And at the same time, fibers stretch along the bottom edge. As a beam bends the outermost (extreme) fibers are compressed along the top edge. Loads cause beams, joists and rafters to bend. Fb value or extreme fiber stress in bending. ![]() For example: No.2 grade eastern white pine has an E value of 1,100,000 and No.2 hem-fir has an E value of 1,300,000. A material with a higher E value is stiffer. E is a ratio that relates the amount a given load causes a material to deform.
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