Delamination is a common issue with film-faced plywood in construction, which not only affects construction quality but also significantly shortens service life. Based on industry cases and the experience of Langfang Dadi Wood Industry's technical team, the core problems mainly focus on two dimensions: construction environment and installation technology. Below are specific troubleshooting and solution methods.
In terms of the construction environment, humidity and temperature are key influencing factors. When the environmental humidity exceeds 75% or the temperature is lower than 5℃, the bonding strength between the film and the base material will decrease significantly, making delamination likely. During rainy season construction, on-site ventilation and dehumidification should be well managed to avoid prolonged exposure of plywood to rain. For winter construction, heating measures can be adopted to ensure the construction environment temperature is above 10℃. In addition, the presence of corrosive gases or oil stains in the construction area can also damage the bonding layer, requiring advance protective measures.
Improper installation technology is the main human factor causing delamination. Firstly, if the gaps between spliced boards are too large, cement slurry will seep into the interlayer during pouring, leading to separation of the film and base material. It is necessary to ensure the splicing gap of board joints is ≤2mm. Secondly, unreasonable fixing methods-such as excessive nail spacing or overly deep nailing-will damage the bonding structure between the film layer and base material. It is recommended that the nail spacing be controlled at 15-20cm, with nail heads slightly lower than the board surface. Finally, failure to apply release agent as required or using low-quality release agent can cause adhesion and delamination; special release agents compatible with the film material should be selected.
During troubleshooting, the cause can be judged by the delamination location: edge delamination is mostly due to excessive environmental humidity, while local delamination on the board surface may result from uneven force during installation or improper use of release agent. Targeted optimization of construction environment parameters and installation processes, combined with high-quality film-faced plywood that meets ASTM standards, can effectively reduce the probability of delamination and ensure project quality.