Step 3: Window Technology
Window technology has made significant advancements over the past decade, and there are now a whole host of choices for your home. As part of your window buying process, it’s important to know what makes a good window. In this section of the buying guide, we’ll look at:
Window Frames:
The frame is the first place to check for quality. In the past, most windows were made from aluminum or wood, but today most modern windows are built from strong, insulating PVC polymer. Buying a window with a weak frame can lead to trouble. A weak frame can lose its shape over time causing the sash to operate poorly. The result? Air or moisture will leak into your home.
How can you identify a strong window frame?
- Look at a cutaway piece of the frame and sash – a reputable window company will be happy to show you.
- Count the number of chambers or channels in the frame and sash – the more channels, the greater the strength of the window.
- Look at the thickness of the PVC walls – the thicker the walls, the greater the strength of the window.
- Ask if any of the channels are steel reinforced, especially on larger windows. Steel reinforcement adds a great deal of strength and will prevent sagging.
If your new windows have numerous chambers, thicker PVC walls and steel reinforcement, they will maintain their structural integrity for a long time. This will help your windows operate optimally, and you’ll enjoy energy efficiency for many years.
Window Weatherseals:
Next, count the weatherseals located between the sash and the frame.
- Lower quality windows will have just one weatherseal
- Higher quality windows will have two or three weatherseals.
More weatherseals, and better quality of weatherseals, will keep the air and moisture out of your home, keeping the interior comfortable and energy efficient. Extra weatherseals are often referred to as “secondary” weatherseals and function to support the “primary” weatherseal.
Also check the quality and thickness of the weatherseals. The thicker the weatherseal, and the greater contact between the weatherseal and the PVC, the better the weatherseal will perform over time.
Window Hardware:
Hardware is a very important part of the construction of your window. Hardware includes the hinges, operators, locks, keepers – all the pieces that make your window operate properly. Look for hardware made by well-known manufacturers with solid reputations for quality. Beware of “knock-off” hardware that may be made of inferior materials or to inconsistent standards.
- Casement or Awning Window Hardware: Casement and awning windows are a stylish option for a modern home. Look for multi-point locking systems, where a single switch engages several locking points between the sash and the frame. This provides better security and improved thermal performance, since the sash is held tight to the frame in multiple locations.
- Sliding Window Hardware: For tried and true sliding windows, look at the track system that the sash slides on:
- Traditional wheel and track systems operate well when your window is new, but can be hard to clean and can lose their performance over time, as the wheels or tracks wear out.
- Sliding window systems that use glides, where the sash rides in a flat track on glides attached to the bottom of the sash, tend to retain their easy motion for a longer period of time, and the sash track is much easier to clean.
Glass Technology:
Window glass has advanced significantly over the last several years, with glass companies spending millions of dollars inventing new glass coatings to achieve better thermal performance. The coatings are applied to one or more of the surfaces of the glass pieces within the sealed unit. Some of the more popular sealed glass unit options are:
- Low E, LowE2, LowE3: Variations of Low Emissivity coatings. Applied to the glass surface to improve thermal performance, block ultraviolet light, and reduce heat gain from the sun. This greatly improves the comfort of your home.
- Laminated Glass: Glass with a plastic interlay or film which is laminated between two pieces of glass, providing amazing glass strength. Laminate glass is often used for increased security or where glass breakage is a concern.
- Tempered Glass: Heat-treated glass that provides extra strength, and is safer for your home. If the glass does break, it shatters into small pieces rather than sharp-edged shards. Most building codes require tempered glass in doors, windows adjacent to doors, windows close to the floor, and certain windows in bathrooms.
- Argon Gas:An inert gas that is pumped into the airspace between the two pieces of glass in the sealed glass unit, providing much improved thermal performance and more comfort in your home. With argon gas, it is important to have a good quality spacer system between the pieces of glass, so that the argon gas does not leak out over time.
- Krypton Gas: An improvement on Argon gas, with a thermal performance second to none. Quite expensive due to its short supply.
- Easy-clean Technologies: Various technologies have been developed to make the outside surface of the glass sealed unit easier to clean. Most result in a chemical reaction between the coating and the sun’s ultraviolet rays that cause dirt to loosen – then when water hits the window, the dirt is washed away. These coatings also often result in water “sheeting” rather than creating water drops that leave dust or dirt when they evaporate.