Cracked and dropped window heads have become more of an issue since the advent of replacement UPVC windows.
It was common practice between the 1900s and 1970s to use structural timber or steel window frames to support the outer leaf masonry above the window. UPVC frames are not as strong and the lack of support causes the masonry to sag and eventually fail.
Shire can retro fit window lintels without the need for expensive demolition of the problem masonry. Whilst it is most common to install a lintel to prevent further structural collapse above the window, in some instances it is also possible to “jack” the brickwork back to its original level, leaving very little evidence of the original problem.