To get email notification when someone adds to a thread you're following, click on the star in the thread's header and it will turn yellow; click again to turn it off. To edit your profile, click on the gear.
The Wall has a powerful search engine that will go all the way back to 2002. Use "quotation marks" around multiple-word searches. RIGHT-CLICK on the results and choose Open Link In New Window so you'll be able to get back to your results. Happy searching!
In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
Need to contact us? Visit https://heatinghelp.com/contact-us/.

Heat loss Calc, correct wi ndow measurments

Robert_HRobert_H Member Posts: 135
The many heat loss calculation instructions I have found tell you to measure the windows or enter the window dimensions, but what should I measure? glass edge to glass edge, sash to sash, use the actual frame size of the window etc? What about when looking at a window catalog which provides a rough in size?

this seemingly critical piece of information is missing from everything I have read so far.

thanks

Robert
·

Comments

  • STEVEusaPASTEVEusaPA Member Posts: 1,001
    Just...

    The easiest way I can think of to explain, just measure it like you were fitting it for mini blinds, to cover the glass.  It's more important to get the right type of window (r value).  A few sq inches wont matter
    steve
    ·
  • Robert_HRobert_H Member Posts: 135
    Thanks

    Thanks Steve
    ·
  • SpenceSpence Member Posts: 316
    Window Measuring

    When you are working with load calculations with respect to windows, you are working with "fenestration." It is a term used to describe all types of glass (windows, doors, skylights, etc.). The term applies to the entire assembly of glazing, sash, and framework that fits into a rough opening.
    ·
  • Robert_HRobert_H Member Posts: 135
    Thanks Spence

    So the overall dimensions or minimum rough opening if I'm looking at a catalog.
    ·
  • SpenceSpence Member Posts: 316
    Fenestration

    Correct! Then, once you have your type and size, take into account blinds, shading, awnings, orientation, and whether or not the glazing is flat against the wall (as opposed to a bay, bow, skylight, or garden window) and you're in pretty good shape. If you're wondering about the different grades of windows, glazing insulation value is shown in a "u" factor. "R" and "u" are a reciprocal; 1/R = u, and 1/u = R. For example: if your window has a u-factor of .36, then insulating value is equal to R-2.8.
    ·
This discussion has been closed.

Welcome

It looks like you're new here. If you want to get involved, click one of these buttons!