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 S1, T1, W1 (≤ 0,6%) to comply with NHBC Standards.

All Excellence slates come with warranties of up to 100 years, terms and conditions apply.

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 Commercial Natural Slates come with a 75 years Warranty, terms and conditions apply.

Affordable natural roofing slates of good overall quality make the SIGA Classic range ideal for budget conscious projects. Although they require more sorting and grading to produce a good roof finish, all SIGA Classic roof slates must meet the same strict testing and certification criteria as the higher grades.

SIGA Classic range of natural slates are ideal for conversion and refurbishment projects across the UK, and are NHBC compliant making them particularly suitable for new build housing. Wastage is a little higher than the Commercial range.

All our SIGA Classic slates come with a 50 years Warranty, terms and conditions apply.

SIGA Galiza range is a very smooth slate, sourced from the Minas Gerais region of Brazil and comes in 2 colours – Graphite and Grey/Green.

Produced from a sedimentary stone this range of slate achieves the required conformity to BS EN 12326-1:2014 – T1/S1/W1 and has a 30 Year Warranty (T&C’s apply).

SIG recommend Galiza slates to be hook fixed with all perimeter areas and abutments nailed fixed.

Individual hand crafted alternatives to Cotswold natural stone and Collyweston and Swithland natural slates, reflecting the rustic beauty of the originals.

A reproduction roof slate providing all the look and feel of weathered natural reclaimed slate but with a 25-year guarantee and no shortage of supply.

SIGA Man-Made Smooth Square Edge fibre cement roofing slates have a smooth surface with square edges. An ideal option if looking for a cost-effective alternative to natural slates.