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## Considering Window Weights MC .pdf

Original filename: Considering_Window_Weights_MC.pdf
Author: anil

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Weights used in conjunction with pulleys and sash cord or chain are the traditional and still
best, balancing system for hung windows. The weights counter balance the moving sash and
that equilibrium keeps the sash in any chosen location- from fully opened, to closed and in
between. The weights are hidden within the window frame, in a section called the weight
pocket and connect to the sash using chain or sash cord. Window pulleys allow the chain or
cord to operate smoothly.
Generally, every operable sash requires one pair of weights. For example, single hung sash will
need one pair of weights, double hung two and so on.
When building new window frames, it is easy to designa large enough weight pocket, however
when renovating windows and confined to existing conditions, making sure there is enough
space for the weights is important and can be a tricky process. Changes to the sash or glazing
such as the addition of insulated glass units or laminated glass to previously single glazed
sashduring renovations may alter the sash weight substantially, necessitating the fitting of
additional weight into the existing frames.
A quick rule of thumb is to never use a weight that is greater in section than the sash is thick.
Exceeding this dimension will result in weights that strike each other or hang up when the
window is operated.
Determining the correct weight needed for a given sash is easy. Just weigh a finished, glazed
sash, divide the weight by two and the result is the size of weight needed for each side. The
more complex calculation is to figure whether (and this becomes more problematic the heavier
the sash) adequate weight can be fit into the available weight pocket space. Round weights do
not utilize all available space in the pocket.This might have been ok when the original single
glazed units were designed, but reglazing can quickly render round weights insufficient. You
can’t necessarily just increase the length of the round weight because whenweights become too
long they will bottom out and prevent the full operation of the window.
Weights that are square in section assure that the absolute most weight per given inch of
limited weight pocket length will be used
Stackable window weights are excellent for new and renovated sash. They are flexible, allowing
for incremental fine tuning of the balance system. Since window size tends to vary throughout
a building, an assortment of stackable weights will service an entire project. While some
companies make weights designed to be cut or snapped to the correct weight, this increases
both material, transportation and disposal costs. Essentially, this necessitates throwing some
amount of money away.
SRS Hardware offers 1, 3 and 5 pound,1-3/4” square stackable sash weights atcompetitive case
prices. We have a simple weight request form located at: http://srshardware.com/shop/stackable-

sash-weights. After filling out and emailing the form to us, wecan quickly provide a material and
freight quote.
We are also available to answer questions about window weights, design considerations and other
weighty questions. Click on the contact us button at srshardware.com and we will return your
email usually within the same business day.