What to do if there are cracks in the cast-in-place roof
Cracks in cast-in-place roofs are a common problem in house construction. They not only affect the appearance, but may also cause leakage and structural safety hazards. Recently, there has been a lot of discussion on this topic across the Internet, especially regarding the causes of cracks, repair methods and preventive measures. This article will combine the popular data and structured content of the past 10 days to provide you with detailed solutions.
1. Common types and causes of cast-in-place roof cracks
According to recent search data analysis, cast-in-place roof cracks are mainly divided into the following categories:
| Crack type | Main causes | Appearance time |
|---|---|---|
| shrinkage cracks | Water evaporates too quickly during concrete setting | 1-3 days after construction |
| temperature crack | Temperature changes cause concrete to expand or contract | when seasons change |
| structural cracks | Excessive load or uneven settlement of foundation | after long term use |
| Steel bar rust cracks | Insufficient protective layer of steel bars or moisture | Long term humid environment |
2. Repair method of cast-in-place roof cracks
Differentiated repair measures need to be taken for different crack types. The following are the repair solutions that netizens are most concerned about recently:
| crack width | Fix | Applicable materials | Construction points |
|---|---|---|---|
| ≤0.2mm | surface sealing method | Epoxy resin glue | Apply directly after cleaning cracks |
| 0.2-0.5mm | Pressure grouting | cement based grouting material | Need to drill holes and pressurize injection |
| ≥0.5mm | slot filling method | polymer mortar | It is necessary to cut out the V-shaped groove and then fill it in layers. |
3. Key measures to prevent cast-in-place roof cracks
According to the popular sharing of construction accounts in the past 10 days, you need to pay attention to the following points to prevent cracks:
1.Material selection: Use low-heat cement, control the mud content of sand and gravel to ≤3%, and add polypropylene fiber to improve crack resistance.
2.Construction technology: After the concrete is poured, it is necessary to complete the secondary troweling before the initial setting. After the final setting, cover the curing film in time and keep it moist for at least 7 days.
3.structural design: Set up reasonable expansion joints (recommended spacing ≤ 6m), double-layer two-way reinforcement and protective layer thickness ≥ 20mm.
4. The 5 issues that users are most concerned about (recent hot search data)
| Ranking | question | Search volume share |
|---|---|---|
| 1 | How big are the cracks that require professional repair? | 32.7% |
| 2 | Steps to repair cracks yourself | 25.4% |
| 3 | Crack repair cost standards | 18.9% |
| 4 | Do cracks affect house safety? | 15.2% |
| 5 | Precautions for treating cracks in winter | 7.8% |
5. Professional advice
1.security assessment: When the crack width exceeds 0.3mm or is penetrating, it is recommended to entrust a professional agency to conduct structural inspection.
2.Maintenance time: The optimal repair temperature is 5-35℃, and temporary waterproofing measures must be taken before rain or snow.
3.Warranty period: Formal restoration projects should provide a quality guarantee of at least 2 years, which can be extended to 5 years if branded materials are used.
It can be seen from the above structured data analysis that cracks in cast-in-place roofs require different treatment plans based on specific circumstances. Regular inspections and early intervention are key to preventing small problems from turning into major hazards.
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