New Channel Balance Parts for Lawson Windows

Question

Hi!

I have about 6 or 7, maybe more (need to check them), Lawson windows (non-tilt) that need new channel balances. The windows are about 11 years old. The plastic parts are breaking, or the string or some have the small metal pulleys cracking and breaking. Should go for replacing the entire assembly or purchase just the individual parts to repair them? I'm pretty handy and have a complete workshop. What would you recommend? Also, I can see model # stamped in the channels like 3550 and 2940. Should I go for a heavier option and get a 2950? These windows seem pretty heavy to lift and are far from smooth opening. We had the house built and they've never been the best windows. I suspect these are super cheap windows. Just looking for the best, recommended option at this point. Lastly, should I wait for the other windows to break or be proactive and just start replacing all of them? We have 20 windows in total.

Looking for your recommended approach to these.

Thank you,

Mark

Casey · Accepted Answer

Hi there, Mark! Sounds like you're in the market for new balances. When parts on the balances start breaking, we normally suggest replacing the entire system. We can help determine what you need if you want to send us over some photos showing the entire length and close-ups of the plastic attachments.

As far as the "3550" and "2940" stamped on your channels - they correspond with the spring strength, so we suggest sticking with the original strength. If you want to double check yours, just weigh the bottom sash on a bathroom scale to make sure you are getting the right weight range.