The present invention relates to a stabilizer support 10 and a method of using the stabilizer support 10 to support a laterally unsupported surface 100. The stabilizer support 10 has a longitudinally extending rigid beam 20, a clip 30, and a foot plate 40. The beam 20 has a longitudinal length 21, a longitudinal first end 22, and a longitudinal second end 23. The beam 20 is marked at graded intervals 50 along its longitudinal length 21. The clip 30 is configured and arranged to engage the first longitudinal end 22 of the beam 20 and the foot plate 30 is configured and arranged to engage the second longitudinal end 23 of the beam 20.