An airbeam includes at least a pair of inflatable beams each having an inner sleeve, middle sleeve and outer cover. Each sleeve is stitched to form flat side seams. The sleeves are inverted so that each flat side seam is disposed cantilevered inwardly on the inside of the sleeve. A linear common seam bisects the stitched side edges of the outer cover to form a pair of outer sleeves. One middle sleeve is nested within each outer sleeve. One inner sleeve is nested within each middle sleeve. One inner tube is nested in each inner sleeve. The nesting is arranged so that the side seams of the inner and middle sleeves are adjacent one another or overlap one another along, their entire length and so that the side seams of the outer cover are adjacent or overlap the side seams of the middle sleeve.