Double glazed windows explained

Double glazed windows and double glazed doors will have a much lower Uvalue than standard single panes. What are the benefits of measuring double glazing with the U-value? Measuring single or double glazed windows will highlight where in your home heat loss is increasing your energy bills.

Of course, double glazing is also installed to reduce noise pollution and improve security, but the U value only incorporates heat loss in its calculations. The nationally recognised rating method for double glazed panels is for the whole window, including the glass, frame and spacers.

However, sometimes a centre-of-glass U Value is given, which simply measures the performance of the glazing alone. It is common for double glazing companies to cite the stand alone heat reduction in just the pane, so always double check how much heat will be lost for the rest of the window frame as well. However, the key to reducing noise as much as possible is to disrupt the sound waves and frequencies as they pass through a material.

This can be done by combining different thicknesses of glass close together. Everest Acoustic glass in double or triple glazing uses panes of 6mm and 6. An additional special laminate coating absorbs more energy of the waves and reduces the frequency as they pass through. Because of these special properties, acoustic glass can reduce noise by up to 40db in triple glazing.

Everest is the only home improvement company to be awarded the Quiet Mark accreditation because of our dedication to noise reduction. The air around us is full of tiny molecular droplets of water that are invisible to the eye. In warm air, the molecules are spaced far apart which holds the moisture but as the air cools the molecules come together.

When the molecules are so close together they merge into visible liquid this is known as the 'dew point'. Condensation manifests when moisture-laden air comes in contact with a cold surface — such as a windowpane. When you boil a kettle, cook food or have a hot shower, the air becomes filled with more moisture than usual and this is why kitchen windows and bathroom mirrors are most steamy.

We also expire moisture on our breath and this is why you find condensation on a bedroom window when we wake up. Inside the double glazed sealed unit, the contained air also holds a low level of moisture that could form on the glass if the temperature difference should change. To address this, every sealed unit is built with crystalline desiccant like what you find in a new bag or shoes contained in the spacer bar.

The desiccant draws the moisture out of the air gap and keeps the internal space between the panes dry. Internal condensation happens when the seals on the sealed unit begin to fail and more moisture is drawn into the unit. The desiccant becomes saturated and can no longer hold moisture and as a result, condensation forms inside the unit.

The reason we see so much condensation on single glazed glass is that the glass is susceptible to cold and stimulates the dew point from the water vapour in the air. Double glazing helps to reduce condensation on the inside of your windows inside the room because the glass is not as cold as single glazed. The air gap inside the double glazing sandwich helps to keep the internal pane of glass closer to room temperature.

This difference in temperature is enough to stop the water vapour reaching dew point and forming condensation on the glass. We're so sure about the quality of our double glazing that we offer a lifetime guarantee against condensation and fog inside our sealed units.

Double glazing reduces heat loss and acts as a barrier against the cold but it doesn't stop the warmth from the sun, known as solar gain. Sunlight produces short wave infrared radiation — this is what warms objects in the sunshine. The short waves are absorbed by glass from the outside and the energy becomes re-radiated from the inside of the glass as long-wave infrared.

Short waves can pass through glass but the long waves can't, so the thermal energy of the infrared radiation becomes trapped bumping against the glass unable to pass through. This process is known as the greenhouse effect. The rise in temperature is known as solar gain — we measure this by G value. For windows facing direct sunlight, we recommend low-emissivity glass Low-E that help to regulate room temperature because rooms quickly overheat with solar gain.

If you've ever sat in a conservatory on a sunny day you will know how oppressive it can get. Low-e glass applies a microscopic magnetron coating that reflects the shortwave radiation away from the outside of the glass. The window maintains the clarity of daylight but stops the build-up of thermal energy and the greenhouse effect.

Low-e glass can also be combined with a solar control glass coating that further filters the light to reduce the solar glare and reduce damage to furnishings and fabrics. Hit enter to search or ESC to close. Close Search. No Comments. Advantages of Double Glazed Windows Double-glazed windows are energy efficient, are a great insulator and prevent heat loss. This is a lot better than single-paned windows. These windows stop drafts through the window and the frame.

They keep noise to a minimum and prevent unwanted heat from coming into the home in the summer. Better security on a home with double glazed windows.

The gases make the windows more efficient. However, they are more expensive when the gap between the panes is filled with a gas of krypton, argon, or xenon instead of air. Argon — is the one that is most common and affordable. It also helps improve thermal insulation efficiency and often combined with low E energy efficient windows. It is more commonly found in commercial, not residential buildings.

Here is a great video about 10 questions to ask when considering double-glazed windows. Tags: home inspector home maintenance hurricanes Realtor windows. Leave a Reply Cancel Reply My comment is..