We split what we buy the way it actually gets specified and inspected. A modular unit and a waterproof membrane fail for completely different reasons, so they are not shelved together. Here is the logic — and the seven lines inside it.
Judged as a module, not as a material.
These arrive on site complete. What decides whether they pass is dimensional tolerance, joint detail, and whether the services — water, waste, power — line up with the drawings. The factory is a production line, not a workshop, and the acceptance criteria are written before the first unit is built.
Judged by performance data — and by whether the paper matches the goods.
Membranes, boards, insulation, hardware. Each is bought against a stated grade, a stated standard and a stated service condition. The recurring failure is not a bad product; it is a genuine certificate that describes a different model, a different year, or a different factory.
Judged by species, moisture and joinery — things a photo cannot show.
Solid timber moves. It moves differently in Guangzhou than in Rotterdam, and it moves most in the first heating season. Cases, frames and panels are accepted on moisture content and construction detail, then on finish.
Every line below is one we have walked the floor of. If your product sits outside them, we will say so in the first reply rather than learn on your order.
Flat-pack and container-based units, site offices, modular accommodation. Wall, roof and floor cassettes made to a drawing, with the service penetrations agreed before production.
Open this line → 01.2SMC and panelled bathroom modules, floorless or with a pre-formed tray. Dimensions, waste positions and tile layout are fixed on the first pod, then repeated exactly.
Open this line →Low-VOC boards, certified panels, interior surfaces, recycled-content finishes. The certificate model must match the purchase order — one line decides whether green building acceptance passes.
Open this line → 02.2Membranes, coatings and sealants, selected on the real service condition — buried, exposed, wet-room or roof — and verified against the batch actually shipped.
Open this line → 02.3XPS, EPS, rock wool, PIR and facing systems. Density, compressive strength and fire class are specified together, because a board that hits one and misses another is the usual problem.
Open this line → 02.4Hinges, handles, locks and structural fixings. When the price does not match the claimed grade, the mill certificate arrives before the goods do.
Open this line →No quote is meaningful until the finish, the grade, the tolerance and the test standard are written down. We write that down first — then ask for prices.
Once approved, the sample is sealed and referenced in the order. Production is measured against it, not against "similar".
Inspection happens while your money is still in your account. Leverage after payment is imaginary.
Shortages, damage, next-year reorders — the relationship is judged by what happens in month thirteen, not week two.
我们怎么分，按的是这些东西实际怎么被指定、怎么被验收。一个模块化单元和一张防水卷材，出事的原因完全不一样，所以不会摆在同一格货架上。下面是这条逻辑，和里面的七条线。
按模块验收，不按材料验收。
这类东西到工地就是完整的。决定它过不过的，是尺寸公差、拼缝节点，以及水、排水、电的点位跟图纸对不对得上。做它的厂是产线，不是作坊；验收标准在第一台做出来之前就写好了。
按性能数据验收——还要看那张纸跟货对不对得上。
卷材、板材、保温、五金。每一样都按说定的等级、说定的标准、说定的使用条件买。最常见的坑不是产品差，是一张真证书，写的是另一个型号、另一个年份，或者另一家厂。
按木种、含水率和榫卯验收——这些照片看不出来。
实木会动。在广州动的方式和在鹿特丹不一样，动得最厉害的是第一个采暖季。柜体、框架、门板先看含水率和构造做法，然后才看饰面。
下面每一条，都是我们亲自在车间里走过的。您的产品如果在这些之外，我们第一封回信就直说，不拿您的单子去学。
打包式与集装箱式单元、工地办公、模块化宿舍。墙、顶、地做成板块，按图生产，管线开孔在投产前就定死。
看这一条 → 01.2SMC 与板拼式卫浴模块，带底盘或不带底盘。尺寸、排水点位、瓷砖排布在第一台就定死，之后每一台一模一样。
看这一条 →低 VOC 板材、有认证的墙板、内饰面、含再生料的饰面。证书上的型号必须和订单对得上——这一行字决定绿色建筑验收过不过。
看这一条 → 02.2卷材、涂料、密封胶，按真实使用条件选——埋土、外露、湿区还是屋面——再对着实际发走的那一批货核实。
看这一条 → 02.3XPS、EPS、岩棉、PIR 与饰面系统。密度、抗压、防火等级要一起定，因为「达标了一项、差了另一项」才是常态。
看这一条 → 02.4合页、执手、锁具、结构紧固件。价格和宣称的等级对不上，就先要材质书——货到之前就要。
看这一条 →饰面、等级、公差、检测标准没写下来之前，任何报价都没有意义。我们先把这些写下来，再去要价格。
确认之后，样品封存，写进订单里。大货对着它量，不对着「差不多」量。
验货发生在您钱还在您账上的时候。付完款之后的筹码，是想象出来的。
短少、破损、明年返单——这段关系看的是第十三个月发生什么，不是第二周。