Peeling of the Roof of a Prefabricated Panel House

The peeling of the roof of a prefabricated panel house is mainly caused by leakage and moisture, construction quality, material quality, and building structural issues, requiring targeted repairs.

Leakage and Moisture Issues

The prefabricated panel joint structure has natural gaps that are prone to cracking and forming water infiltration channels due to long-term exposure to temperature differences and settlement. Rainwater or standing water seeps through the cracks, causing the roof surface to become damp, leading to the failure of the adhesive force between the putty powder and the roof surface, and subsequent powdering and peeling. Additionally, leaks from the upper floors, condensation, or excessive indoor humidity can also cause similar problems. Solution: First, identify the source of the leakage, reinforce the panel joints with rigid filling, use specialized joint-filling putty for multiple fillings, and apply tape to enhance adhesion; if the moisture problem is severe, perform moisture-proof treatment, such as applying waterproof latex paint or covering with gypsum board.

Construction Quality Issues

Poor-quality putty powder, excessively thick gypsum leveling layers or putty layers on the roof surface during construction can easily cause cracking and hollowing; poor-quality cement mortar plastering layers on the roof surface, cracking and hollowing phenomena, or the failure to use adhesives during the painting process can also lead to insufficient adhesive force between the putty and the roof surface. Improper base layer treatment (such as failure to clean dust and oil stains) or putty application issues (such as applying too thickly or painting latex paint before drying) can also cause peeling. Solution: Remove the peeled areas, ensure the base layer is dry and level, apply the putty at an appropriate thickness, and allow each layer to dry completely before proceeding with the next application. Avoid working in low-temperature or humid environments.

Material Quality Issues

The use of inferior putty powder or latex paint, or the use of putty instead of gypsum for large-area leveling during construction, resulting in an excessively thick putty layer and excessive self-weight, leading to peeling. Solution: Select high-quality materials that comply with national standards, avoid using putty instead of gypsum for leveling, and strictly control the thickness of the putty layer.

Building Structural Issues

Structural cracks may occur in the prefabricated panel floor due to building settlement, material shrinkage, etc., propagating to the surface plastering and decorative layers, causing cracking and peeling. Additionally, the overall integrity of the prefabricated panel roof is weak, and the dynamic deformation of the panel joints is frequent, causing ordinary waterproof materials to crack and fail, further exacerbating the leakage problem. Solution: For structural cracks, adopt a systematic waterproof renovation plan, including base layer repair, panel joint reinforcement, and full-area protection with national standard roll materials, to provide a long-term solution to the leakage problem. If the cracks are severe, consider installing an integrated ceiling to cover them.