How to Repair Leaks in Prefabricated Houses

The repair of leaks in prefabricated houses requires targeted measures based on the specific location and cause of the leak. Common situations and repair methods are as follows:

Leaks caused by roof cracking

If the leak is caused by roof cracking, follow these steps for repair:

1. Clean the gap: Use a chisel to create a groove about 1-2 centimeters deep at the crack. Remove loose cement blocks, dust, and debris from the surface to ensure proper adhesion of the repair material to the base layer.
2. Prepare foam paste: Take white foam (such as polystyrene foam), cut it into thin slices with a knife, and dissolve it in a disposable cup containing a small amount of gasoline. After the foam is completely dissolved, stir it with a hand drill to form a uniform paste as the filling material.
3. Mix epoxy resin compound: Take another disposable cup, pour in black epoxy resin liquid (choose a waterproof-specific model) and an appropriate amount of gasoline, stir well, then add gray cement and stir again until it forms a viscous mixture without particles. The epoxy resin provides waterproofing properties, and the cement enhances structural strength.
4. Repair in layers: First, fill the foam paste into the bottom of the crack and press it firmly to fill the deep voids. After it has initially cured, cover it with the epoxy resin cement mixture and smooth the surface with a scraper to ensure it is level with the surrounding roof. Keep the repaired area dry for more than 24 hours after repair.

Leaks in the seams of prefabricated panel roofs

The key to leaks in prefabricated panel roofs lies in the treatment of panel joints. Traditional methods require chiseling open the joints, cleaning them, and then filling them with waterproof mortar or asphalt. However, these methods are complex to construct and can easily damage the structure. New technologies are recommended:

• CPC leak-proof agent: Directly spray it onto the surface of the panel joints. Its nanomolecules can penetrate the gaps and cure to form a dense waterproof layer without removing the original structure, offering high construction efficiency and durability.
• Polyurethane waterproof coating: Use a high-pressure spray gun to evenly spray a two-component polyurethane coating onto the joints, forming an elastic waterproof membrane that can adapt to small deformations in the panel joints and prevent recurrent leaks.

Precautions:

• Thoroughly dry the leaking area before repair to avoid moisture affecting material adhesion.
• Mix the epoxy resin compound in the correct proportions. Excessive gasoline can lead to poor curing.
• After repairing the prefabricated panel roof, it is advisable to conduct regular inspections, especially at the joints. If cracks are found, promptly apply a waterproof agent.
• If the roof is severely aged or has numerous cracks, consider a complete renovation of the waterproof layer (such as laying SBS modified asphalt membrane).