Fiberglass Mesh

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Buyer guide
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Zbcarbon
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Which light fiberglass mesh (45–75 g/m²) should I use for drywall joints, waterproofing and mosaic backing?

Use light meshes of 45–75 g/m² inside buildings and inside other materials, where the mesh controls cracks rather than carrying impact. A fine 3 × 3 mm mesh of 45–60 g/m² suits waterproofing membranes, skim coats and mosaic backing. A 65–75 g/m² mesh suits interior plaster and board joints. Exterior insulation (EIFS) needs heavier mesh, covered in our EIFS mesh guide.

45–75 g/m²light-duty mesh range
2.85 × 2.85 mmfinest standard opening
≥ 900 Nweft strength of the 75 g mesh, per 50 mm
1 m × 50–100 mroll sizes

How do the five light meshes compare?

Mesh Opening Warp strength (N/50 mm) Weft strength (N/50 mm) Coating Roll
45 g/m² 3 × 3 mm ≥ 500 ≥ 300 acrylic, 18% 1 × 100 m
50 g/m² 3 × 3 mm ≥ 500 ≥ 450 acrylic, 18% 1 × 100 m
60 g/m² 3 × 3 mm ≥ 500 ≥ 600 acrylic, 18% 1 × 100 m
65 g/m² (AR) 2.85 × 2.85 mm (9 × 9 per inch) ≥ 700 ≥ 700 acrylic, 18% 1 × 50 m
75 g/m² 5 × 5 mm ≥ 600 ≥ 900 acrylic, 16% 1 × 50 m

Values from each mesh’s technical data sheet[1][2][3][4][5]. The 45, 60 and 65 g/m² sheets also state an alkali-resistance retention of at least 50% in warp and weft.

Which mesh for which job?

Job Suggested mesh Why
Waterproofing membranes (bathrooms, roofs, balconies) 45–60 g/m², 3 × 3 mm fine opening, embeds fully in thin coatings
Mosaic and tile backing 45–60 g/m², 3 × 3 mm holds small tiles, light and flexible
Skim coats and thin interior plaster 60–65 g/m² fine mesh, more strength
Gypsum board and drywall joints 50–65 g/m² crack control across joints
Interior cement plaster, crack bridging 65–75 g/m² higher strength, 5 × 5 mm lets plaster key through
Exterior insulation (EIFS), impact zones 145–160 g/m² and up see the EIFS guide
Rolls of white fiberglass mesh
Light meshes come in 1 m wide rolls of 50 or 100 m.
Fiberglass mesh being wound into rolls
Coated mesh being wound into rolls.

Why does the coating matter in light meshes?

Plaster, mortar and many membranes are alkaline, and alkali slowly attacks glass. The acrylic coating protects the glass, and the alkali-retention figure on the datasheet tells you how much strength is left after an alkali test[1]. In cement-based products, ask for a mesh that states its alkali-resistance retention.

TipLight meshes are often bought by price per roll. Check roll length: some come in 100 m rolls, others in 50 m. Compare price per square meter, not per roll.

What to send

Mesh weight, opening, color, roll width and length, and quantity in rolls or square meters. Free A4 mesh samples are available[6]. Use the quote form or see the 45–160 g fiberglass mesh page.

Sources

  1. Technical data sheet, fiberglass mesh 45 g/m², 3 × 3 mm: warp ≥ 500 N, weft ≥ 300 N per 50 mm; alkali retention ≥ 50%; acrylic 18%; leno; 1 m × 100 m
  2. Technical data sheet, fiberglass mesh 50 g/m², 3 × 3 mm: warp ≥ 500 N, weft ≥ 450 N; acrylic 18%; 1 m × 100 m
  3. Technical data sheet, fiberglass mesh 60 g/m², 3 × 3 mm: warp ≥ 500 N, weft ≥ 600 N; alkali retention ≥ 50%; acrylic 18%; 1 m × 100 m
  4. Technical data sheet, alkali-resistant fiberglass mesh 65 g/m², 2.85 × 2.85 mm: warp and weft ≥ 700 N; alkali retention ≥ 50%; acrylic 18%; 1 m × 50 m
  5. Technical data sheet, fiberglass mesh 75 g/m², 5 × 5 mm: warp ≥ 600 N, weft ≥ 900 N; acrylic 16%; leno; 1 m × 50 m
  6. Free A4 samples of fiberglass mesh

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