The Duquesa Prime is a Spanish slate quarried in the highly regarded La Baña region of Northern Spain.
Its distinctive Hebra riven texture and blue/black colour make it a popular choice for Roofing contractors, self-builders and Architects.
The Duquesa Prime is available in a 5mm and 8mm thickness.
Prime Grade slates are of a high quality and good selection, they will require slightly more sorting and grading prior to fixing than the Ultra-Grade, but once done Prime-Grade slates offer a cost-effective solution that will still achieve a flat, uniform appearance on the roof.
Test results: The Duquesa slate boasts a W-1, T-1, S-1 rating, meaning it conforms and surpasses all the top UK tests for water absorption, thermal cycle resistance and sulphur dioxide exposure.