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Windows and Doors-R-Us Blog.   

             The replacement window   industries "NewTechnologies in Window Ratingsand Preformance"

       Design Preformance is not to be confused the DP rating on a window or door glass. The DP rating on the window stands for Design Pressure and is a vary simple rating as far as it's 1-3 scale of measurement, but the test preformed and the method of  measurement is very confusing. Generaly the higher a DP rating the better wind resistance it has and at the same time it can have a terrible Water Filtration and receive the same rating.

            The industry is doing something about this problem. There will be a new addional rating for water and air filtration and Dp will  be for wind tolerance. I personally fell they should also magnify there scale for a better comparisons sake  but  of coarse they have not asked me to date!

             Design Preformance is an installation term for how well built a window or door is.  Material, Thickness of Frame and Sash,  Design and  Seal  Count, Balance and Tracking and the Rack of the product before entering it's hole.

             Experienced  installation and repair  is the best Design Preformance a Product can receive and  Windows and Doors-R-Us have installed all types, including Pella, M&W, Seabrook, Jeldwin though we don't adveritse for them, we will and have done so. We are the Triangles Andersen  Certified service repair and installers. We know windows and doors and are often called by dealers to save projects.

          Let us give you the rating  that means the most for best long lasting energy saving product you can put into your home. Call us or contact us Today.







Reduces summer heat

Low-E glass filters long-wave radiation from the sun. Solar heat gain from the summer sun is reduced keeping your home cooler. 


Blocks winter heat loss

In the winter months, Low-E  glass lets warm solar rays into your home while blocking the heat inside your home from escaping. 



   Frequently Asked Questions




1. Will replacing windows or doors make a mess of my house?

Remodeling generally creates dust and air borne debris which can filter through out your home, with our booth containment installation process we can limit the area of the window or door being replaced. This is not just a commitment to a clean and dustless install but to also maintain good air quality during the transition period of window or door installations.


2. What is the most important factor in replacement windows or doors?

There are over 3000 window and door manufacturers in the United States alone, so there are many options and products to choose from, but the #1 thing these products need to meet ratings and projected performance is installaion.  We square up frames of windows and doors during installation for the proper seal with designed weather stripping and shim the frames before the final trim out to ensure they stay in place, giving to replacement the correct operation but also keeping warranty and the lasting performance designed by the manufacturer.


3. Is replacing my windows or doors enough?

Even the best and most energy efficient windows on the market can lose up to 40% of it's insulating ability or U-factor by improper installation and insulation. Air conducts hot and cold temperatures and pockets of air are formed around a replacement window or door during installation. We use a combination of foam and cellulose insulators that not only have the highest R-value per sq. in. but fill the void of pockets formed around your new replacement window or door.


4. What makes one replacement window better than another?

There are many factors in making an energy efficient window and most research will bring you up to speed on Solar heat gain and U-factor but most neglect the over all design performance of a product. With the moving parts and over all settling of a home and just general abuse from outside elements such as wind, rain and changing temperatures have an effect on the longevity of how a window will perform in the years to come. We make it our business to thoughly check frame thickness and design, along with sash balance and weather stripping used in a product to offer not only energy efficiency but a product that produces savings years down the road.


5. What is NFRC?

Ultimately, The National Fenestration Rating Council (NFRC) was formed in responce of the energy crises of the 1970's.

To address concerns about energy consumption, the fenestration industry developed a host of new energy efficient technologies; low-e coatings, low conductance spacers,gas fills,ect. U fortunatly, in advertising with these new technologies  some manufacturers made outladish claims about the performance of their products. Consumers complained, and the government began to investigating allegations on unscupulous practices in the industry.

By the late 1980's, key industry stakeholders began to realize that something had to be done to prevent widespread confusion, federal intervention, and perhaps costly litgation. They came together in Vancouver British Colubia in 1989 and founded NFRC to provide independent verifacation of product preformance.


6. What is Fenestration?

Any opening in a building envoloped including windows, doors, and skylights. Manufacturers are constantly improving and re-designing their products to meet the needs of their consumers. How do these consumers know the benifits they can get from the new technology? By looking for the NFRC label or label certificate and understanding what NFRC ratings mean.


 7. Solar Heat Gain or SHGC?

The National Fenestration Rating Council (NFRC) has established a standard method for rating the amount of solar heat gain that is omitted through a window. This standard is NFRC 200 "Procedure for determining fenestration product solar heat gain at normal incidents". This standard provides a uniform methodology for indacating the ability of a window, skylight or other glazed products to omit solar heat gain. Therefore, the lower the SHGC rating, the better the ability of the product to block the heat from the sun.

A simple way to explain SHGC is in terms of ratio%; Where 1 is the maximum amount of solar heat gain that came come through a window and 0 is the least amout. An SHGC of .30 then means that 30% of the available solar heat is coming through the window.

8. What is U-Factor?

Windows are very different from insulation in walls and ceilings. Windows let light in and allow people to see out, and they interact with their enviroment in ways that insulation does not. They re-act to outside air temperatures, sunlight, and wind, as well as indoor air temperature and occupant use. Windows are strongly affected by solar radition and the air flow around them. R-value does not accurately reflect this interaction. Therefore, the window industry measures the energy efficiency of their products in terms of thermal transmission, or U-factor. U-factor messures the rate of heat transfer through the product.

Therfore, the lower the U-factor, the lower the amount of heat loss, and the better a product is insulating a building.


9. What is Condensation  Resistance  or (CR)?

Condensation Resistance (CR) measures the ability of a product to resist the formation of condensation on the interior surface of that product. The higher the CR rating, the better that product is at resisting condensation formation. While this rating cannot predict condensation, it can provide a credible method of comparing the potential of various products for condensation formation. CR is expressed as a number between 0 and 100.  Therefore the higher the rating the more resistant the window has to condensation

* This rating is optional and manufacturers can choose not to include it.


10. What is Visible Transmittance or (VT)?

Visible Transmittance (VT) measures how much light comes through a product. The visible transmittance is an optical property that indicates the amount of visible light transmitted. VT is expressed as a number between 0 and 1. The higher the VT, the more light is transmitted. The light transmitted through the window can create a thermal warming of objects in a building

* This rating is optional and manufacturers can choose not to include it


11. What is Air Leakage or (AL)?

Air Leakage (AL) is indicated by an air leakage rating expressed as the equivalent cubic feet of air passing through a square foot of window area (cfm/sq ft). Heat loss and gain occur by infiltration through cracks in the window assembly. The lower the AL, the less air will pass through cracks in the window assembly.

* This rating is optional and manufacturers can choose not to include it.


12. Why Full Frame Replacement?

There are two sounds reasons for full frame replacement. First, having a full composite frame and exterior trim package assures that the exsisting frame and trim will no longer have a chance for moisture problems, usually causing costly repairs. The second reason for full frame replacement is that the window is out of its envoloped hole to re-insulate around the frame, keeping the R value of the walls surrounding the new frame consistent. Air leaks around a window frame can be up to 40% of energy loss through an exsisting window frame. Therefore, you are getting the most of your investment from your newly installed windows.


13. Whats the difference between a Full Frame Replacement Window and a just a Replacement Window?

A Full Frame Replacement is removing the entire window with both interior and exterior trim. And installing a new composite frame and exterior trim. Interior trim can be saved, but in most cases replaced with a matching trim to fit the style of exsisting trim of the home.

A Replacement Window is an incased track and sash removal. It's when you remove the exsisting track  amd sash but still use the exsisting frame and trim that you already have.


14. What is booth containment installation?
A temporary plastic encloser surrounding an opening of a door or window before remodeling or replacement begins reducing dust and debris from spreading throughout the home and containing outside elements while a window or door is in transition.

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