What U-Value should windows have?

When it comes to windows, the regulations cover a number of areas, with energy efficiency being one of them. 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?

1.6Wm2K
What is the minimum U-Value and Window Energy Rating for Windows? All new or replacement aluminium, PVCu or timber windows require a minimum C Window Energy Rating or a U-Value of 1.6Wm2K or less.

What is a good U-Value for double glazing?

Below are the general U values for varying glazing standards: Single glazing U value = 5.6 w/m2K (Watts / square metre Kelvin). Double glazing (with air cavity) U value = 2.8 w/m2K. Double glazing (with argon gas cavity) U value = 2.6 w/m2K.

What is the U-Value of glass?

The U-value of a window is a measurement of the rate of heat loss indicating how well your windows are keeping valuable heat in. It is expressed as Watts per square metre Kelvin W/m2 K. The lower the U-value the better the thermal performance of the glass.

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 …)

Is Thicker double glazing better?

Two panes of glass work better than a single frame because it reduces heat loss, which will in turn lower your heating bill. It will also lower your cooling bill because the temperature in the house stays at a more constant number. The thicker the glass you choose, the better the insulation will be.

How do you calculate the U-value?

What is the U-value of Low E glass?

about 0.36
This type of glass is called low-emissivity, or low-e, glass. A double-pane window with a low-e coating has a U-value of about 0.36, which translates to 35 percent less heat gain or loss than conventional double-pane windows. Triple-pane, low-e window units are also available and have a U-value of approximately 0.25.

How do you calculate the U value?

Is the lower the U value the better?

U-values can tell you how well an insulated glass unit (IGU) will hold in heated or cooled air. The lower the number, the better the insulating performance. U-values generally range from 0.1 (very little heat loss) to 1.0 (high heat loss).