Cotton sash cords are made in different gauges between 6 and 8 mm diameter. The thicker cords require larger pulleys and the following table indicates the size of the pulleys recommended.
Sash weights are made of cast iron or lead in round and square section, although round section cast iron weights of 40 mm diameter are normally used. They are made in various weights to suit sashes of different sizes. Weights are chosen to balance the sash and at the same time to ensure that the sash will tend to close rather than open if vibrated by the wind.
The combined weights for the upper sash is made 0. Villa windows operational service will ensure your balance weights are weighted correctly for your sash window. Spiral balances incorporating helical torsion springs were introduced into New Zealand during the nineteen forties and they have largely replaced counterweights and cords for balancing double hung windows.
Most of the spring balances used in New Zealand are Unique patent spiral balances. By retrofit double glazing your timber windows you not only pay approximately a third of the cost of new double glazed windows, but you greatly reduced costs in the long term as well due to the incorporation of a full drainage system. This allows your retrofitted windows to last far longer than your typical double glazing system because no moisture can get trapped in the window rebate rotting the window from the inside out or causing the IGU to deteriorate and fail.
If you have wooden sash windows, you may need window restoration or repair on top of the double glazing. The new wooden joinery itself is also going to cost a lot, which can increase the price even more.
With the advancements in window technology today, you can achieve all your objectives — and more — whilst staying well within your budget. However, you can pay about one-third of that amount if you have your sash windows retrofitted instead of paying for a full window restoration. Secondary glazing will cost about the same amount as retrofit double glazing.
At Thermawood, when we retrofit double glazed sash windows, we re-weight the windows to accommodate the addition of the IGU. This is a standard part of our process, and, we believe, an essential part. After all, your windows should work like new after being double glazed. New wooden sash windows are more expensive than other types of windows or windows made from other materials. This is why the cost of new double glazed windows compared to retrofit double glazing is so much higher when you are dealing with timber sash windows.
This is why retrofit double glazing is such a sensible choice. Sash restoration will add to the cost of double glazing because most window companies are not experienced with sash window repair and restoration.
As we work with older windows all the time, we actually include window refurbishment in the process. Even if you have century-old sash windows, you still can enjoy a cost-effective window upgrade.
When you work with a company that understands the needs of wooden sash windows, you can have the benefits of modern double glazed windows and the charm and character of your original timber sash windows. When you get the best value, double glazing your windows can be a remarkably worthwhile investment, especially with a window system that is designed to last for decades.
Different than double glazing, this is where a secondary window is put in. This method often ends up making the windows look different, not able to open, and may not be heritage approved. You get to keep the original charm and also prevent the cascading problems of moisture build-up around your windows — mould growth, compromised indoor air quality, and damaged or warped wooden frames or sashes due to the specially designed and patented drainage system incorporated within the system.
A process over 30 years in the making and the result of years of problem-solving the issues that almost always occur from conventional double glazing and insulating window products, Thermawood Retrofit Double Glazing works like this:.
As a result, your windows still look like they are straight out of the Edwardian or Victorian era, but they will keep your home comfortable, dry, and blissfully quiet, as any modern home in the 21 st century should be. Download Now. We are still open for business We are taking every precautionary measure to keep our staff and customers safe during this challenging time. This is what you should think twice about before investing your money: Installing draft seals.
A process over 30 years in the making and the result of years of problem-solving the issues that almost always occur from conventional double glazing and insulating window products, Thermawood Retrofit Double Glazing works like this: Using special tooling, a small piece of the original timber frame is removed to create a degree angle, along with the old glass.
The following is a pricing guide only. Traditional windows Standard windows are typically mm high including the head and sill frame and sash widths are typically up to mm wide. Double hung windows Standard windows are typically mm high including the head and sill frame and the sash widths are up to mm wide.
Gallery Have a look at some of our double hung and traditional timber window work. What our clients say about us. We heard about Well Hung Joinery through several people in the Wairarapa who had used this Wellington-based company for either renovations or new builds.
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