When I started looking around this house I found none of the previous homeowner's splices used anything but the twist and tape method. He wrapped stranded wire around the solid and folded them over, pinching the stranded. It looked very ugly but I have to admit I didn't find one that had any signs of heating, even in the 1440w bathroom heaters. Copper is very forgiving I guess.
I think I have finally got all of this wiring out but it wasn't easy finding it all. Fortunately he seemed to have a spool of dark brown TW style romex he used so it is easy to trace. Most was done in the 3:12 attic and then covered with blown cellulose. The original 1963 (asphalt/paper Romex) wiring was soldered and taped. That is solid but a pain to work on. I got back to original and stopped screwing with it, running new circuits when I wanted something.
