Can be eight or eleven feet long. In actuality, it can be as long as you want. 2x4 refers to the width and height dimensions of the plank, not the length. So I could cut a 2x4 to 2 inches long and it would be a 2 inch long 2x4.
8
20x20 = 400 2x4= 8 400/8= 50 needed
You will need at least 13-9' 2x4's, on 16" centers, and 2-16' 2x4's for plates. (Deduct plate thickness from stud length)
2x4 represents the nominal dimensions of the cut wood when 'wet' as from a fresh cut tree. The wood eventually dries and shrinks so your 2x4 measures more like 1 1 1/2" x3 1/2".
1.5 inches
Because your tape measure was made in China
1 mm = 0.039 inches (really thin!). There are 25.4 mm in each inch.
The 2x4's I use measure 1 and a half by 3 and a half.
2x4-56 2x4=8 8-56= -48)
A "board foot" is 1 inch thick, 12 inches wide, 12 inches long. A 12 ft 2x4 would be 8 board ft- 1/3 the width, but 2X the thickness.
Yes.
really thick
2x4 does not equal 7, it equals 8. 2x4=8 is a correct statement.
A tape measure one inch thick.
You wouldn't. If you really wanted to you could, but it would be very impractical as a nickel is 1.95mm thick. So, there's roughly 512.8 nickels in a meter. So there are 512800 nickels in a kilometer. A nickel is 0.00000195km thick.
Measure the width from support housing to support housing using a tape measure and cut to the exact length. Sizes will vary depending on the bedliner.