Preserving period feature picture rails and moulding in window reveals

That crooked old house - the devil’s in the detail


Secondary Glazing in Practice


retrofitting, refurbishment and conservation, fixing methods

Following on from our blog ‘Splayed reveals and the odd leg’ where we learnt how the Selectaglaze odd leg frame and timber grounds lend themselves to treating openings of all shapes. Buildings of a certain age, and we know we are not just talking about old buildings! Often have walls and window reveals which are not plum, true and level or maybe have period features such as picture rails and mouldings protruding into the window reveal. How to treat a tapered window reveal Whitehall Museum Cheam, required scribing to accept the secondary glazing into uneven reveals These can be a challenge for most secondary glazers, but not for Selectaglaze. Selectaglaze secondary glazing systems have an odd leg frame ie. the room side of the frame is bigger than the cavity side. This is because it is designed to be installed into timber grounds fitted to the window reveal. Fig 1. shows how the timber ground can be tapered to suit a reveal which is not plumb or level. This does mean that each window has to be treated as an individual, this takes more time and effort but only by doing so can you maintain the close fitting tolerances required to ensure optimum performance. tapered reveal - diagram showing how timbers can correct taper Figure 1: diagram showing the tapered timber to the left hand side of the reveal Similarly, fig 2. shows an enlarged timber ground to scribed around a picture rail, again offering a seamless solution to ensure we retain a much beloved historic feature. Picture rail and architrave - figure 2  Figure 2: enlarged timber to enable scribing round an architrave It is this design which affords so much flexibility when dealing with reveals which are out of plumb and true or which have period features, allowing these architecturally important details to be retained in their original form.