Plywood and osb o 2 grade.
Skyscraper floor section thickness.
And the wtc was being upgraded as floors become open to a new level of fireproofing before 9 11.
The older building around the wtc comples that had the old code and was of newer construction faired very well.
Standard drywall installed on the ceiling below the floor adds a minimum of 1 2 inch to the floor thickness.
In some cases such as a party ceiling which separates individual apartment units building code may require double drywall layers to reduce.
There are thinner types of drywall but they are not adequate for ceiling installation.
For joist spans 16 inches or less nwfa recommends minimum panel thickness of 5 8 inch plywood or 23 32 inch osb.
The building code requires 5 8 inch plywood or osb.
The fireproofing level code used on the wtc was change in the city of new york right before this project begin.
When nwfa guidelines minimums are not met the recommendations are to overlay the existing subfloor material with a 1 2 inch panel product or add structural support from below.
This construction is suitable in reasonably stiff soils or marl.
Click build to see how the parts of a skyscraper work together.
The bulk of the floor s thickness comes from the joists which are the horizontal beams that carry the floor s weight.
Maximum spacing of supports mm.
Osb o 1 grade and.
An acceptable arrangement for a foundation of a small timber building with a concrete or wood floor is shown in these figures.
Many buildings also have diagonal beams running between the girders for extra structural support.