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The finest natural roofing slates from the most reputable quarries, selected to provide a long lasting, beautiful roof with minimal grading and sorting. This range also provides readily available alternatives to long discontinued slates from Wales and Scotland, providing a close match for texture and colour without the slightest compromise on quality.

SIGA Excellence natural slates are ideal for heritage conversion and refurbishment projects and high quality new build and self build projects, with some slates being National Parks approved. All slates are T1, S1, W1 (≤ 0,6%) to comply with NHBC Standards. Excellence slates have exceptional selection with very low wastage and a long life expectancy.

All Excellence slates come with warranties of up to 75 years, terms and conditions apply.

Each SIGA natural slate product has a SIGA number – SIGA 120, SIGA 39 and so on. The SIGA number specifically defines the quarry and selection of slate, guaranteeing traceability and consistency that is second to none.

SIGA 112s

A dark blue grey smooth slate from Spain which has National Parks Approval.

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SIGA 120

A unique, random diminishing alternative to traditional Scottish Slate.

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SIGA 150

An alternative to native green slate which can no longer be sourced. Commonly used on churches.

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SIGA 140

An alternative to indigenous purples slate, sourced from the USA.

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SIGA 39

A very popular slate for use on all projects across the UK, with a pleasing blue grey textured finish.

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SIGA 32s

A textured blue grey slate with National Parks Approval. A good alternative to the popular SIGA 32.

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SIGA 67atg

An attractive blue black slate suitable for use in Scotland on high profile projects. Complies with the Belgian ATG standard.

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SIGA 67nf

An attractive blue black slate suitable for use in Scotland on high profile projects. Also complies with the exacting French NF standard.

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SIGA 32

A textured blue grey slate with National Parks Approval. 7mm thickness commonly used in the North of England, 5mm in the South.

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SIGA 31

A very strong, hard slate with a loyal following in the Northeast of England. Also available in Scottish thicknesses and sizes.

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SIGA 50x

A clean, flat and regular slate with an attractive dark appearance, commonly used in the South of England.

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