For those preparing to investigate demolition its important for everyone to familiarize themselves with the terms and requirements in demolition preschool keeping in mind that all properly executed demolitions result in a total "collapse" of the target structure. Every industry has its own slang and jargon and in the demolition world like trap shooting words like pull or shoot are used to initiate the release of a clay pigeon or initiate a demolition and words like vertical and footprint are used to distinguish the difference between simply tipping a structure over on its side or removing its support structure to attempt to get the bulk of the structural material to fall as vertical as possible when there is not enough room to topple it onto its side, which requires the least preparation and is the most cost effective method for destruction. The objective of building demolition that is toppled on its side is to remove the support structure from one side of the building, much in the same manner as chopping down a tree which will cause the structure to fall in the direction of the removed structure. Here is an example of a structure that has had its support removed on one side and it thus topples over on its side. (in this case a failed vertical demolition). you can see how the building just rolls right on over, sort of like a trougher. another intended and failed vertical demolition where the bulk of the material topples while the core is left standing. Another illustrating that crush down does not work with steel construction. another, only this time it is a collapse not by demolition but by natural causes and simple structural failure. we can see how it very slowly begins to give away and then completely falls over on its side damaging the building across the street. Demolishing a building by the toppling pr tipping method is the most simple and unsophisticated method by which to bring down old buildings and is also the most economical for labor and materials. Demolishing a building with the intent for a vertical drop is a little more tricky and requires considerably more resources as you will need to hire a structural engineer to choose the best places to strategically cut columns in a manner that causes grouped global or sequentially global or fully global simultaneous failure of several supports in groups or sequential groups or all supports in sequence to achieve grouped sequential or total simultaneous failure. So this can get a little tricky and requires a good deal of skill as we can see from the two failed demolitions above that substantial damage can be inflicted upon adjacent properties should any step in the process such as placement detonation or timing fail as seen in the following pictorial; examples of planned "vertical" demolition commonly known in the industry as dropping it in its own "footprint" are: another demonstration of near simultaneous removal of all supporting structure in for vertical drop. another and again demonstrating near perfect sequence timing;: so class who can describe for us the different requirements to plan a vertical in its own foot print demolition compared to the elements required to topple a structure on its side style demolition?