Energy Saving

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Energy Saving Glazing Design

Follow our recommendations to save oun your energy bills by being smart with glazing decisions.

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One of the biggest energy saving elements you can draw from is the power of the sun and the heat and light that is available if your home is designed correctly..

Glazing Design

Energy Saving - Glazing Design

Despite its benefits, glazing does have its drawbacks. While admitting lots of natural daylighting and solar radiation during the cold winter months,

You will have to control the heat gain during the summer months and minimize the heat loss during the winter months. This can be handled in a number of ways:

Energy Saving - Roof and Eyebrow Overhang Design:

Have your overhangs designed in such a way that they shade the glass during the summer months and admit the sun during the winter months.

Light Shelves

Energy Saving - Light Shelves

Save Ten With Angie's List!

This is a function of playing with the summer vs. winter solar angles and the distance the overhang projects from the exterior wall of the house and the location of the overhang vertically as it relates to the top of the glazing.

If the roof overhang is located too far above the glazing to provide adequate, or any shading at all, you can design small window specific overhangs, typically called eyebrows or light shelves.

Light Shelves serve double duty for both shading the glazing below the light shelf and bouncing the light from the top of the light shelf through glazing located above the light shelf.

Architectural Rendering

Energy Saving - Buy The Best Glazing You Can Afford


Energy Saving - Purchase The Best Glazing You Can Afford::

This will have incredible energy payback and will give you added comfort as well.

Most of the premanufactured window manufacturers such as Andersen, Pella, Marvin, and others will give you several high performance glazing options as an upcharge. Some of the options you have with high-performance glazing are:

Low E Glazing Diagram

Energy Saving - Low Emissivity Coating


Energy Saving - Low E Coating:

Low E coating. This is a thin metal coating that is placed on one of the surfaces of thermal pane glass (most often sealed within the air space of the glass). It reflects solar heat in the summer and lets the solar radiation pass into the living space in the winter.

Argon or other gas between sealed thermal pane glass. With some of the newer gas thermal units, you get a very good boost in R values of the glass.

Multi-layered glass panes utilizing 2 or 3 glass panes. This will be a cost consideration as 3 pane units are quite a bit more expensive than dual pane units.

Check the overall performance ratings of different window types and manufacturers. This is the rating of the window installed in the wall and considers not only the glass but the air gaps and the sealing capabilities of the windows.

Architectural Rendering

Energy Savings - Use Blinds to Save Energy


Energy Saving Glazing Add-ons:

There are some option that you should consider when shopping for your glazing, and other features that you should consider to give you even more energy savings.

Carefully analyze the R rating of the window units. This number directly compares performance ratings from different manufacturers. Consider both the glazing R value and the total assembly or the total window R value.

For comparisons sake, a well insulation 3-1/2 stud wall with batt or foam insulation the full thickness of the wall and sheet styrofoam on the outside as a sheathing materials can have an R value as high as 22. Window typically are in the 2 to 3 range.

Consider window shades for light control and for increasing the R value of the window assembly. With some shades you can increase the window R values by 20 to 25%. Other even higher performance shades designed with air space between the fabric can approach the 50% range.

Energy Saving Glazing Design - What is the difference between R-value and U-value?

R-value and U-value are essentially two sides of the same coin. R-value is usually cited when discussing things such as wall and ceiling insulation values. The term does not translate well to windows and other fenestration products.

That industry prefers U-values. The two are actually inversely related. The higher the R-value, the better insulated are the walls and ceilings.

The lower the U-value, the better job a window does in keeping out the heat and cold. [Solar Heat Gain Co-efficient]

Energy Saving Glazing Design - What does Solar Heat Gain Co-efficient (SHGC) mean?

SHGC measures how well a product blocks heat caused by sunlight. The SHGC is the fraction of incident solar radiation admitted through a window, both directly transmitted, and absorbed and subsequently released inward.

SHGC is expressed as a number between 0 and 1. The lower a window’s SHGC, the less solar heat it transmits. In very cold climates, windows with very low U-values minimise discomfort.

If summer discomfort is expected very low SHGC values should be looked at, but bear in mind that lower SHGCs lead to increased comfort in the summer at the expense of less winter solar warmth.

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