# Question: What Is The U Value Of Low-E Glass?

## What is a good U value?

The best insulating materials have a U-value of close to zero – the lower the better.

Building regulations currently stipulate that for a new building, the elements must have maximum U-values as follows: Wall – 0.3 W/m2k.

Roof – 0.15 W/m2k..

## How do you find the U value?

U-value formula U Value is the reciprocal of all resistances of the materials found in the building element. To calculate the U-Value of the building element the R-Value of all the different components that make up that element will be considered. U-Value (of building element) = 1 / (Rso + Rsi + R1 + R2 …)

## Does Low E glass scratch easily?

Why is that? The coating is actually very difficult to scratch and is harder than the glass. For example, if you scratch the coating with a coin, it is the metal from the coin you see deposited on the glass surface itself rather than a scratch.

## What is a good U value for glass?

In 2018, Part L building regulations for standard replacement doors and windows specified that a product should have a U-Value no higher than 1.6 for windows, and 1.8 for doors.

## What is the minimum U value for a window?

1.6 W/m2KTo comply with building regulations, windows (like every other element of your property) must meet a certain minimum U-value. In the case of a window, it’s 1.6 W/m2K. Double-glazed windows, filled with argon, are typically 1.4 W/m2K, while thicker triple-glazed windows can go as low as 0.7 W/m2K.

## How much does Low E glass cost?

A low-e window glass price will generally be around \$14 per square foot. Additionally, in the long run, low-e coatings will help you save money on energy bills.

## How long do low E windows last?

10 to 15 yearsLow-emittance or low-e window film is very durable and will last for years. Its average life expectancy is 10 to 15 years, which will vary depending on climate and whether you use it mainly on the outside of your windows, where it is exposed to the elements.

## Does Low E glass look different?

You may ask, “Does Low E glass look different than other glass in windows and doors?” The answer is, “just a little.” Overall, the appearance of the windows and doors that have Low E glass are the same but the metallic coating in the low E glass creates a bit of a tint compared to glass that is not Low E.

## Does Low E glass keep heat in?

Low-E has the ability to keep the temperature of the surface of the glass facing the interior very near that of the room itself, regardless of outside temperatures. Low-E squared glass can keep the inside glass temperature within 1°F of a room with no windows.

## Is Low E 366 worth it?

The ultimate performance glass, Low-E 366 provides the highest levels of year-round comfort and greatest energy savings. Its patented coating offers an ideal balance of solar control and high visibility. Blocking up to 95% of the sun’s damaging rays, Low-E 366 glass sets a new standard in energy performance.

## Is Low E glass worth the money?

Absolutely! Low-e glass options are definitely worth the investment. For just a few more dollars than standard glass, you get the energy savings, improved year-round comfort, and protection from low-e glass. And that little extra cost can pay for itself with the money you’ll save on utility bills!

## What does G mean for glass?

The g value of the glass simply tells us how well the glass transmits heat from the sun. It is expressed either as a percentage, or simple decimal. A g value of 1.0 (100%) would tell us that all solar heat could enter the building (so without any glass), and of 0 (0%) would be for an opaque material.