选购材料最主要考虑什么？
What is the most important consideration in selecting materials?
首先是防水性能，然后是环保性能。防水是隐蔽工程，防水做完后贴砖，如果选用了有毒的材料，就像在家中埋了“毒气炸弹“一样，长期释放毒气，而且重新拆换很难，所以对于材料的环保性也是选购材料的十分重要的方面。
First of all, waterproof performance, then environmental protection performance. Waterproofing is a concealed project. When waterproofing is finished, sticking bricks, if toxic materials are selected, it will release toxic gas for a long time, just like burying a "gas bomb" in the home, and it is difficult to re-dismantle. Therefore, environmental protection of materials is also a very important aspect of material selection