Changge Prefabricated Roof House Renovation

When renovating prefabricated roof houses in Changge, it is essential to focus on structural safety assessments and targeted renovation measures, prioritizing the resolution of insufficient load-bearing capacity and water leakage issues, and replacing them with cast-in-place roofs or new roofing materials if necessary.

I. Core Characteristics and Potential Risks of Prefabricated Roof Houses

Prefabricated roof houses use prefabricated panels as the roof structure, offering advantages such as low cost and short construction periods, and have been widely used in rural self-built houses. However, they have two major drawbacks:

1. Poor waterproofing: There are gaps between the prefabricated panels, which are prone to roof leakage due to long-term rainwater erosion, especially in Changge where the rainy season is relatively long, making the leakage problem more prominent.
2. Weak load-bearing capacity: The design load of prefabricated panels is limited. If additions such as suspended ceilings, partition walls, or heavy objects are made during renovation, it may lead to floor cracking or even structural instability.

II. Key Assessment Steps Before Renovation

1. Structural safety inspection:
   • Commission a professional agency to conduct load tests on the prefabricated panels to confirm whether their remaining load-bearing capacity meets the renovation requirements.
   • Check the gaps between panels, floor cracks, and steel bar corrosion to assess the level of water leakage risk.
2. Renovation demand matching analysis:
   • If only simple renovation is needed (such as replacing roof tiles), ensure that the additional load does not exceed the original design value.
   • If structural modifications are involved (such as adding mezzanines or suspended ceilings), a new reinforcement plan or roof replacement plan needs to be designed.

III. Targeted Renovation Plans

1. Resolving water leakage issues:
   • Local repair: Use high-pressure grouting to seal the gaps between panels and apply waterproof coatings on the surface.
   • Overall renovation: Refer to the house renovation experience in Changge and replace the original roofing materials with cement tiles or resin tiles, which are durable and lightweight, reducing the pressure on the prefabricated panels.
2. Enhancing load-bearing capacity:
   • Reinforcement treatment: Add steel beams or concrete secondary beams below the prefabricated panels to distribute the load to the load-bearing walls.
   • Alternative plan: If the budget allows, replace the prefabricated roof with a cast-in-place reinforced concrete roof, which has significantly better integrity, seismic resistance, and water permeability than prefabricated panels. However, the construction period will be extended by about 1-2 months, and the cost will increase by 30%-50%.

IV. Renovation Taboos and Precautions

• Prohibit unauthorized load increases: Avoid stacking debris on the roof, installing heavy solar equipment, or conducting large-scale suspended ceiling work.
• Avoid structural damage: Do not arbitrarily remove prefabricated panels or load-bearing walls during renovation, and retain the original drainage slope to prevent water accumulation.
• Compliant construction: Choose a qualified construction team to ensure that the renovation complies with the "Unified Standard for Civil Building Design" and local building codes in Changge.