Machine Stress Rated (MSR) and Machine Evaluated (MEL) Lumber

Grading of lumber in North America

MSR - Machine Stress Rated Lumber

MSR is lumber that has modulus of elasticity E evaluated by mechanical stress equipment, with each piece being marked to indicate the modulus of elasticity E.

Grade Name	F_b (psi) Load Calculator!	E (10⁶ psi) Load Calculator!	F_t (psi) Load Calculator!	F_c (psi) Load Calculator!
1350f-1.3E	1350	1.3	750	1600
1450f-1.3E	1450	1.3	800	1625
1650f-1.5E	1650	1.5	1020	1700
1800f-1.6E	1800	1.6	1175	1750
1950f-1.7E	1950	1.7	1375	1800
2100f-1.8E	2100	1.8	1575	1875
2250f-1.9E	2250	1.9	1750	1925
2400f-2.0E	2400	2.0	1925	1975
2550f-2.1E	2550	2.1	2050	2025
2700f-2.2E	2700	2.2	2150	2100
2850f-2.3E	2850	2.3	2300	2150

F_b - allowable 10-year load duration bending stress parallel to grain
E - modulus of elasticity
F_t - allowable 10-year load duration tensile stress parallel to grain
F_c - allowable 10-year load duration compressive stress parallel to grain

MEL - Machine Evaluated Lumber

MEL is lumber where a parameter like density is evaluated nondestructively by mechanical grading equipment to predict certain mechanical properties. A MEL machine evaluates each piece and sorts each piece into various strength classification grade categories.

Grade Name	F_b (psi) Load Calculator!	E (10⁶ psi) Load Calculator!	F_t (psi) Load Calculator!	F_c (psi) Load Calculator!
M-10	1400	1.2	800	1600
M-11	1550	1.5	850	1675
M-14	1800	1.7	1000	1750
M-19	2000	1.6	1300	1825
M-21	2300	1.9	1400	1950
M-23	2400	1.8	1900	1975
M-24	2700	1.9	1800	2100

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Machine Stress Rated (MSR) and Machine Evaluated (MEL) Lumber

Grading of lumber in North America

MSR - Machine Stress Rated Lumber

MEL - Machine Evaluated Lumber

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