Historical & Geological Context
Quarried on the Isle of Portland in Dorset, Portland Stone was chosen by Sir Christopher Wren to rebuild St Paul's Cathedral after the Great Fire of London. Known for its exceptional structural strength, crisp carving definition, and white weathering under rain, it remains the standard stone for monumental civic and classical estate architecture.
Petrographic & Geological Characteristics
High-purity oolitic limestone (Tithonian stage of Upper Jurassic), exceptional weathering resistance.
Lime Mortar & Breathability Compatibility
Bed with traditional non-hydraulic lime mortar or moderately hydraulic lime (NHL 2). Avoid hard cementitious pointing.
Provenance & Historical Sourcing
Isle of Portland, Dorset Jurassic Coast (UNESCO World Heritage).
Condition Report & Patina
High frost resistance, excellent resistance to urban pollution.
Portland Stone (Basebed, Whitbed & Roach)
Dorset, United Kingdom (GB)
Non-commercial reference. Not sold or brokered by Le Cercle du Roi.
This material dossier is compiled from public geological surveys, heritage conservation research (BRGM, CTMNC, Historic England, Monumentenwacht), and historical treatises. Inclusion does not constitute a sales offer by Le Cercle du Roi.