How do you weigh a sash window?
Gently slide upper or lower window sash onto the scale and allow its full weight to rest on the scale. Read the weight on the scale and divide this number by two. This is the amount of weight needed for each side of the sash. Example – Sash weight = 11 pounds.
What are the weights on a sash window usually made from?
Since square steel weights are denser than their cast iron cousins you are able to apply a larger weight to the same size window, to compensate for heavier material sash windows. We stock a huge range of steel weights starting at 6lb, All of which are always in stock and can be delivered the next day.
Do all sash windows have weights?
Sash windows work on a pulley system. The timber sash windows we build and install are made up of many individual parts that all contribute to the unique aesthetic of these beautiful windows. A typical sash window has a sill, top and bottom rails, timber linings, sash weights, and cords.
What are windows with weights called?
Double-hung windows are usually either operated by a weight and chain system or spiral balance system. Windows operated by weight and chain, or sometimes called weight and pulley, have a chain (or cotton cord) that connects the sash to a weight that is concealed in the wall next to the window.
How heavy should sash weights be?
Add 2lb to top sash total weight (1lb each side). The counter balance weights must be heavier than the top sash to ensure the top sash always stays tightly shut with no gaps where the top rail touches the top pulley stile.
How do you calculate window weights?
Once weighed all you have to do is add one pound onto the total and divide by two and this is how much weight goes on either side of the window. For example if the window weighs 43 pounds the result would be 43 + 1 = 44/2 = 22 pounds on each side of the window.
Are sash weights lead?
Lead window sash weights are becoming the choice by many contractors over steel cast weights due to the space savings obtained. Lead is approximately 40% smaller in size than steel and lead is non rusting material. Lead counterweights can also be easily cut on site if required and reused for other weights.
How heavy are sash weights?
The 1 lb., 3 lb., and 5 lb. sizes permit flexibility and precision in attaining a proper balance. They are suitable for 1 3/4″ or larger sash in either new construction or retro-fit. Individual sash weights may be ordered below for $3.75/lb.
Do UPVC sash windows have weights?
The modern UPVC sash windows we install use the same counterbalance principle as timber sash windows but the weights, cord, and pulley system are replaced with a spring balance system known as the torsion balance.
Why are sash windows called sash?
MOST probably, sash windows were not ‘invented’ but developed from the simpler horizontal sliding sash (known today as the ‘Yorkshire’ sash). They are supposed to have come from Holland in the seventeenth century.
Do modern windows have weights?
Today, modern windows do not use weights, and they are made of a variety of materials including wood, vinyl, and aluminum. The purpose of a double hung window was to help with ventilation. The top sash could be lowered, allowing the hot air to leave the house, while the bottom sash was raised to allow the cool air in.