Tillie Doyle
Glazing putty is a versatile product that has been used for centuries to install glass into windows. While it began to fall out of favour in the 1950s and 1960s, it is still used for window restoration today. Dual Glaze is a popular glazing putty that can be used for spot glazing touch-ups and can be applied outside or in a shop. It is oilier than other putties, which makes it messier to work with, especially on hot days. Dual Glaze also takes a long time to cure (2-3 weeks). However, this slow curing process means it stays flexible much longer than its competitors. Dual Glaze can be used to glaze dual-pane windows, which are also called double-glazed windows.
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What You'll Learn
Dual pane windows are more energy-efficient than single-pane windows
Dual-pane windows, also known as double-glazed windows, offer several advantages over single-pane windows. One of their most notable benefits is improved energy efficiency. By upgrading to dual-pane windows, you can achieve significant energy savings and reduce your heating and cooling costs.
Single-pane windows, commonly found in older homes, have a single layer of glass. Over time, the putty or glazing compound that holds the glass in place can harden, crack, and even fall off, leading to drafts and reduced energy efficiency.
On the other hand, dual-pane windows feature two panes of glass with an insulating gap or gas between them. This design creates an air cushion, enhancing insulation and preventing drafts. As a result, dual-pane windows provide better temperature regulation, keeping your home warmer in the winter and cooler in the summer.
The improved insulation offered by dual-pane windows translates directly into energy savings. With better temperature regulation, your heating and cooling systems won't have to work as hard to maintain a comfortable indoor environment. This reduction in energy consumption leads to lower utility bills, helping you save money in the long run.
Additionally, dual-pane windows offer noise reduction benefits. The extra layer of glass and the insulating gap act as a sound barrier, reducing outdoor noise infiltration. This feature can be particularly advantageous if you live in a noisy or busy area, improving your overall quality of life and comfort.
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Glazing putty can be patched and doesn't require full removal of the sash
Glazing putty is a versatile product that can be used to seal the individual panes of glass in wood, steel, and aluminium windows. It can be patched as part of its maintenance cycle and does not require full removal of the sash for re-puttying. The work can be done on-site with appropriate glazing putty such as Dual Glaze or Austin's Glaziers Putty. New glazing putty will adhere to the old putty, so it is not necessary to remove all of the old putties. However, a good portion of the old putty should be removed before re-glazing to avoid an unsightly appearance.
When removing old glazing putty, it is important to avoid putting pressure on the glass. The putty can be softened using infrared heat, steam heat, or a wallpaper steamer, making it easier to scrape off with a putty knife or 5-in-1 tool. A utility knife can also be used to wedge between the putty and the sash to pop out the putty without touching the glass. For softwood sashes, a sharp chisel can be used, but it is important to go slowly to avoid breaking the glass.
After removing the old putty, the window frame can be primed with a shellac-based primer such as Zinsser BIN, which dries quickly. If new glass is needed, accurate measurements of the opening should be taken, subtracting 1/8 inch for the new glass to be cut to size. Glazing points can be used to hold the glass in place while the new compound hardens. The glazing compound is available in oil-based and latex/acrylic versions, with latex having a longer life expectancy and not requiring days of drying time before painting.
Dual pane or double-glazed windows provide twice the energy efficiency of single-paned windows due to the air cushion created between the two panes, which improves insulation and prevents drafts. While glazing putty is typically used for single-pane windows, it can also be used for dual-pane windows as a versatile product. However, modern dual-pane windows often use glazing gasket systems instead of putty.
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Latex-based glazing compounds can be left unpainted
Glazing putty is a versatile product that has been used for centuries to install glass into windows. While modern windows may use glazing gaskets, caulks, or wood glazing, older windows tend to use glazing putty, particularly those with wood frames.
When it comes to glazing compounds, there are two main types: oil-based and latex-based. Latex-based glazing compounds, such as DAP Latex Window Glazing, offer several advantages. Firstly, they can be left unpainted, providing a smooth finish that resists sagging, cracking, shrinking, and chalking. This is particularly useful for those who prefer the look of unpainted windows or want to avoid the additional step of painting.
Secondly, latex-based compounds offer a longer life expectancy compared to oil-based putties. They also require less drying time before painting, with latex paint typically applied after three days and oil-based paint after seven days. This makes latex-based compounds more convenient and faster to work with.
However, one challenge with latex-based compounds is that they tend to begin drying before they can be tooled smooth. Additionally, they may be more susceptible to mildew if left unpainted, as older glazing compounds often contained boiled linseed oil, which could serve as a food source for mildew. To address this, modern latex-based compounds can be painted with exterior acrylic latex, resulting in a glossy and mould-free finish.
When deciding between oil-based and latex-based compounds, consider factors such as window age, frame material, and ease of application. For wood windows, traditional glazing putty or latex-based compounds are often preferred, while metal sash windows may require specific glazing putties designed for metal frames. Ultimately, both options have their advantages, and the choice depends on the specific needs and preferences of the user.
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Oil-based glazing compounds should be at room temperature
Glazing putty is a versatile product that has been used for centuries to install glass into windows. It is used to seal the individual panes of glass in wood, steel, and, to a lesser extent, aluminium windows. While it fell out of favour in the 1950s and 1960s, it is still commonly used today, especially for restoring historic windows.
If you're planning to glaze your windows, it's important to note that glazing compounds come in two varieties: oil-based and latex/acrylic. Latex products are often preferred because they have a longer life expectancy, and you don't have to wait days before painting them as you do with oil-based putty. With latex, you can apply latex or oil-based paint after the compound has fully dried (typically within three days for latex paint and seven days for oil-based paint).
However, if you choose to use an oil-based glazing compound, it's crucial that the compound is at room temperature. This is because oil-based compounds need to be kneaded like bread dough to ensure a smooth application. Warm temperatures can make oil-based compounds messier to work with, as they become oilier. Additionally, oil-based compounds have a longer curing time, typically taking two to three weeks.
If you're glazing dual-pane windows, it's important to understand their unique characteristics. Also known as double-glazed windows, they provide up to twice the energy efficiency of single-paned windows due to the air cushion created between the two panes of glass, which provides better insulation and prevents drafts. When reglazing dual-pane windows, it's essential to ensure that the window is clamped down on a flat surface to achieve better results.
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Glazing points hold the glass in place
Glazing points are small, sharp, triangular or diamond-shaped metal pieces that are used to hold glass in place while the glazing compound hardens. They are especially useful when reglazing windows, as they prevent the glass from falling out in case the putty fails. Glazing points are also useful when dealing with thicker panes of glass.
When reglazing a window, it is important to first remove any broken glass shards and old putty. Heavy gloves and eye protection should be worn during this process. The new glazing compound can then be applied, and the glass set over it. Glazing points can be pushed into the corners of the frame to hold the glass in place while the compound hardens.
Some people choose to forgo glazing points and instead use putty to hold the glass in place. This can be done by adding putty to the four corners of the frame and then adding the glass, but if the putty fails, there is nothing to prevent the glass from falling out.
Glazing points can be purchased from hardware stores and are available in various sizes. They can be installed using a point driver or a tack hammer. It is important to ensure that the glazing points are not too long, as this can cause them to stick out and be visible from the inside of the window.
Overall, glazing points are an important tool for holding glass in place while the glazing compound hardens, and they provide a useful backup in case the putty fails.
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Frequently asked questions
Yes, you can glaze dual-pane windows. Glazing putty can be patched and doesn't require the full removal of the sash. Dual Glaze is a suitable product for this purpose, but it takes a long time to cure (2-3 weeks).
First, remove the broken glass (if any) and clean the old glazing putty from the window. Then, apply a primer to any bare wood inside the window frame. Next, apply the glazing compound to the backstop of the sash, and install new glazing points. Finally, finish the glaze with a clean line, holding your knife at an angle between the glass and wood.
Some alternatives to traditional window glazing include double or triple-pane windows, low-emissivity coatings, and gas-filled windows. In terms of application, alternatives include silicone caulk, glazing tape, and acrylic glazing compound.
