Holdens Supaslim is designed for timber window manufactures looking to produce a thinner, more discreet profile window e.g sash windows with glazing bars for specialist applications or in conservation settings.

According to English Heritage ” Many historic windows, frames and glazing has fallen victim to inappropriate double glazing replacements” Supaslim units are virtually indistinguishable from single pane glazing once puttied into a window. They are therefore eminently suitable for “conservation” or “listed buildings” providing replica windows yet with all the benefits of modern insulated double glazing.

Addressing the need for a solution to champion the UKs rich tradition of different window designs and materials through the ages, Holdens Supaseal have developed the Supaslim.