this barb orientation further prevents substantial cutting or elongation of the pierced holes in the underlayment 14 by the thin edge of the barbs 228 a and 228 b in one plane by virtue of the broad surface in the other plane alternatively the secondary barbs 228 b may also be positioned adjacent to the primary barbs 228 a between the windows 240 or in lieu of the windows 240 as shown in fig7 the primary barbs 228 a may be positioned in a row closer toward the center of the first leg 222 the back flange 246 is preferably narrow to permit the second leg 224 to be bent or formed to follow the contour of the intended pathway or shape of the paved area as will be described below the embodiments of fig6 and 7 show optional nail holes 242 formed into the first leg 222 to provide for nails spikes or staples to anchor the edging rail to the base layer if so desired referring now to fig8 and 9 there is illustrated another embodiment of an edging rail shown generally at 312 that includes first and second legs 322 and 324 respectively and barbs 328 that may be similar in geometry and relative orientation to the barbs 28 128 and 228 a b.