Municipal Housing and Urban-Rural Development Bureau and the Planning and Natural Resources Bureau jointly issued the “Chengdu Municipal Technical Management Regulations for Newly-built Commercial Residential Buildings (First Edition)” (CSJF [2021] No.
If the price of polymer waterproof coiled materials is about twice that of asphalt coiled materials, it can be predicted that the change of material selection will cause the increase of waterproof engineering cost.
Increase in the working life of waterproof design The General Waterproof Regulations have significantly improved the requirements for the working life of waterproof design involving housing construction projects.
It is urgent to improve the quality of waterproof works of housing construction projects.
The improvement of waterproof grade has brought about changes in building practices, such as increasing the number of waterproof layers and increasing the cost accordingly.
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The changes are reflected in Section 2.0.2, “2.
In the long run, polymer waterproof materials and water-based waterproof coatings with environmental protection advantages will become the mainstream of the market.
The waterproof design service life of roof works shall not be less than 20 years; 3.
Under this provision, Class I waterproofing is Class A+Class I and Class II; Class B+Class I.
This paper summarizes the impact of the cost increment of building waterproofing on the project cost through the analysis of the cost change caused by the comparison between the General Waterproof Code and the relevant old regulations.
Comparison of design working years (as shown in Table 1).
The General Waterproof Code classifies all civil buildings as Grade I waterproof fortification, and all underground works in civil buildings adopt Grade I waterproof fortification.