Building Materials

Comparison Table

Lumber Dimensions

Dimensional softwood lumber nominal sizes differ from actual surfaced (S4S) dimensions due to drying and planing: 2x4 is actually 1.5 x 3.5 inches (38 x 89 mm), 2x6 is 1.5 x 5.5 inches (38 x 140 mm), and 4x4 is 3.5 x 3.5 inches (89 x 89 mm).

Comparison Table

Pipe Schedules

Schedule 40 and Schedule 80 pipes share identical outer diameters (OD) for a given nominal size, but Schedule 80 features thicker internal walls, reducing inner diameter (ID) to handle higher operating pressures.