18oz Woven Roving

18 oz woven roving is what you lay in when a hull, stringer or transom repair needs thickness quickly. Coarse E-glass bundles woven 0/90 build more bulk per ply than a cloth of equal weight, so a short stack alternated with chopped strand mat gets you a structural laminate without piling up light plies.

Where it goes in the schedule

In a polyester layup, roving always sits between plies of chopped strand mat. The mat wets out against each face of the roving and fills its open weave; the roving supplies the bulk. Two plies of roving laid face to face trap voids where the bundles cross and give each other almost nothing to grip, so keep a mat ply between them. The same layup serves boat construction, tooling molds and panel work on RVs and trailers.

Picking a length

Cuts of 1, 3 and 10 yards cover repair work. The 125 yard full roll is for production layups and mold building.

• E-glass woven roving, 18 oz/yd², white
• 0/90 woven, thread count about 5 x 4
• 50 in wide
• 1, 3 or 10 yard cuts, or a full roll of 125 yards
• Takes about 1:1 resin to glass by weight, roughly 2.09 oz of resin per square foot
• Polyester, vinyl ester and epoxy compatible

Work out how much resin a layup will take with the resin calculator.