Vinyl Window R Value

A lower u factor means a better insulating window.

Vinyl window r value.

As a window s emissivity decreases its r value increases. R value measures how well certain building insulation materials can resist heat. U value is the amount of heat transferred through a material. To compare r value and u factor.

R values of uninsulated concrete. The r value is the measure of heat flow resistance the higher the r value the better. The higher the r value the greater the resistance. When determining how much insulation you need don t guesstimate calculate.

And we test them to the extremes so you can count on them to last. Our windows and doors are engineered for energy efficiency. Better windows have high r values and low u factors see table 1. Alside vinyl windows have several replacement and new construction lines including double hung casement and bay windows.

Know exactly how much you need with our project calculators. Standard clear glass has an emissivity of about 0 84. Alside windows are custom made to fit existing window openings. The higher the r value the greater the insulation performance.

We ve designed the entire window including the frame and sash to perform at its best. While the u factor is used to express the insulation value of windows r value is used for insulation in most other parts of the building envelope walls floors roofs. The rate at which the glass transfers loses heat. When shopping for windows or doors look for higher r values and lower u values for the most energy efficient products possible.

Ultimately when talking about windows the u and r values are both a representation of the same thing. A double pane window with a low e coating will have an r value equivalent to or better than a triple pane window. Fortunately window technology has greatly improved so it is now possible to have large expanses of windows. Since the different parts of a window all have different u factors.

The r value as it is known to most consumers is really an inverse representation of the u value. The lower a unit s u value number the slower it transfers heat. Energy and the environment. A window is considered to be low e if its emissivity is 0 35 to 0 05.

Concrete homes magazine web search 5 18 2010 r value for concrete glass other materials wikipedia web search 5 18 2010 citing ristinen robert a and jack j. The lower the u value the slower the rate of heat flow and the better the insulating quality. If you like math a u value 1 r value the u value is the inverse of the r value. John wiley sons inc 2006.

While they are related different assumptions and test criteria are used in calculating the two values so they cannot be directly converted.