

Need insights on installing perimeter drain around old foundation
Hi, for many years my basement has had major water problems during rainy seasons making the whole space unusable for anything but storage (on raised pallets), so I finally decided to repair/replace/install new perimeter drain, but unlike the foundations I have experience with from working in construction it seems my house is so old that when it was poured they only made fourms on the inside leaving the exterior to take the rough shape of the hole that was dug, my question is how can I property waterproof the uneven surface of this foundation? In construction we used dimpled membrane on the foundation walls down to the footer where we laid the perimeter drain but I'm not sure if that way will work with how uneven it is. Anyone encountered this kind of old foundation before? It's only about 3ft deep but I'd like to do it properly if possible.