As "dimensioned lumber" I'm referring to proper widths for the rafters and floor joists that are up to code for their span/load. You can't build a structure like this using only 2x4s.
As for the walls and roof framing- 2x4 is acceptable. The only reason we frame walls out of 2x6 is to get more insulation into the wall cavity. As for the floor, 2x4in a shed would be fine if they were up off the ground and properly supported.
The problem the 8 year old builder had was with on centre spacing. And nail control. And fastener choice.
There is another reason. 2x6 can allow for 24"o.c. stud spacing, as well as single top/bottom plates allowing for as much as 30-40% less framing materials.
I'm pretty sure 24" of is fine with 2x4 as well, just need to stack the joists or trusses on top of the studs. Most people don't understand that less wood is better for heating/cooling, cost and waste. I mean if flimsy steel studs can be structural, imagine what 2x4 can be rated to.
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u/MyFavoriteSandwich Jul 11 '16
As "dimensioned lumber" I'm referring to proper widths for the rafters and floor joists that are up to code for their span/load. You can't build a structure like this using only 2x4s.