Repairing Double Hung Sash Cords

Pocket Doors and Sash Weights

The first time I got to this stage, I’ll confess it was a bit of a mystery.  I’d read a few online articles and understood that there were perfectly sized counterweights somewhere in or around the window that would allow the sadh to be placed at a specific height and not move up or down.  There were many things I wasn’t clear on though:
  • where were these sash weights – it certainly wasn’t obvious and you couldn’t eyeball them anywhere – i had considered the prospect of taking the entire window system apart which seemed daunting
  • what did the they look like, did i have to replace them, or could i fix them, what if one of them was missing
  • how many of them were there – i may have though there was only 1 weight – turns out there are generally 4 of them and occasionally 6 of them on sets of double hung windows. We’ll discuss too of them in this article.
  • what did i have to do to make them useful again – i could imagine but a picture is worth many words or text blogs
Turns out that many of these window systems have a fairly ingenious hidden door that allows you to directly access and fix most sash weight issues. You may not find it very cool but I sure did.
So lets have a look:
have look on the window frame (just exposed when you removed the stop) for a small screw set into the middle of the wood. It will be very flush but it likely won't be painted. Unscrew this screw! In other windows it could just a pressure fit (so no screw) or the screw is mounted on the wall side of the window rather than on the interior window side.
With a little very gentle persuasion you'll find an entire door - almost 12 inches high - in the side of your window. Remove this door carefully. Its a snug fit and has been a fine piece of carpentery in every window I've worked with it.

 

this is what the inside of  the window casing looks like. From left to right you can see the Window Trim (in white), a red vapour barrier, in this case behind the wall board on the inside of the wall and infront of some old plaster walls that were there originally. Then a gap and if you squint you'll see a piece of old sash cord sticking up.

 

give that loose cash cord a gentle pull and you'll be able to gently pull the sash weight out of the cavity that extends beneath the window.

 

and here you see a full sash weight (heavier than you think) - i suspect this one is cast iron, its got a nifty notch for tying the weight to the sash cord -  this one had the weight of the sash cast in letters into the weight. 6 lbs if i recall. Its dusty will have insulation on it (hopefully) and you don't want to lose it. Don't let it roll out the window.

 

and then do the same thing on the other side of the window - removing the door and taking the sash weight out.