A Zhejiang construction project's waterproof membrane material failed re-inspection for seam adhesion strength, prompting the commissioning of a testing agency to trace the root cause. The technical team, using a universal material testing machine, discovered that bonding failure was due to defects in the surface treatment process of the membranes. A testing report was issued in accordance with the GB/T 328 series standards, along with recommendations for optimizing welding parameters. Following on-site corrections, a re-inspection found all materials to be compliant. Customized services cover the entire process from sample collection to rectification and re-inspection, and the company has established long-term partnerships with several renowned real estate developers.