1.5mm vs 2mm Render: What’s the Difference? Coverage, Finish & Cost Explained

With over 25 years of experience, CorkRend specialises in high-quality external rendering and sustainable solutions. As approved applicators of CorkSol Spray Cork and K-REND, we offer silicone render, spray cork and External Wall Insulation (EWI), delivering expert workmanship and durable results tailored to each property.

Quick answer: Choosing an external render isn’t simply about picking a colour. The 1.5mm vs 2mm render decision can affect the texture, appearance, coverage and overall cost of your project. But which thickness is actually right for your home?

At CorkRend, we help homeowners choose rendering systems and finishes based on their property, surface condition and desired result. From silicone render and spray cork to External Wall Insulation (EWI), we provide tailored solutions rather than a one-size-fits-all approach.

In this blog, we’ll explore:

• 5mm vs 2mm: Coverage compared
• Which finish looks better?
• Is a 2mm render more expensive than a 1.5mm render?
• What about silicone render?
• Could pray cork be a better alternative?
• Conclusion
• FAQs

1.5mm vs 2mm Render: Which Finish is Right for Your Home

1.5mm Render: A Finer, Smoother Appearance

If you’re after a contemporary exterior with a relatively subtle texture, 1.5mm render can be an excellent option.

Because the aggregate is smaller, the finish tends to look more delicate and uniform. It works particularly well on modern properties where clean lines and a sleek façade are important.

Key benefits of 1.5mm render:

• Fine, contemporary texture
• Subtle appearance
• Suitable for modern homes
• Can create a more refined visual finish
• Smaller texture can make the façade appear less visually heavy

However, a finer finish can also make imperfections in the underlying surface more noticeable. That’s why proper preparation matters.

At CorkRend, we assess the substrate before application and prepare the surface appropriately, ensuring the final finish looks consistent and performs as intended.

2mm Render: More Texture and Character

Prefer a finish with a little more texture? A 2mm render could be the better choice.

The larger aggregate creates a more pronounced texture, which can add depth and character to an exterior. It can also be a practical option where you want the finish to have a stronger visual presence.

For example, imagine an older rendered property with minor visual irregularities. A more textured finish may help create a consistent overall appearance.

That doesn’t mean 2mm render hides every defect. Significant cracks, movement or substrate problems still need to be properly repaired before rendering.

1.5mm vs 2mm Render: Coverage Compared

Coverage is one area where homeowners often expect a simple answer: Does 1.5mm render cover more area than 2mm?

Not necessarily. Coverage depends on the specific product, manufacturer, substrate, application method and system specification. A larger aggregate size can require a different application thickness, but you shouldn’t estimate material requirements from grain size alone.

For an accurate calculation, we recommend checking the technical data for the exact render being used.

At CorkRend, we can assess your property and recommend the appropriate system and finish, helping you avoid ordering too much or too little material.

Which Finish Looks Better?

There’s no universal winner. It really comes down to the style of your property.

Choose 1.5mm if you want:

• A finer texture
• A clean, modern appearance
• A more subtle finish
• A contemporary look

Choose 2mm if you prefer:

• More visible texture
• Greater visual depth
• A slightly heavier finish
• A traditional or textured appearance

Colour also changes how texture looks. A light colour with a fine grain can appear very crisp, while a darker shade with a larger grain may create a stronger textured effect. That’s why it’s worth looking at actual samples before making your final decision.

Is 2mm Render More Expensive Than 1.5mm?

This is another question we hear regularly. There isn’t a fixed rule that 2mm render will always cost more than 1.5mm render.

The final price depends on several factors, including the selected product, wall area, preparation, access, labour, number of coats, and the condition of the existing façade.

A larger grain may influence material consumption, but it shouldn’t be used as the only basis for comparing quotes.

For example, two homes may require the same render finish but have completely different preparation requirements. One might need extensive repairs, while the other could be ready for application.

So when comparing prices, look beyond the cost per bag. Consider the complete rendering system and workmanship.

What About Silicone Render?

For homeowners looking for a durable, modern exterior, silicone render is worth considering.

At CorkRend, we use trusted systems such as K Rend and provide silicone render solutions designed to offer flexibility, breathability, water repellency and low maintenance. These systems can be suitable for full re-rendering, extensions, refurbishments and upgrading tired or cracked exterior finishes.

The finish can then be selected according to the appearance you want, including the appropriate texture and colour.

Could Spray Cork Be a Better Alternative?

Sometimes, the question isn’t really 1.5mm vs 2mm render. If your priorities include insulation, flexibility, sustainability, and weather protection, spray cork may be worth considering.

CorkRend is an approved applicator for CorkSol Spray Cork. Our spray cork systems can be used with a high-performance K Rend basecoat or, where suitable, as an overspray solution over an existing finish. CorkSol is designed to provide a breathable, flexible and weather-resistant exterior coating.

This can be particularly useful when renovating an older property where completely removing the existing finish may not be the most practical approach. Our Corksol is an innovative choice for homeowners who want more than just aesthetics.

Conclusion: 1.5mm or 2mm: Which Should You Choose?

So, 1.5mm vs 2mm render, which is better? If you want a finer, contemporary appearance, 1.5mm may be the ideal choice. If you prefer stronger texture and visual depth, 2mm could be more suitable.

But the best result comes from choosing the right complete render system, not simply the smallest or largest grain.

Ready to improve your home’s appearance, comfort and protection? At CorkRend, we provide insulated render, spray cork render, and professional outside rendering in Northampton, tailored to your property’s needs.

Contact us at 07592485118 today for expert advice and a free, no-obligation quote!

FAQs About 1.5mm vs 2mm Render

Is 1.5mm render smoother than 2mm render?

Generally, yes. The smaller aggregate in a 1.5mm finish creates a finer texture, while 2mm render has a more pronounced grain.

Does 2mm render cover more imperfections?

A more textured finish can visually disguise minor surface irregularities better than a very fine finish. However, major cracks or substrate problems should always be repaired rather than simply covered.

Is a 1.5mm render cheaper than a 2mm render?

Not necessarily. Price depends on the product, preparation, labour, wall condition and complete render system. The grain size alone doesn’t determine the final cost.

Which render thickness is best for my home?

There’s no single answer. Your property’s substrate, architectural style, desired appearance and performance requirements should all be considered. A professional assessment can help you make the right choice.