This report summarizes the quality inspection results of the wooden window grids used in the residential log cabin project in suburban green area. The window grids, made of cedar wood (a material widely used in log structure buildings for its moisture resistance), were sampled randomly (sample quantity: 15 sets) for inspection on the 10th day after the completion of batch production. First, the material quality was verified: the wood had no obvious defects such as cracks, worm holes, or decay, and its moisture content was tested to be 12%-15%, which meets the national standard for wooden building components (GB/T 50708-2012《Code for Acceptance of Construction Quality of Timber Structures》).
Next, the manufacturing process and dimensional accuracy were inspected. The window grid frames showed uniform thickness (allowable error ±1mm) and smooth edges with no burrs; the tenon-and-mortise joints between grid bars were tight and free of gaps, and the assembly was firm without looseness. The surface treatment (including fine sanding and two coats of water-based clear varnish) was also checked: the coating was even and consistent, with no bubbles, peeling, or color differences, effectively protecting the wood from moisture and corrosion.
Finally, performance tests (waterproof, sound insulation, and structural stability) were conducted. In the waterproof test, no water seepage was found after 24 hours of simulated rain; the sound insulation performance reached 32dB, meeting the requirements for indoor noise reduction in residential buildings; and in the structural stability test, the window grids remained intact without deformation under a load of 50N. In conclusion, all inspected indicators of the wooden window grids meet the project quality requirements and are qualified for on-site installation.
