Basement Foundation Repair

Hey guys, First time poster to the forum looking for some advice on a basement situation. Looking through some of the older posts, I feel like my situation has a little twist that might change the opinions/recommendations on what to do. Ideally looking for a DIY solution to maintain a finished basement. [b]Background[/b]: We just purchased an older home built in the 60's/70's where the foundation is cinder block. To my knowledge, there is no exterior waterproofing done as I see heavy efflorescence in some areas. Currently there is a slight mold problem that came back as being common household molds in addition to a high 75 humidity level during the spring and low 55 during the winter. [b]Current: [/b]Since moving in I've gutted the basement down to the studs exposing the cinder block. Constantly running a smaller dehumidifier which simply cannot keep up with the humidity. Now the twist...since exposing the walls and moving in, I have not seen any standing water and my sump pump has never gone off or have seen water in my french drain. I actually had a water proofing company come in and say well you don;t have a water problem but you do have a humidity problem. [b]Question[/b]: What would be my best option to water proof and reduce the humidity in my basement? Should I be using DryLok? Would that cause damage to the block considering the moisture trapped in the block itself? Will this last for our lifetime at the house? I already know that I am going to be buying a heavy duty dehumidifier once we re-hang drywall, but would like to get some fellow DIY'rs opinions on what has worked best for them. Thanks for the advice in advance! Eddie

I am remodeling our cape. we have a huge addition on the back of the cap but i would like to add a fourth bedroom upstairs which is unused as a spare room. question is from floor to ceiling i only have 74 inches. can put a wall up to create a closed off bedroom. there is windows on both ends of the cape so the room will have a window as well as a heat also inside. is this allowed by code to do this?