Sash Window Add-On Weights
2 products
2 products
Sash window add-on weights
Round, domed add-on weights that rebalance a double-hung sash window without replacing the whole counterweight set.
Most rebalancing jobs need extra weight, not less. Reglazing with heavier glass adds weight to the sash, and if the counterweights aren’t adjusted the window can become stiff, awkward to open, or drop unexpectedly. Unlike other add-on weights on the market, ours are round and domed to match original sash weights, so they fit seamlessly on top of the existing weight with no friction inside the sash box.
Restoring or servicing a sash window? Get the exact weight you need, not a guess.
Weigh the sash
Bathroom scales work fine for this.
Work out the split
Top sash: add 1 lb (approx. 0.46kg), then divide by 2 for each side. Bottom sash: divide the total by 2.
Add the weight
Our round, domed weights slot straight onto the existing weight in the cavity.
½ lb
Approx. 0.23kg, for fine-tuning the balance.
1 lb
Approx. 0.46kg, for larger shortfalls such as reglazing to heavier glass.
Not sure how much you need? Use the sash weight calculator, or read our full guide to rebalancing a double-hung sash window for the complete step-by-step process. Curious why our weights are round instead of square? Read why we designed our own sash weight.
