Best method to have destroyable structures?

Lets say I want to have a building, that, when exploded, will fall apart. I figured out that the most effective way to do this is to have the parts Welded to something. One way would be to anchor a part, Weld everything to that part, and the Welded parts are "anchored" (not really, but it looks like it), and when an explosion touches them, the "unanchor". However, all this has one problem. If I have a tall building, and explode it in the middle (and so separating the building into two separate halves) the top half (which is now in mid-air) would keep floating, because the part they are Welded to is anchored. So what I need to do is Weld the parts to EACH OTHER, and then Anchor the base of the structure. I was just wondering, if anyone knows any plugins or anything, perhaps a different method (I heard that using different Surfaces would do something similar). Thx.