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Calculating Fibre Cement Slates for Your Roofing Project

Updated December 28, 2023
Calculate the exact number of fibre cement slates per m2 in the UK & save time & money with this handy guide.

When planning a roofing project with fibre cement slates, one critical question often arises: "How many fibre cement slates are needed per square meter?" This post will guide you through the factors that affect this number and how to calculate it accurately for your project in the UK.

Understanding Fibre Cement Slates

Characteristics of Fibre Cement Slates

Fibre cement slates are a popular roofing material due to their durability and ease of installation, which is made from cement and fibre, that makes them lightweight and strong.

Estimating the Quantity

Standard Slate Sizes

In the UK, fibre cement slates come in various sizes. The most common size is 600mm x 300mm, but other sizes are available to suit different styles and requirements.

Calculation Factors

The number of slates needed per square meter depends on several factors:

  • Slate Size: Larger slates cover more area, reducing the number needed.
  • Roof Pitch: Steeper roofs may require more slates for adequate coverage.
  • Overlap: Slates must overlap to prevent water ingress, influencing the total count.

Average Slate Requirements

General Estimates

On average, for standard 600mm x 300mm slates, you'll need approximately:

  • 10 to 13 slates per square meter for moderate pitches.
  • Additional slates may be necessary for steeper pitches or specific design considerations.

Tips for Accurate Measurements

Measuring Your Roof Area

To estimate how many slates you'll need, first measure the total roof area in square meters. Then, account for the required overlap, which is typically about 75mm.

Consult Manufacturer Guidelines

Always refer to the manufacturer's specifications for the best practices on overlap and coverage. They can provide the most accurate figures for their particular slate dimensions.


Your roof and measure it carefully  before you purchase the cement slates to ensure the correct amount of purchase. Also make sure you consult with professionals before the purchase to make sure the accuracy of the purchase.

Frequently Asked Questions (FAQs)

Knowing the number of slates per square meter is crucial for budgeting and ensuring you purchase enough material to cover your roof without significant surplus.

The most common size for fibre cement slates in the UK is 600mm x 300mm, but sizes can vary, so check with your supplier for their specific dimensions.

Measure your roof area in square meters, then multiply by the number of slates needed per square meter, considering the overlap.

Yes, steeper roofs may require more slates per square meter to achieve the necessary overlap and coverage.

A typical overlap is about 75mm, but this can vary based on the slate size and manufacturer's recommendations.

It's standard to order an additional 5-10% beyond your estimated needs to account for cutting, fitting, and potential breakage.

Quality doesn't directly affect quantity, but high-quality slates are less likely to break during installation, which can reduce wastage.

Fibre cement slates are considered a more environmentally friendly option compared to some other roofing materials, due to their durability and the sustainable materials often used in their production.

Yes, one of the advantages of fibre cement slates is that they can be individually replaced if damaged.

While you can estimate the number yourself, it is always recommended to consult with or hire a professional to ensure accuracy and account for all variables in your specific roofing project.


Richard Renderman, your trusted rendering expert at MidRender, is passionate about the art of rendering. With years of experience,he crafts…

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