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A range of good quality natural roofing slate, ideal for the refurbishment and volume housing developer market. Commercial slates are recommended for experienced slaters, as thickness and quality can be more variable than the Excellence range, so careful sorting and grading is recommended for the best aesthetics.

All slates are S1, T1, W1 (≤ 0,6%) to comply with NHBC Standards. Wastage, while still very reasonable, is generally a little higher than the Excellence range.

All our SIGA Commercial natural slates come with a 30 Year Warranty, 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 54x

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

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SIGA 13s

A dark blue grey smooth slate from Spain similar to SIGA 112s, with a fine vertical grain. Often used on self build projects.

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SIGA 62m

A first selection slate from the La Bana Region with a fine vertical line. Smooth, blue grey and slender - suitable for projects in the South and East of England.

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SIGA 65

A first mixed selection textured blue grey slate from a very popular quarry, suitable for all project types except in Scotland.

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SIGA 65v

A consistent, economical and smooth natural slate. Ideal for new build housing projects covered by NHBC warranties in the South, West and East of England.

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SIGA 35

A heavy textured 8mm blue grey slate very popular with housebuilders in Scotland.

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SIGA 37

A very popular slate for use across the UK, with a pleasing blue grey textured finish similar to SIGA 39.

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