Seeing America Through Its Windows

Window History

“O beautiful for spacious skies, for amber waves of grain,

for purple mountain majesties above the fruited plain.”

— Katherine Lee Bates, 1893

A great window is designed to disappear. It holds back the cold, the heat, the wind, and the rain—letting through nothing but light and a clear view of the world. This is the story of how that window came to be: two thousand years of chemistry, craft, and American engineering, culminating in the high-performance replacement windows installed by TruBlu today.

When Sand Met Fire — The Birth of Glass

For most of human history, a window was simply a hole in a wall, covered by wooden shutters, oiled cloth, or animal hide when the weather turned. The chemistry that changed everything was discovered in Mesopotamia around 3500 BC: silica sand, soda ash, and lime. Under intense heat, these three raw ingredients fuse into glass.

Around 50 BC, Syrian craftsmen invented the blowpipe, which allowed them to shape thin-walled glass vessels. The technique spread to Rome, where artisans found a way to press the molten material flat. By 100 AD, Roman bathhouses and wealthy villas featured the world’s first window panes. Though thick, wavy, and full of distorting bubbles, they let light indoors while keeping the elements out.

The Grid Was Never Decorative

The divided-light grilles and grids seen in traditional windows were never a design choice; they were a manufacturing limitation. For centuries, glassmakers could not produce a pane of glass large enough to fill a standard window opening. The grid holding the small panes together was entirely structural.

In 1000 AD, German craftsmen developed the cylinder method: blowing a long tube of glass, cutting it lengthwise while hot, and flattening it. In the late 1600s, crown glass arrived. Glassblowers spun molten glass at high speed on an iron rod, utilizing centrifugal force to create a flat disc of unparalleled clarity. The outer ring was cut into small rectangular panes.

The iconic 6-over-6 sash of colonial America was born from this maximum viable glass size. The windows where the founding fathers debated were divided because manufacturing technology offered no other choice.

Modern Replacement Grid Options

•       True Divided Light (TDL): Individual structural muntins separating separate glass lites. Used primarily in historic restorations.

•       Simulated Divided Light (SDL): Grille bars adhered to the interior and exterior glass surfaces with a matching spacer bar between the double panes, preserving the window’s modern thermal seal.

•       Grilles Between Glass (GBG): A flat grille suspended inside the sealed double-pane unit, providing a classic look with zero maintenance.

The Andersen Story: A Century of Firsts

In 1608, a year after Jamestown was established, European craftsmen built America’s first glasshouse in Virginia. It was the very first industrial manufacturing effort in American colonial history. Nearly 300 years later, a Danish immigrant’s son named Hans Jacob Andersen transformed that industrial heritage.

Andersen opened the Andersen Lumber Company in Hudson, Wisconsin, in 1903. He noticed that carpenters spent hours cutting window frames by hand from raw lumber, creating chronic air and moisture gaps. He decided to standardize the process at the factory.

Andersen Milestones

•       1905: Introduced the “two-bundle” method, packaging standardized frame components into kits that reduced installation time from a full day to ten minutes.

•       1930: Released the Master Frame Casement Window—the industry’s first complete factory-assembled window unit.

•       1952: Developed welded insulating glass, offering factory-sealed double-pane units decades ahead of the general market.

•       1966: Launched the Perma-Shield system, wrapping wood windows in a protective vinyl exterior cladding that eliminated painting and scraping.

•       1983: Became the first major manufacturer to employ Low-E glass as a standard technology.

•       1991: Patented Fibrex, a composite material made of reclaimed wood fiber and thermoplastic polymer that offers superior strength and thermal stability compared to vinyl or wood alone.

Float Glass, Low-E, and the Thermal Revolution

In 1959, Sir Alastair Pilkington revolutionized manufacturing with the float glass process. Molten glass was poured onto a bath of liquid tin, allowing gravity to level it to perfect flatness while nitrogen polished the surface. This eliminated all optical distortion and made floor-to-ceiling windows and sliding glass doors commercially viable.

When the 1973 oil embargo sent energy costs soaring, single-pane windows were exposed as massive thermal liabilities. Double-pane insulated glass units (IGUs) quickly became mainstream.

The next major leap came with Low-E (low-emissivity) coatings—microscopically thin layers of silver applied to the glass surface. These coatings block infrared heat energy while letting visible light pass through.

Two Performance Numbers to Know

•       Solar Heat Gain Coefficient (SHGC): Measures how much solar heat passes through the window (scaled 0 to 1). Lower numbers mean less heat enters your home. In the hot, humid climates of Alabama and Florida, a low SHGC is critical for reducing air conditioning costs.

•       U-Factor: Measures the rate of non-solar heat transfer through the window assembly. Lower numbers indicate better insulation. A single-pane window typically scores a poor 1.0, while a high-performance double-pane unit lands at 0.27 or below.

Laminated Glass — From Accident to Law

In 1903, French chemist Edouard Benedictus accidentally dropped a glass flask coated with cellulose nitrate. It shattered, but the clear plastic film held the fragments together. He patented laminated glass in 1909.

Residential architecture ignored the technology until August 24, 1992, when Hurricane Andrew struck South Florida with 165 mph winds. Forensic engineers discovered that when standard windows broke, wind pressurized homes from the inside, lifting roofs off walls and causing total structural collapse.

Florida subsequently rewrote its building code, pioneering the Wind-Borne Debris Region (WBDR) standards.

Florida’s Impact Standards

The Florida Building Code mandates impact-rated openings or approved storm shutter systems in areas vulnerable to hurricane-force winds. This includes locations within one mile of the coast where wind speeds reach 130 mph, or any inland area facing 140 mph winds or higher.

To achieve an impact rating, a window must survive the “large missile test”—withstanding a 9-pound 2x4 timber fired at 50 feet per second—and then endure 9,000 positive and negative pressure cycles without a breach.

ENERGY STAR® Certification

Launched in 1996 by the EPA and the Department of Energy, the ENERGY STAR program established a rigorous, independent certification process for residential windows.

Under the current Version 7.0 standards, windows in the Southern Zone (covering Florida and coastal Alabama) must hit a U-factor at or below 0.32 and an SHGC at or below 0.23. Upgrading from old single-pane windows to ENERGY STAR certified models saves homeowners an average of 6% to 13% on annual utility costs, directly addressing the single largest point of thermal loss in a standard residential structure.

Premium Brands Offered by TruBlu

To deliver these engineering advancements to your home, TruBlu partners with North

America’s leading window manufacturers:

Andersen Windows

Pioneers of standardized frames, Perma-Shield vinyl cladding, and Fibrex composite materials.

Historic matching, premium wood interiors, and structural longevity.

Simonton Windows

Early pioneers of all-vinyl construction; backed by the Good Housekeeping Seal.

Low-maintenance vinyl performance and high visible light transmittance.

ProVia Windows

Engineered in Ohio’s Amish country; built with structural reinforcement and a lifetime warranty.

Custom sizes, professional-grade durability, and exceptional weatherstripping seals.

NT Window

A premier southern manufacturer; first to introduce Cardinal Low-E³-366 glass as a standard offering.

Maximizing heat rejection and fading protection in intense Southern climates.

Modern replacement windows are precision-engineered thermal barriers. By combining centuries of glassmaking history with advanced metallurgy and structural plastics, they frame your view of the world while sealing your home against the elements.

TruBlu High Performance Home

Replacement Windows • Doors • Patio Enclosures

Full Service: Measurements to Disposal • Serving Alabama and Florida

info@trublupros.com