Why is my basement so humid? What humidity is too high, why summer is worst, how to tell humidity from a leak, and how to size a dehumidifier.

Egress window requirements for a basement: the 5.7 sq ft rule, sill height, window well size, ladders, and when a finished basement needs one.

A musty basement after rain means water is reaching the wall. How to tell grading from seepage from humidity, and what fixes each one.