How Much Overhang Should a Coping Stone Have?

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Peter Overton
WRITTEN BY
PETER OVERTON

Accompanied by over 30 years of experience within the external construction sector, my skill set extends to many areas.

Copings are essential for weatherproofing, projecting water away from the wall. But, do you know the ideal specifications for your project? Before you buy a set of wall copings, make sure that you know how much overhang you need, and what materials are best suited for your project.

So, how much overhang should a coping stone have? We recommend an overhang of 23-35mm on each side of wall copings for the drip channels. This may vary slightly based on the size of your copings, but it would be easy to scale up down from this range as appropriate. 

Keep reading to learn more about how much overhang a wall coping should ideally have, as well as the ideal thickness, width and materials for wall copings.

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How Much Overhang Should a Coping Stone Have?

As an absolute minimum, ensure to maintain a 10mm overhang for wall copings. Although, as a general guideline, we recommend an overhang of  25-35mm to account for drip channels. 

However, coping stones usually come in a variety of sizes and, as such, the amount of overhang required will vary. You may also want to consider design and aesthetics when planning how much overhang to give your wall copings.

Whilst it may affect the overall look of your wall, the greater the overhang is, the greater the protection your wall has. 
Learn how to properly install aluminium wall copings in our recent blog here.

Do Coping Stones Need a Drip?

Coping stones absolutely need a drip channel to help encourage water away from the wall. When you purchase coping stones, ensure that there is a drip channel moulded into the side length of the coping – this channel ensures that when water moves down the coping, it drips off rather than running under the coping where it can damage the wall. 

Drip channels are often 5mm deep and are cut or moulded 25mm inside the underside of the coping, along the long edge.

How Wide Should a Coping Stone Be?

The width of your coping stones will depend entirely on the size of your wall, however, most coping stones will come in a wide range of sizes and widths to suit. Some companies will even offer bespoke sizing to meet your exact requirements. 


At Kladworx, we offer our aluminium wall copings in widths from 182mm right up to 1022mm. We also offer a wide range of different shapes and sizes in 25 different colours to help you create the perfect finish on your project.

How Thick Should Coping Stones Be?

The height, or thickness of coping stones, depends on the materials used. Once weathered stones are different heights across the project in order to form a gentle slope that encourages water to flow away from the wall. Common sizes include 90mm to 75mm, 75mm to 50mm, and 65mm to 50mm.

Twice weathered coping stones are usually between 75mm and 100mm, depending on the width of the base of the stone. 

Our Alumasc aluminium coping stones range from 2mm thick to 3mm thick. Get in touch with us to learn more about our range of aluminium wall copings; our experts will be happy to help you determine the best products for your project.

What Material is Used for Copings?

Various stone materials are available as coping stones, from high strength concrete, brick, clay, terracotta, cast stone, tile, or slate. They can also be made from wood and thatch. However, we recommend aluminium coping stones for their durability, weight, and appearance. 

Aluminium coping stones are incredibly durable and strong, as well as being resistant to corrosion. As such, they usually last far longer than stone copings, and are far easier to install due to being fairly lightweight. 

Read our blog about Stone Copings Vs Aluminium Copings to learn more about this, and to decide which material would work best for you.

Skyline-Coping-Installation

Aluminium Wall Copings at Kladworx

Kladworx offers a range of Alumasc aluminum copings that are made specifically for each project, to individual specifications. From 3m length aluminium wall copings , to junction wall copings, stop end wall copings, and 90 degree angle wall copings (all available in a variety of widths and colours).

Get in touch with us today to discuss your project. We offer tailored advice, and can also provide a site survey in London and across the South East to ensure that you get the best materials for the job.

Need help with your external construction project?

We are suppliers of some of the most bespoke aluminium and uPVC systems on the market. With over 30 years of experience within the external construction sector, it leaves us well placed to offer our advice on the many different systems on the market

See some of our recent work, or get in touch with us today for a free, no obligation quote.

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