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Stucco Fibreglass Mesh
The reinforcing layer that keeps stucco from cracking apart.
Stucco is strong in compression and weak in tension, which is exactly the kind of material that needs reinforcing mesh embedded in it to keep small movements in the wall from turning into visible cracks.
Alkali-resistant fibreglass mesh is embedded in the finish coat (or, for self-furring wire mesh, in the scratch coat over sheathing) to spread out the stress that causes cracking, so movement in the substrate shows up as many fine hairlines instead of one wide crack.
We stock standard-weight mesh for typical residential and commercial finish coats, and can special-order heavier mesh for high-impact areas like ground-floor commercial walls.
Self-furring wire lath and fibreglass mesh solve different problems, even though they both get called "mesh" on site. Self-furring lath is a metal product that holds itself off the sheathing to create an air gap and gives the scratch coat something rigid to key into, so it's doing structural bonding work. Fibreglass mesh is embedded closer to the surface, in the finish or base coat, and its job is purely to distribute tension so hairline cracks spread out thin instead of concentrating into one wide crack. A typical three-coat wall uses lath at the scratch coat and mesh nearer the finish, working together rather than as substitutes for each other.
Installation technique matters as much as the material itself. Mesh has to be fully embedded in wet material, not just pressed onto the surface, or it won't do its job of distributing stress once the coat cures. Seams need consistent overlap so the reinforcement is continuous across the whole wall rather than leaving weak, unreinforced gaps at every joint. And mesh works best when it's centred in the coat thickness rather than pushed to one face, which is a detail plasterers pay close attention to on a well-run job.
Most manufacturer finish systems, including common EIFS and acrylic stucco finishes, specify a minimum mesh weight and overlap as part of the warranty requirements for the system, not just as a general best practice. If you're working under a specific manufacturer's system, it's worth checking their spec sheet for the exact mesh weight and overlap called for, since using a lighter mesh than specified can affect warranty coverage even if the wall looks fine on the day it's finished.
Roll Coverage Calculator
Enter your wall dimensions to estimate how many rolls of mesh to order, with an overlap allowance built in.
Standard 38" x 150' roll ≈ 475 sq ft. Adjust if your roll is a different size.
Estimate
1
rolls needed
270 sq ft
wall area (with allowance)
Estimate only. Call the shop to confirm before ordering.
Spec Sheet
What You're Ordering
- Material
- Alkali-resistant (AR) fibreglass mesh, coated for embedment in cementitious finishes
- Weight
- Standard weight for typical finish coats, heavier weight available for high-impact areas
- Roll size
- Standard roll widths and lengths in stock, ask for exact coverage per roll
- Related products
- Masonry diamond mesh (lath), stucco tapes and stucco washers & screws, see our full product line
Questions
Stucco Fibreglass Mesh FAQ
What's the difference between fibreglass mesh and diamond lath? +
Fibreglass mesh is embedded in the finish/scratch coat for crack control. Diamond (expanded metal) lath is the base layer that the scratch coat actually bonds to over open framing or sheathing. Most jobs use both, at different stages.
How much overlap does mesh need at seams? +
A minimum overlap at every seam is standard practice to keep the reinforcement continuous. Check your finish system's specific requirement, and we're happy to talk through it when you order.
Do I need heavier mesh anywhere? +
High-impact areas, ground floor walls, near entrances, anywhere likely to take a knock, are good candidates for a heavier mesh weight. Ask when you order and we'll point you to the right product.
Do you sell the fasteners for lath and mesh too? +
Yes, stucco washers and screws sized for lath and mesh attachment are stocked alongside the mesh.
Can I order a partial roll? +
We sell full rolls, but call the shop with your wall area and we'll help you figure out exactly how many you need. See the calculator below for a starting estimate.
Is fibreglass mesh required by code? +
Requirements vary by jurisdiction and by which finish system you're installing, so check your local building code and the manufacturer's spec sheet. In practice, crack control mesh is standard on nearly every stucco job we supply for.
Can mesh be used over EIFS foam insulation board? +
Yes, mesh embedded in the base coat over foam insulation board is a standard part of most EIFS assemblies. Confirm the weight and overlap called for by your specific system before ordering.
How do I estimate how much mesh a job needs? +
Measure the total wall area you're covering and add an allowance for overlap at every seam, typically enough to add up to a meaningful percentage of extra material on a wall with a lot of window and door cutouts. Use the calculator below for a starting estimate, and call the shop to confirm before you order.
Does mesh need to be cut around openings, or does it run continuous? +
It gets cut and lapped around windows, doors and other penetrations, with extra reinforcement often added diagonally at the corners of openings since that's a common spot for stress cracks to start.
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