If the damage has already been done, you will need to address the root cause (hydrostatic pressure), as well as the damage and secondary issues.
The Process
When repairing the fallout of excessive hydrostatic pressure, the first step will generally be draining your basement or crawl space. This is not always the case, but when hydrostatic pressure creates cracks in the structure of a property, flooding and dampness are likely. Once standing water has been removed, the process of keeping it out begins.
The next step is the stabilization and repair of structural problems like bowing walls, foundation damage, and fragmentation. Once these issues have been dealt with, the structural damage and mitigated the elevated levels of hydrostatic pressure, internal repairs can begin. This means removing mold and mildew and repairing damaged joists, for example.
Do Not Try DIY
It is especially important that you do not try to undertake DIY when you see signs of structural damage and excessive hydrostatic pressure. While we understand the temptation to act quickly and save money by doing the work yourself, this can be incredibly damaging for your home and even dangerous to your health and well-being. This is partly because of the likelihood of structural issues.
Structural damage is the one area that we really recommend you never stray into as a non-professional. Even the best DIY enthusiast is not equipped to undertake something like foundation repair or wall stabilization and straightening. Professionals, by contrast, have the tools, training, and products that they need to give a great result at a better long-term price.