St Davnets Hospital. Monaghan. Sash window refurbishment in factory glazing stage on this project for this grade listed 1869 protected building. Due to the listed status, all new windows must comply with conservation area guidelines and our Slim-Glaze brand of double-glazing has been the number one brand choice to complete these projects and fulfil the requirements set by planning officers. These ultra-thin double glazed units have the latest in thermal efficiently, filled with a specialist gas that isn’t used in standard double glazing and with our high performance warm edge spacer can reduce the heat loss up to 77% as when compared to old standard glazing