wood double hung windows sticky

Question

I own a house in Flagstaff Az that was built in 1940. It still has its original wood divided light double hung wood windows. These were built by TM Cobb Co and used Unique Balance sash support system.

The first photo shows the support tube with both window sashes in the closed position.

The second shows the attachment of the spring tube to the bottom of the sash.

The third shows the attachment of the top of the tube to the window frame.

Amazingly these are still functional but can be sticky. I am hoping that you might be able to tell me if there is any maintenance / lubrication recommendations that you might suggest.

Any other information you might have on this product would be greatly appreciated.

Tom · Accepted Answer

Hello! When it comes to old windows like this, my go-to is always going to be the Series 500 spiral balance, along with the 17-012 bracket (sold separately). This combination is very versatile and in my experience is a great choice for older wood windows.

Just note that the diameter of the Series 500 is 9/16", so your next step is to determine whether you have the room to install this already, or if you have to make room. After that it's just a matter of determining length and spring calibration, which is just a matter of measuring the old balance and weighing the sash on a scale, respectively.

Please let me know if you had any other questions and I would be happy to assist you.