An existing bathroom window needed some repair, as well as consideration on how to keep the bathroom warmer. It is a large bathroom with the glass in a steel frame.
The options seemed to be removal of the frame and installing the reworked glass in a double-glazing unit or secondary glazing. The removal of the steel frame would require a whole new frame to be installed. The tile work of the bathroom would be disturbed and need replacement. All this would have involved quite a bit of expense. In addition, the glass panels would need to be reworked into a single panel, requiring quite a bit of alteration.
The secondary glazing option would be almost as effective as double glazing, as the walls are thick enough to have more than 100mm each side of the existing frame. And it would be much cheaper than the encapsulation and associated work.
In either case, there were panes to be repaired, and the whole window to be cleaned.
|Break at left hand corner|
|Break at the right hand corner|
|Break beside a rose motif|
|Missing pane at the catch|
The decision was to go for secondary glazing. Because of the internal tiling, and the large space outside the frame, the secondary glazing was put on the outside. This required a frame to be made for the protective glazing. The glazing had a ventilation slot at the bottom to allow slow circulation of air and avoid condensation on the outside. This is the same concept as the isothermal glazing used in churches. This installation used a minor variation in allowing circulation of air from the bottom only, instead of all around.
The work on repairing and cleaning was conducted at the same time as the framing was done.
|Framing for secondary glazing|
The secondary glazing was attached in such a way that it can be removed for cleaning and decorative purposes.
|Secondary glazing in place|
The finished work shows no effect of the secondary glazing from the inside. The pole for the washing line can be seen clearly.
The outside of the house shows no significant difference with the secondary glazing in place.