Someone with a basement flat with old wooden frame vertical sliding sash windows wants some simple to fit security device to enable the window to be left open safely a couple of inches whilst no one is in the flat.
Grateful for an suggestions on a simple to fit device.
my parents' home had what was referred to as a "Burglar catch". This was a dropdown bar recessed into the upper sash when not set. This dropped down with a gravity locking mechanism and prevented the lower sash opening more than a preset amount. I've also come across a tapped plate, againe recessed into the upper sash, into which you could screw a peg to prevent the lower sash getting past. the first is neater and has no parts to get lost. I'm sure any good architectural ironmonger will stock them.
As the window opens, the lower sash covers the bottom part of the plate which strengthens the retention of the stop if the window is forced.
Ditch the screws they come with, they are too weedy, I think I used 1
1/4" x 10 or possibly 12 to make them a bit more secure.
Always fit in pairs.
With respect to your friend I wouldn't leave any windows open when a place is unoccupied, whatever the security fitted. IMO it attracts the attention of thieves and once they take an interest they will find a way in.
That's fine, except that you'd need to force your way past whatever was holding them in place in the event of having to do any maintenance, such as replacing the sash cords. This would probably severely damage the frame, necessitating new windows...
Sash windows are not a good choice for a fire exit. A second door is much better and all the basement flats that I know of have both front and back doors.
HomeOwnersHub website is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.