Heritage Seal Units


Sealfast manufacture a range of units for use in listed buildings and conservation areas as demanded by local building control.

Please note these units do not comply to Document L Regulations for other types of buildings and small seal depth is not a recommended practice under industry quality control standards.

Units consist of Low E Glass to inner pane, 6mm Argon Cavity with Edgetech Superspacer, Clear or Obscure Glass to outer pane. Seal depth should be 12mm (industry standard) but requests are normally for 7 to 8mm.