07-31-2024, 11:28 AM
This post was last modified 07-31-2024, 11:33 AM by FlyingClayDisk.
Without making any particular comment on 9-11 directly, and/or rendering an opinion on any conspiracies, I can make a comment on a couple things based on my familiarity construction and engineering practices.
Installation of spray-on fireproofing products like Monokote (and similar) require access to the structural steel and steel decking on the underside of floors. To upgrade fireproofing systems which were installed before many of these products were invented is a very disruptive process because it involves 'demolishing' all of the interior finishes (i.e. drywall, wall coverings, insullation...basically everything, right down to the structural skeleton). Once the structural steel and structural members are exposed, any and all previous fireproofing materials must be removed (which creates a colossal mess, and in some cases hazmat). Once the cleanup is complete, then the new fireproofing can be applied. This is usually done by mixing water with the dry fireproofing materials in a large cement mixer-like drum with a turning auger. The fireproofing slurry is then sprayed onto all of the structural surfaces to a desired thickness as specified by engineers. Overall, it's a very slow and painful process.
Because this process is so disruptive, all occupants must be completely removed from all areas where the work is to be completed for an extended period of time. This includes furnishings, floor coverings, ceilings, lights...everything. And because this process requires such extensive demolition and relocation, and expense, areas to be completed must be prioritized based on various criteria. One of these criteria are 'risk' of fire balanced against other factors like ease of performing the work (i.e. like during tenant changes or build outs) and cost.
So, a couple things here. I would absolutely expect that there would be "demolition" personnel authorized to access the areas where fireproofing operations were to take place. These demolition people aren't the type who implode buildings, but rather just contractors who do demo work to remove all of the obstacles to getting at the structural steel (i.e. drywall, ceilings, insulation, electrical, plumbing, mechanical, flooring, built-in furnishings, asbestos abatement, etc.). They then load all of the refuse trucks to haul all this stuff off for disposal.
As far as the selection of where to perform these fireproofing upgrades first, they would select the highest priority areas balanced against the lowest cost areas first.
As to why the planes impacted these areas, and not other areas, I have no idea.
Hope this helps some.
Installation of spray-on fireproofing products like Monokote (and similar) require access to the structural steel and steel decking on the underside of floors. To upgrade fireproofing systems which were installed before many of these products were invented is a very disruptive process because it involves 'demolishing' all of the interior finishes (i.e. drywall, wall coverings, insullation...basically everything, right down to the structural skeleton). Once the structural steel and structural members are exposed, any and all previous fireproofing materials must be removed (which creates a colossal mess, and in some cases hazmat). Once the cleanup is complete, then the new fireproofing can be applied. This is usually done by mixing water with the dry fireproofing materials in a large cement mixer-like drum with a turning auger. The fireproofing slurry is then sprayed onto all of the structural surfaces to a desired thickness as specified by engineers. Overall, it's a very slow and painful process.
Because this process is so disruptive, all occupants must be completely removed from all areas where the work is to be completed for an extended period of time. This includes furnishings, floor coverings, ceilings, lights...everything. And because this process requires such extensive demolition and relocation, and expense, areas to be completed must be prioritized based on various criteria. One of these criteria are 'risk' of fire balanced against other factors like ease of performing the work (i.e. like during tenant changes or build outs) and cost.
So, a couple things here. I would absolutely expect that there would be "demolition" personnel authorized to access the areas where fireproofing operations were to take place. These demolition people aren't the type who implode buildings, but rather just contractors who do demo work to remove all of the obstacles to getting at the structural steel (i.e. drywall, ceilings, insulation, electrical, plumbing, mechanical, flooring, built-in furnishings, asbestos abatement, etc.). They then load all of the refuse trucks to haul all this stuff off for disposal.
As far as the selection of where to perform these fireproofing upgrades first, they would select the highest priority areas balanced against the lowest cost areas first.
As to why the planes impacted these areas, and not other areas, I have no idea.
Hope this helps some.
