In order to keep it dry 52’ of a French drain is needed with a sump pump. The cost to keep that basement dry is $4,675. Let me know if you have any questions. That basement has been flooding out for a long time with the condition of the floor. It will keep it bone dry with that proposal.
我觉得做工还行，花了$4600.你们做一个这种工程大概多少？
希望以后没水了。这家公司保证地下室会bone dry.有问题再回来。
前房主加过钢管支撑，可能地基出现过下沉。
drainage的原理。
sump pit。沟里是石子。
perforated pipe。被board挡住的的墙体上一般是打洞更有利于水进来。
比如凿掉几寸地下室底板边缘，下挖几寸，安装drain。 有无必要和利弊？东北部地区是否可行？ 另外第二种方式如何隔断封口混凝土下渗？ 用plywood隔断？先谢W2兄解惑！
https://www.jlconline.com/how-to/foundations/foolproof-cure-for-wet-basements_o