Town and Country lantern roofs are designed to be fixed onto a curb-like detail which rises proud of the supporting flat roof assembly, precisely at the open edge of the lantern aperture.  This curb is called an upstand, the outside face of which allows the flat roofs external surfacing to lap up and form a weather-tight junction.

Whether creating an aperture within an existing flat roof, or detailing one within an entirely new construction, all works associated with the supporting flat roof, the formation of the upstand, external weathering finishes and internal linings and decorative finishes, are to be performed by others.

The accompanying drawing shows a typical section through an upstand at the aperture within a flat roof. 
Town and Country`s bespoke perimeter parapet/box guttering is also available; details by separate consultation.

Section


Materials and works to be carried out by others:-

  1. 2No 50mm by 175mm joists – (The size of the joists will vary depending on the their span.  Steel channels or I-beams will be required on very large projects.  Always consult a structural engineer).
  2. 50mm by 175mm joists – (The size of the joists will vary depending on the their span).
  3. 1No 75mm by 175mm upstand piece.
  4. 1No 75mm by ?mm packer.
  5. Firring pieces of diminishing depths to create a fall to the roof weathering surface.
  6. 12mm exterior grade ply.
  7. 75mm high-performance foil-backed insulation.
  8. 12mm exterior grade ply.
  9. 12mm exterior grade ply.
  10. Angled fillet.
  11. External weathering finish to individual preference, e.g. asphalt or three-coat mineral felt.       (If lead the flat roof assembly will be different).
  12. 8mm tolerance gap.
  13. 19mm plasterboard and skim plaster finish, or, panalled timber lining to individual preference.
  14. 9mm plasterboard and skim plaster finish.
  15. Code-5 lead upstand flashing

    Components to be installed by Town & Country:-

  16. Roof lantern sill/plate.
  17. Bull-nose detail.
  18. Rafter.
  19. High-performance glazing unit.
  20. Aluminium skirt
 
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Design Office: 61 Lambeth Walk, London SE11 6DX • Workshops: Dereham, Horningtoft, Norfolk NR20 5DJ
T:020 7091 0621 • F:020 7091 0622 • www.TownandCountryUK.com
Fine Glass Buildings Limited © 2012