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2018 National Home Improvement Estimator, All Rights Reserved Page 152

Counterweighted Windows
Quality wood windows built before about 1930 had sash balances inside the wall, usually two weights,
one on each side of the window. See Figure 8-8. The weights and the window were perfectly balanced
so the window would stay put when opened to any height. Most likely, at least one pulley and rope
failed many years ago. Now, the only way to keep the window open is with a stick supporting the sash.
Even worse, the balance mechanism may still be working on just one side. That immobilizes the sash
at nearly any height.

If sash balances have failed on an otherwise sound window, consider installing a new spring balance or
replacing the broken sash cord. Installing a spring balance only requires removing the parting strip and
stops. Follow the spring balance manufacturer’s installation instructions. Then replace the stops.

Replacing broken balance ropes is simple, but not easy. The weights are difficult to get at. Working
from inside the house, remove the inside stop. Back out screws or carefully pry out the small nails
anchoring the stop. Once loose, lift the sash and swivel it out of the window frame. With luck, you’ll only
need to remove the stop on one side of the window.

If you see a little access cover under the inside stop on each side of the window, remove the cover to
expose the channel where sash weights are supposed to operate. If you don’t see an access cover, pry
off the outer casing boards on each side of the window. Be careful not to crack the casing. Casing is
usually attached with 4” trim-head nails. If these have rusted, they can be very hard to get loose. Don't
put too much pressure on one spot. You'll either break the trim board or knock a hole in the wall. Work
all around the board until you get it loose.

When the trim board is off, you won’t see any weights. But have faith, the weights are in there. The
window was installed before the furring strips and plaster went on. The outer casing boards were put on
top of that. The weights are under the furring strips.

You'll need to cut through the plaster and furring strips at the bottom of the window frame. Don't worry,
the hole won't show once you put the trim board back on. Cut carefully to avoid breaking any big chunks
of plaster loose.

You may not see the weight at first. It's recessed a little below the bottom edge of the window frame.
That's to give it someplace to go when the window is all the way up. If you stick your fingers into the
hole, you'll feel the top of the sash weight. It's usually a rough cast-iron cylinder with a loop on top for
attaching the sash cord.