Many timber sash & case windows are only locked or held shut by centre fasteners of the type shown opposite.
These can easily be flipped or forced open, as the fixing screws are limited by the size of the window frame. Another inadequate means of securing the windows is the use of dual screws. Dual screws are XXmm long and Edinburgh Sash & Case window frames are typically XXmm thick, so only XXmm of dual screw is holding the two parts together.
Coupled with this over the years the sashes may not meet properly in the middle of the window so the dual screws will not penetrate the inner frame in the centre which again reduces their holding force.
If you are getting window locks fitted to sash & case windows DO NOT fit Dual Screws. We recommend ROLA sash stops which are key operated and don’t rely on the overlap. (see opposite)
A hole is drilled in the window frame and a threaded insert is screwed into the hole. This insert remains fitted to the window , by using the supplied keys the stop is screwed in and out of this insert. The stop when fitted prevents the top and bottom sashes passing each other and thus the window opening.
