Woven roving is much like woven cloth except that it is much heavier and woven differently.   It looks much like basket weaving with heavy bundles of non twisted strands of glass fibres woven loosely at right angles so that there is relatively, a lot of space between individual bundles of strands.   These spaces allow resin to flow through and more easily wet out of the roving.   The amount of resin required to impregnate woven roving is approximately equal to its own weight.

   This material is the real meat of your fibreglass laminate and is sold in various weights per square yard or square metre.  Woven roving is available from 8 oz. per square yard [270 g/m 2] to 27 oz. per square yard [900 g/m 2], with a variety of intermediate weights.   It is supplied in a number of weave patterns such as, bi-directional, unidirectional, biaxial, triaxial, double bias and specially stitched fabrics