Alkali Resistant Mesh

Alkaline-resistant mesh is a strong net installed within wall systems before the addition of render or plaster. It will not break down in the alkaline cementitious mixes, keeping walls solid and looking great long after the job is done.

What Is Alkali Resistant Fibreglass Mesh?

Alkali resistant render mesh is a special type of reinforcing fabric used in wall finishes. The mesh is embedded within plaster, render, or cement layers to stop cracks from forming.

To make it alkali resistant, it is treated to withstand the strong chemicals (called alkalis) found in cement and lime mixes. Standard glass-fibre mesh is not suitable for cementitious environments.

What Is Alkali Resistant Fibreglass Mesh Used For?

Here’s where builders use alkaline resistant render mesh:

1. External Wall Insulation (EWI) systems – between the basecoat and topcoat of render on insulated walls.
2. Within thin-coat renders – embedded in the basecoat to add strength and prevent hairline cracks as the render cures.
3. Large wall surfaces – on bigger façades, AR mesh helps evenly distribute stresses across the render, reducing the chance of cracks forming over wide areas.
4. Refurbishment projects – help stabilise new render coatings over older brick, block, or uneven surfaces.
5. Impact-prone areas – helps the render resist damage in places exposed to knocks or minor impacts. For example, corners, edges, and high-traffic areas.

Benefits Of Alkaline Resistant Render Mesh

Here’s why it is important to add alkali resistant fibreglass mesh on walls:

1. Stops Cracks Before They Start

Walls and substrates naturally expand and contract with changes in temperature, humidity, and movement. The mesh spreads out these forces so that tiny cracks do not appear in the render or plaster.

2. Adds Strength

The mesh acts like a skeleton inside the wall coating. It makes the render stronger and more resistant to bumps, knocks, or pressure.

3. Keeps Surfaces Smooth

Because it spreads stresses evenly – and with the correct installation technique – the finish stays flat and neat, making it easier to get a professional-looking wall.

4. Essential for Insulation Systems

When used in external wall insulation (EWI), the mesh sits between layers to hold the system together. It stabilises the reinforced basecoat in EWI systems, helping the render withstand weather and temperature changes.

5. Long-Lasting

The “alkaline-resistant” treatment stops the fibres from breaking down in cement. Therefore, the mesh reinforces the wall and keeps it crack-free for a long time.

Why Choose Our Alkali Resistant Glass Fibre Mesh?

Here’s why customers across the UK trust alkali resistant glass fibre mesh from Insulation Wholesale:

• Keeps plaster and cement strong and smooth.
• Resists harsh chemicals for lasting performance.
• Quick, easy purchase when you buy alkali resistant mesh online.
• Affordable prices, with volume discounts for bigger projects.

Want quality alkali resistant fibreglass mesh for long-term durability? Shop the premium selection at Insulation Wholesale and order from UK stock now to unlock competitive trade discounts.

FAQ

Where to buy alkali resistant mesh?

You can get top-quality alkali resistant mesh directly from Insulation Wholesale. We stock a wide range of mesh suitable for all plaster and cement projects, and supply it at competitive prices. With easy online ordering, trade discounts, and fast delivery across the UK, Insulation Wholesale makes it simple to get the right mesh when you need it. Check our website for the latest offers and stock availability.

What is alkali resistant mesh?

Alkali resistant mesh is a net-like glass-fibre material added to reinforce cement, plaster, and render coatings on walls. Its primary purpose is to prevent cracks and keep the surface firm and even. The mesh can withstand strong alkaline chemicals – such as those found in cement and lime – and will not degrade or lose strength over time.

How to fix alkali resistant mesh?

1. Cut the mesh to size.
2. Place it over the surface you want to reinforce.
3. Embed the mesh into a wet plaster, render, or cement layer.
4. Press it gently to flatten it and remove wrinkles or bubbles. Ensure it sits in the middle third of the basecoat.
5. Fully cover it with another thin layer of the mix. This locks it in place and creates a smooth, crack-resistant finish.