Some newer homes have manufactured i beam shaped joists.
Framing second floor platform.
A floor s framework is made up mostly of wooden joists that run parallel to one another at regular intervals.
Fire stops are automatically created with this type of construction.
The first floor platform is constructed and then the exterior walls.
The main difference between platform and balloon framing is at the floor lines.
The balloon wall studs extend from the sill of the first story all the way to the top plate or end rafter of the second story.
The platform framed wall on the other hand is independent for each floor.
Platform framing is easier than balloon framing because you can construct and erect the second story walls on the second story floors.
Ceiling joists are usually 2 by 6s or sometimes 2 by 4s if it is an older home.
The second floor exterior walls are built on top of the subfloor.
Platform construction is much more common than balloon framing though balloon framing was employed in many two story houses before 1930.
Floor joists are typically 2 by 8s 2 by 10s or 2 by 12s.
Balloon framing is not used as much anymore as platform framing the most popular technique for new construction of two or three story homes.
The second floor joists are attached to the first floor exterior walls.
With platform frame construction shown below walls sit on top of subflooring.
In addition to larger lumber several items are needed to give the home more support when framing for the second floor.
With a second story you have to build it with larger lumber to support the second floor.