If you are an architect or interior designer working on a heritage building, you are likely to run into some timber windows.
This page provides:
These windows are most commonly:
They may be beautiful, but they are also likely to be:
When specifying improvements to these windows, most people want a combination of:
Download a link to a pdf here, or copy the text below.
It is usually, but not always, possible to reuse staff beads and parting beads. Unless the windows are of high heritage value, you might prefer to specify all new staff beads and parting beads. The cost of replacement is similar to the cost of re-use. Painting to an even finish will sometimes be easier on fresh bead. If lead paint is present, it can be safer to dispose of the beads responsibly rather than reuse, because reuse involves more disturbance of the old paint.
Other possible specifications
Carefully remove and retain staff beads, bottom sashes, parting beads, and top sashes for re-use. Provide replacement parting beads and staff beads to match original where necessary.
Replace all staff beads and parting beads with new. Carefully remove and retain bottom sashes and top sashes for re-use.
When re-glazing old double-hung windows, you need to take into account the thickness and weight of the new glass.
Thicker glass has the following implications for old windows:
Heavier glass has the following implications for old windows:
Suggested Additional Specification
For improved thermal performance, the above draught sealing specification should be adequate. However, if your client is concerned about acoustics, further improvements can be made by installing a second row of draught seals wherever possible. This second row of draught seals provides a surprising improvement to overall noise reduction at almost no extra cost.
Windows are to be fitted with secondary draught seals wherever possible. In double-hung windows this means in the bottom of the bottom rail, the top of the top rail, and (if possible) a second seal in the meeting rail. In casement and awning windows, this means a second seal around the perimeter of each sash OR a secondary seal in a bead mounted on the interior face of the window frame.