Vinyl Window R Value

Alside windows are custom made to fit existing window openings.

Vinyl window r value.

The more common term r value refers to the resistance of the window to heat conduction and it is the inverse of the u factor that is r value 1 u factor. Since the different parts of a window all have different u factors. 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.

When shopping for windows or doors look for higher r values and lower u values for the most energy efficient products possible. While they are related different assumptions and test criteria are used in calculating the two values so they cannot be directly converted. How can a replacement window s u value be improved. The lower a unit s u value number the slower it transfers heat.

Optional foam insulation can further increase energy performance. A window is considered to be low e if its emissivity is 0 35 to 0 05. To compare r value and u factor. Alside vinyl windows have several replacement and new construction lines including double hung casement and bay windows.

Energy and the environment. The higher the r value the greater the resistance. When determining how much insulation you need don t guesstimate calculate. Ultimately when talking about windows the u and r values are both a representation of the same thing.

A lower u factor means a better insulating window. As a window s emissivity decreases its r value increases. Know exactly how much you need with our project calculators. John wiley sons inc 2006.

We ve designed the entire window including the frame and sash to perform at its best. The rate at which the glass transfers loses heat. And we test them to the extremes so you can count on them to last. 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 insulation performance. U value is the amount of heat transferred through a material. Better windows have high r values and low u factors see table 1.

Standard clear glass has an emissivity of about 0 84. R value measures how well certain building insulation materials can resist heat. Fortunately window technology has greatly improved so it is now possible to have large expanses of windows. Our windows and doors are engineered for energy efficiency.

A double pane window with a low e coating will have an r value equivalent to or better than a triple pane window.