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Calculating the Amount of Roof Tiles & Slates Required

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30th January 2018

A factor which can vastly change the price of a new roof, or improvements to an existing roof, is the number of tiles used. Before starting work, it's important to know the dimensions of the roof and the type of tile you will be using. Accuracy is key, as the cost can quickly add up if this is planned incorrectly. Read on to learn how to measure your roof and ensure you know how many tiles to purchase. This will keep your project on time and within budget.

How to Measure a Roof

When setting out the measure a roof's area to calculate the materials that will be required, the following three steps are essential:

  1. Measure the Pitch or Angle of the roof slope
  2. Work out the Rafter or Hip / Valley length
  3. Measure the Span (building width) or Run (half building width)

Roof Measurement Guide - Roof Stores
Roof Measurement Guide

Here is an example of how the roofing measurement process works on a basic duo-pitched roof:

Formula: Roof Span ÷ 2 x Roof Pitch Constant for Rafter = Rafter Length

If the Roof Pitch is 35°, the Roof Span is 6.5m wide and the Roof Length is 12.6m - using the reference guide graphic above - the calculation for the slope would look like this:

6.5m ÷ 2 x 1.22 = 3.97 (Rafter Length)

Once you have this information, you can move onto the next stage:

Formula: Area of Slope = Rafter Length x Roof Length x 2 (on both sides of the roof)

With the figures in this example, the calculation would look like this:

3.97 x 12.6 x 2 = 100.04m² (Total Roof Area)

When you know this, you can work out all the materials needed to complete your project.

Roofing Terminology Diagram - Roof Stores
Roofing Terminology Diagram

How Many Roof Tiles Do I Need?

Once you know the square meterage of your roof the next stage is to calculate how many tiles you need. This is determined by the manufacturer as each one works to their own specific dimensions.

The tables for each manufacturer below lay out the essential details for some of the most popular tile variants.

Redland

Redland is an industry-leading provider of tiles and manufactures a vast range of tiles and slates options. These include traditional clay tiles, as well as concrete tiles and man-made slate, plain tiles and pantiles.

Clay Roof Tiles

Type                                                                     Size                           Pitch Tiles/m² 
Redland Cathedral 411 x 265mm 22.5° - 30° 12.5
Redland Old Hollow Pantile 343 x 242mm 30° - 45° 16.3

Concrete Roof Tiles

Type                                                                     Size                          Pitch Tiles/m²    
Redland Saxon 10 Concrete Slate 418 x 330mm 17.5 - 22.5° 9.7
Redland Regent Concrete Tile 418 x 332mm 12.5° -17.5° 16.3
Redland Heathland Concrete Tile 263 x 165mm 35° 55
Redland Renown Concrete Tile 418 x 330mm 17.5° - 30° 9.7

Plain Tiles

Type                                                                     Size Pitch Tiles/m²
Redland Plain Concrete Tile 266 x 165mm 35° 60
Redland Heathland Concrete Tile 263 x 165mm 35° 60

Interlocking Tiles

Type Size Pitch Tiles/m²
Redland Stonewold Mk2 Concrete Slate 430 x 380mm 17.5° 8.2
Redland Mockbond Mini Stonewold Concrete Slate 418 x 334mm 17.5° - 22.5° 9.9
Redland Richmond 10 Concrete Slate 418 x 330mm 17.5° - 22.5° 9.7
Redland Duoplain Concrete Tile 268 x 330mm 25° 17.7
Redland 50 Double Roman Concrete Tile 418 x 330mm 17.5° - 30° 9.7

Sandtoft

Sandtoft is a brand owned by Wienerberger, one of Europe’s largest suppliers of tiles and bricks. This brand is extremely popular and is purchased by homeowners and contractors alike due to its high quality and reputation.

Clay tiles

Type                                                                                 Size                      Pitch       Tiles/m²
Sandtoft Alban Plain Tile 265 x 165mm 10.5° 60
Sandtoft Village Tile 265 x 165mm 35° - 75° 60
Sandtoft Barrow Plain Tile 265 x 165mm 35° - 75° 60
Sandtoft Humber Tile 265 x 165mm 35° - 75° 60
Sandtoft Old English Pantile Tile 342 x 252mm 30° 17.6

Concrete tiles

Type                                                                                 Size Pitch           Tiles/m²
Sandtoft Double Pantile Concrete Tile 420 x 334mm 15° - 30° 10.4
Sandtoft Plain Concrete Tile 265 x 165mm 35° 60
Sandtoft Standard Pattern Concrete Tile 380 x 230mm 17.5° - 30° 17

Plain tiles

Type                                                                                 Size Pitch Tiles/m²   
Sandtoft Plain Concrete Tile 265 x 165mm 35° 60
Sandtoft 20/20 Tile 330 x 226mm 15° - 22.5° 21
Sandtoft Barrow Plain Tile 265 x 165mm 35° - 75° 60
Koramic 303 Sanded Plain Tile 270 x 170mm 35° 57.4
Sandtoft Humber Tile 265 x 165mm 35° - 75° 60

Interlocking tiles

Type                                                                                 Size Pitch Tiles/m²  
Sandtoft Double Pantile Concrete Tile 420 x 334mm 15° - 30° 10.4
Sandtoft Shire Pantile Concrete Tile 380 x 230mm 22.5° - 30° 16.4
Sandtoft Calderdale Dual Concrete Slate 420 x 334mm 17.5° 10
Sandtoft Calderdale Concrete Slate 420 x 334mm 17.5° 10
Sandtoft Double Roman Concrete Tile 420 x 334mm 17.5° - 30° 10

SIGA Natural Slates

SIGA is the market leader in the natural slate sector and supplies beautiful naturally sourced slate tiles. For one of a kind materials to add some true character to your property, this is the range for you.

Type                                              Size Pitch*
Tiles/m²
SIGA 56V Natural Slate 500 x 250mm 25°-30° Dependant on exposure 20
SIGA 62S Natural Slate 500 x 250mm 25°-30° Dependant on exposure 20
SIGA 114 Natural Slate 500 x 250mm 25°-30° Dependant on exposure 20
SIGA 39T Natural Slate 500 x 250mm 25°-30° Dependant on exposure 20
SIGA 37T Natural Slate 500 x 250mm 25°-30° Dependant on exposure 20

*This is the standard recommended pitch for using SIGA tiles. Lower pitches are possible through the use of slate hooks.

How Many Tiles are on a Pallet?

To find out how many tiles will be delivered per pallet, suppliers provide this within their technical information. This is helpful for planning how much space you need to create for the arrival of the pallets at your property.

Each tile type comes in various sizes. This means different size packaging, which will have an effect on the number of tiles delivered per pallet. Once you know the size of your roof space and how many tiles you need, the rest is straightforward.

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