🆕roofmaterialvalue

This code list is used in association with the Roof Material Primary Material attribute which is present within the Building Feature Type. The code list provides a list of possible roof material values.

Label	Definition
Fabric	The roof is a material such as PVC, canvas or other fabric, usually stretched over a steel frame. Commonly used in stadium construction.
Glass or Polycarbonate	The roof is formed of a hard, transparent, reflective material, usually supported by a metal or UPVC frame. For horticultural glasshouses, see the Structure Feature Type with classification 'Glasshouse' in the OS NGD Structures Theme.
Green Roof	The roof is predominantly covered with vegetation. Green roofs are usually installed with a growing medium on a waterproof membrane, for environmental reasons.
Metal	The roof is formed of metal sheets, pieces or tiles, for example, corrugated iron, copper or lead. Metal roofs are most commonly found on industrial / commercial buildings and warehouses, small residential out-buildings and on large inner-city complexes with mixed roofs.
Mixed	The roof is comprised of multiple roof materials, where no one class accounts for more than 60% of the roof.
Other	The roof is covered or formed from a non-standard material, for example, wood or a roof top car park.
Thatch	The roof is covered by packed layers of dry vegetation such as straw, water reed, sedge, rushes, heather, or similar material.
Tile Or Stone Or Slate	The roof is covered by overlapping or interlocking tiles, slates or other shaped stone, usually of equal size and shape. Tiled roofs are most commonly found on residential dwellings, where the majority of such buildings are tiled. They can also be found on older industrial / commercial buildings.
Unknown	The roof material could not be determined, for example, due to obscuring vegetation, roof furniture or solar panels. This value is also applied if the building was surveyed after the imagery and height data were captured, so the roof material values will not be derived until new imagery and height data are available.
Waterproof Membrane Or Concrete	The roof is either: • A solid surface covered with a waterproof membrane, including seam-sealed flexible sheets (for example, felt, EPDM), overlapping shingles (for example, bitumen, asphalt) and / or painted on coatings (for example, liquid rubber), to create a continuous watertight barrier. They are often used in roofing systems for flat or low-slope roofs, commonly on blocks of flats and small outbuildings such as garages. This category excludes ‘Fabric’ roof materials. • Constructed from concrete, typically incorporating a mix of cement and aggregates (such as sand and gravel), and often using steel reinforcements for added strength. Concrete roofs are commonly found on blocks of flats, large industrial / commercial complexes and small out-buildings such as garages. When used in roofing, concrete can be combined with waterproofing treatments to enhance its water resistance. Concrete roofs sometimes have structures built on them.