Double hung window insulation

Question

I also want to replace the insulation on my windows while I have them apart. The house is 20 years old with double hung wood windows with vinyl compression jams and coil spring balances.

There are 20 windows and I need about 175 feet of the insulation. the insulation in it now has a 1/4 inch kerf bulb and is hollow. The tang that goes into the window is 1/4 inch long making the whole unit 1/2 inch tall. Should I stay with that or go to a foam filled insulation.

Any help would be appreciated

Thanks

John

Casey · Accepted Answer

Hello,

Based on your photos and dimensions, our closest replacement option would be the 58-053 shown below. Note that the bulb has a diameter of 5/16" rather than 1/4" but your seal could have compressed a bit over time. Take a look and let us know if you have any other questions. Thank you!

Profile drawing of the 58-053 bubble seal.