Circle top windows are dimensionally an equal half of a window.  An eyebrow is typically wider than it is tall. Accentuate your openings by adding another energy efficient area for light to enter. Add your own personal touch with grid designs, classic beveling or etching.

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Insulating Glass Top
Bristol's character is centered on a super insulating glass system that has one primary goal; To save you money, energy and time! The only way to guarantee you energy savings for a lifetime is to build an insulating system that accentuates a uniquely designed frame.

Recognizing that glass itself cannot provide the energy efficiency needed to meet the above standards Bristol's Super Triple-E glass includes all of the following:
  • 3 pieces of Top Quality American-Made  Precision Float Glass
  • Two air spaces with an overall 1" insulating space.
  • 2 Soft Coat Low-E Layers -- atomically thin metallic particles that provide the optimum in heat reflective performance while retarding ultraviolet rays.
  • BR50 Thermoplastic Spacer System -- Continuous nonmetallic spacer creates an unbreakable bond
  • ALPHA-10 Insulating Gas -- A special mixture of safe, nontoxic, nonflammable inert gases fills both air spaces to create the ultimate in barriers against unwanted energy loss, condensation and noise. Availability ranges from double glass clear to the most popular and most energy efficient Super Triple E with dual Low-E glass side and dual Alpha-10 gas filled chambers.
Window Colors Top
Warm vinyl colors provide a comfortable blend to any decor. Never needs painting. Won't chip or peel. Vinyl colors are through and through.
  • Exterior Colors: White, Beige or Brown
  • Interior Colors: White, Beige, Brown or Woodgrain
  • Combinations Exterior/Interior: White/Woodgrain, Beige/Woodgrain, Brown/Woodgrain
  • Exterior Solar Reflective Finish (SRF) adds 16 warm exterior colors to pick from

Note:  Woodgrain options not available on hoppers, 600 series, circletops, eyebrows and other specialty shapes.

Internal Grids Top
Choose from over 50 standard rectangular, diamond or hub grid patterns. Grids are available in white, beige, brown woodgrain and gold colors. Hub grids can have etched corners that give the look of a real circle top configuration.

Internal grids compliment your homes design and you never have the hassle and inconvenience of cleaning in between grid panes.

Decorative Glass Top
Choose from many decorative glass patterns and styles that include everything from etched or beveled to stained and leaded patterns. Patterns are on exposed inside surface of glass.

Add your very own personal touch by submitting your own artwork to be transformed onto your glass. Obscure glass is available for locations where you want to let filtered light in while blocking the view from outsiders.

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Window Warranty Top
A 50-year transferable warranty means homeowner protection for the original owner and for  new owners in the event of selling your home. This feature adds value to your investment and your home. 

Recent studies prove that a major home remodeling project can recoup as much as 92% in value upon selling.

Bristol windows carry a 50-year transferable warranty for your protection.  If, for any reason, our insulating glass should fail it is warranted and will be replaced. Our three-year glass breakage pledge protects you from accidents beyond your control.  Dealerships warrant their craftsmanship in installation.
Installation Methods Top



A new study has been completed at NCTL Testing in York, PA with AWDI. The tests pitted ASTM 2112 Installation, "Caulk and Walk"â„¢ installation and AWDI's R5 installation protocol. The tests and computations confirm and document the dramatic difference between installed performance of windows as compared to the promised performance determined in laboratory tests where the window alone is tested. These product tests become promises in literature, but unfulfilled too often in the home. The tests conducted at NCTL and in Germany in 2011; conform to ASTM recognized air and water tests and for installed windows and included the gap between the window frame and the opening frame. Final thermal results conform to best preactices as defined by NFRC.

Research work tied to the British Fenestration Rating Council A through G Window Standards, has also confirmed that sealant only installations reduced an "A" window to a "D" window performance. Sealant and insulation in the cavity fare better, but still reduce the overall energy efficiency to well below the performance attained in laboratory testing.

The testing at NCTL of AWDI's contention of reduction of in-service performance from promised performance, established inarguable results that show that standard installation reduces an R-5 window to an installed rating of barely over R-2.

Bottom Line: Government encouraged .30/.30 windows when installed in new construction lose more than 15% of the thermal performance promised, and in replacement, that efficiency loss is closer to 25%. People who buy .30/.30 windows hoping for the energy efficiency they promise - don't get anywhere near it.

The culprits? Failure to re-establish the wall/window weather barriers (there are 5), poor R-Values of sealants and trim, inconsistent application of cavity insulation, air leaks due to thermal bridges like shims and capping, and sealant failures, i.e., poor installation!

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Bristol Vinyl Reinforced Triple Pane Energy Efficient Replacement windows available to dealers and/or homeowners in the following states:
Alabama, Alaska, Arizona, Arkansas, California, Colorado, Connecticut, Delaware, Florida, Georgia, Hawaii, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts , Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Nevada, New Hampshire, New Jersey, New Mexico, New York, North Carolina, North Dakota, Ohio, Oklahoma,, Oregon, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Utah, Vermont, Virginia, Washington, Washington DC, West Virginia, Wisconsin, Wyoming