Written for the people who have to sign off the specification. No product pitching — just the things that go wrong, and how to prevent them. 写给最终要签字的那个人。不做产品推销，只讲容易出问题的地方，以及怎么避免。
The honest comparison — including the cases where composite is genuinely the better answer. Covers rigidity, fire performance, formability and whole-life cost.客观对比，包括复合板确实更合适的那些场景。涵盖刚度、防火、成型性与全生命周期成本。
Resin content, Florida exposure data and realistic service life by climate zone — so you can decide whether 2605 is worth the premium on your project.树脂含量、佛罗里达曝晒数据以及按气候分区的实际使用年限 — 帮你判断 2605 的溢价在你的项目上是否值得。
Numbering logic, stiffener layout, fixing centres and fold directions — the four fields that decide how fast your crew installs.编号规则、加强筋布置、挂件间距与折边方向 — 决定安装速度的四个关键字段。
What actually drives cost and schedule when buying panels from China — and the questions to ask before comparing two quotations.从中国采购铝板时真正影响成本与工期的因素，以及在比价之前必须问清的几个问题。
How open area affects rigidity, and why a 40% perforated panel needs more than intuition to stay flat.开孔率如何影响刚度，以及为什么 40% 开孔的板不能只靠经验判断能否保持平整。
Subframe tolerance, fixing compatibility and the twenty-minute inspection that prevents most installation disputes.龙骨公差、挂件适配性，以及一套二十分钟的检查 — 能避免大部分安装纠纷。
Everything below is free and does not require a login. Ask us by email and we send the current version — dated, so nobody works from an obsolete revision.以下资料全部免费，无需注册。邮件告诉我们即可拿到最新版本 — 文件均标注日期，避免有人拿过期版本施工。
Ask an engineer directly — we answer technical questions whether or not you order.直接问工程师 — 无论是否下单，技术问题我们都会回复。